JP2003123062A - Mobile communication terminal having color image display function and display control module thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable display colors of a moving image and a still image to be changed as necessary, thereby enabling a color image display with high uniformity of display colors and natural feeling. SOLUTION: A plurality of color difference conversion tables 52 storing different conversion information are provided, and one of the color difference conversion tables is selected according to a user's display color adjustment operation to convert a color difference signal of moving image data. The moving image display conversion unit 53 converts the converted color difference signal into RGB values,
34. For still image data, a plurality of look-up tables 56 in which different conversion information is stored are provided, and one of these look-up tables is selected according to a user's display color adjustment operation. The RGB values corresponding to the display color numbers of the stored still image data are read from the selected look-up table, and the RGB values are read from the LCD 3.
4 is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal represented by, for example, a mobile phone, and more particularly to a mobile communication terminal having a display function of color image data and its display control module.

[0002]

2. Description of the Related Art In recent years, mobile phones and PDAs (Personal D
Among mobile communication terminals typified by igital Assistants), an increasing number of terminals have a function of displaying color image data using a color liquid crystal display. When a terminal equipped with this type of function is used, for example, it displays the color moving image data transmitted from the communication partner terminal during a videophone communication, or a still image for mail created in the own terminal or the communication partner terminal. The data can be displayed, which is very convenient.

[0003]

However, cameras and liquid crystal displays generally used in mobile communication terminals have a large individual difference in optical performance as compared with those used in digital cameras and personal computers. Therefore, the display color changes for each received color image data or created color image data, and a stable color tone cannot be obtained. In particular, the color characteristics of the color moving image data captured by the camera and the color still image data created using an animation image or the like in the terminal are significantly different. Therefore, if the same color processing is applied to the moving image data and the still image data and displayed,
For example, a moving image has a display color that is biased toward green, while a still image has a display color that is biased toward blue. For example, the display color characteristics tend to be non-uniform and unnatural.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to change the display color of a display image as needed so that the display color is highly uniform and natural. It is an object to provide a mobile communication terminal and a display control module for the mobile communication terminal capable of displaying certain color images.

[0005]

To achieve the above object, a first invention is a conversion for converting a color difference signal of color moving image data from a first value to a second value according to a predetermined conversion rule. A storage unit for storing information and a color difference conversion unit are newly provided, and a color difference signal of the color moving image data input by the image input unit is converted into a first value based on the conversion information stored in the storage unit. Is converted to a second value, and the converted color difference signal is converted into a primary color signal for display.

Therefore, according to the present invention, even when the display color characteristic of the color moving image data is biased due to the influence of the optical characteristic of the camera or the liquid crystal display, for example,
By the conversion processing of the color difference signal, it is possible to correct the display color characteristic and display it. Therefore, it is possible to eliminate the influence of individual differences in the optical characteristics of the camera and the liquid crystal display, and always display with an appropriate display color characteristic.

The following configuration can be considered as a specific example of the color difference conversion processing. That is, in the first configuration, the storage means stores a plurality of pieces of conversion information having different conversion rules.
Then, in the color difference conversion means, one desired conversion information is selected from the plurality of conversion information stored in the storage means, and the color difference signal of the color moving image data input by the image input means is selected as described above. The first value is converted into the second value based on the conversion information.

With such a configuration, for example, when the user performs an operation of adjusting the display color during the videophone communication,
In response to this operation, one piece of conversion information is selected from the plurality of pieces of conversion information, and the display color of the received color moving image data is adjusted according to the selected conversion characteristic. Therefore, regardless of the display color characteristic of the color moving image data, the moving image data can always be displayed in the optimum display color.

The second configuration includes conversion information change control means, which changes the conversion information stored in the storage means from the first conversion rule information to the second conversion rule information. It is configured to do.

According to this structure, it is possible to variably set the conversion information stored in the storage means to the optimum value in response to the display color adjustment operation by the user. Therefore, according to this configuration, the received moving image data can be displayed in the optimum display color as needed. In addition, since one piece of conversion information may be stored in the storage means, there is an advantage that a large-capacity memory is unnecessary and the circuit configuration can be downsized and the cost can be reduced accordingly.

According to the third configuration, whether or not the conversion by the color difference conversion means is necessary is determined, and when the conversion is not necessary, the color difference signal of the color moving image data input by the image input means is converted into the color difference conversion means. Is input to the display conversion means without being converted. With such a configuration, when it is not necessary to correct the display color of the color moving image data, for example, the user inputs an instruction to that effect, and the color difference conversion is omitted and the display is provided as it is. It becomes possible.

Next, in order to achieve the above object, a second aspect of the present invention is a storage means for storing conversion information for converting a plurality of display colors into primary color signals in accordance with a predetermined conversion rule, and a color to be displayed. A storage unit for storing the display color of each pixel of the still image data and a display conversion unit are provided. Then, in this display conversion means, the display color of each pixel of the color still image data stored in the storage means is converted into a primary color signal based on the conversion information stored in the storage means,
This primary color signal is provided for display.

Therefore, according to the present invention, even if the created color still image data has a bias of the display color characteristic, the conversion characteristic including the correction component of this bias is stored in the storage means, thereby When the display color of each pixel of the still image data is converted into the primary color signal, it is possible to correct the bias of the display color characteristics of the color still image data. Therefore, it is possible to always display the color still image data with appropriate display color characteristics.

The following configuration can be considered as a specific example of the display color conversion processing. That is, in the first configuration, the storage means stores a plurality of pieces of conversion information having different conversion rules. Then, in the display conversion means, one desired conversion information is selected from the plurality of conversion information stored in the storage means, and the display color of each pixel of the color still image data stored in the storage means is set to the above-mentioned. The primary color signal is converted based on the selected conversion information.

With such a configuration, no matter what the display color characteristic of the color still image data to be displayed is, for example, when the user performs a display color adjustment operation, the above-mentioned plurality of colors are responded to in response to this operation. One of the corresponding conversion characteristics is selected, and the conversion processing to the primary color signal is performed according to the selected characteristics. Therefore, it is possible to always display the color still image data in the optimum display color.

The second configuration is provided with conversion information changing means, and the conversion means changes the conversion information stored in the storage means from the first conversion rule information to the second conversion rule information. It is configured in.

With such a configuration, it is possible to variably set the conversion information stored in the storage means to an optimum value in response to the display color adjustment operation by the user, for example.
Therefore, it is possible to display still image data in an optimum display color as needed. In addition, since one piece of conversion information may be stored in the storage means, there is an advantage that a large-capacity memory is unnecessary and the circuit configuration can be downsized and the cost can be reduced accordingly.

As a concrete example of the second configuration,
The primary color signal corresponding to the display color to be changed is read from the storage means, the read primary color signal is once converted into a color difference signal, and the converted color difference signal is converted into a first color difference signal based on the color difference signal conversion information. Convert the value to the second value. Then, it is conceivable that the converted color difference signal is reconverted into a primary color signal, and the read primary color signal of the conversion information stored in the storage means is rewritten to the reconverted primary color signal.

Generally, when the display color is changed, it is easier to change the value of the primary color signal on the color difference signal than to change it directly. Therefore, if the primary color signal is once converted into a color difference signal and its value is changed and then the color difference signal is reconverted into the primary color signal and the storage means is rewritten as in the above-described configuration, a relatively simple process is performed. The conversion information can be changed with.

In order to achieve the above-mentioned object, a third aspect of the present invention comprises a method for combining color moving image data and color still image data and displaying the combined color moving image data according to a predetermined conversion rule. A first storage unit that stores conversion information for converting a value of 1 to a second value and a color difference conversion unit of moving image data are provided, and in this color difference conversion unit, the input color moving image data The color difference signal is converted from the first value to the second value based on the conversion information stored in the first storage means. Along with that, a second storage unit that stores conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule, and a display of a plurality of pixels that form one frame of color still image data are displayed. A storage unit that stores the display color of the first pixel that is the target, and a first display conversion unit that stores information that indicates the insertion position of the moving image for the second pixel that is not the display target;
Second display conversion means. When the pixel information read from the storage means is a display color, the first display conversion means converts the read display color into the conversion information stored in the second storage means. Is converted into a primary color signal, and the converted primary color signal is displayed. On the other hand, when the pixel information read from the storage means is the information indicating the insertion position of the moving image, the second display conversion means causes the plurality of pixels constituting the color moving image data to be displayed. The color difference signal of the pixel corresponding to the read pixel is converted into the primary color signal by the color difference converting means, and the converted primary color signal is used for display.

Therefore, according to the present invention, even when the color moving image data and the color still image data are combined and displayed on the display, the correction of the display color is separately performed for the color moving image data and the color still image data. It is possible to perform processing, which makes it possible to display moving images and still images in appropriate display colors without affecting each other.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external configuration diagram of a mobile phone terminal which is an embodiment of a mobile communication terminal according to the present invention.

In addition to the voice communication function, this mobile phone terminal has a multimedia communication function such as television telephone communication, a mail transmission / reception function, a Web browsing function, a telephone directory function,
It has an electronic notebook function, and its front panel has a speaker 32 as a receiver and a liquid crystal display (LCD) 3
4, the key input unit 35 and the microphone 3 as a transmitter
1 is provided. An extendable antenna 11 and a camera 33 are attached to the upper part of the housing. The camera 33 employs a solid-state image sensor such as a CMOS or CCD and can capture a still image or a moving image. Further, a mounting portion for the power supply portion is provided on the back surface of the housing, and the power supply portion constituting the battery pack is detachably mounted on this mounting portion.

The key input section 35 is a dial key 35.
1 and a function key group 352. Of these, the function key group 352 includes a multi-contact type key 353 called a multi-function key, a photographing key 354 of the camera 33, and the like, in addition to a function key for sending and receiving and a clear key.

On the other hand, the circuit of the mobile phone terminal is constructed as follows. FIG. 2 is a circuit block diagram showing the configuration. This mobile phone terminal includes a wireless unit 1, a baseband unit 2, an input / output unit 3, and a power supply unit 4.

In FIG. 1, a radio frequency signal arriving from a base station (not shown) via a radio channel is an antenna 1
After being received at 1, the signal is input to the receiving circuit (RX) 13 via the antenna duplexer (DUP) 12. Receiver circuit 13
Comprises a high frequency amplifier, a frequency converter and a demodulator.
Then, the radio signal is low-noise amplified by a low-noise amplifier, and then a frequency synthesizer (SY) is used in a frequency converter.
N) The frequency is converted to a reception intermediate frequency signal or a reception baseband signal by mixing with the reception local oscillation signal generated from N) 14, and the output signal is digitally demodulated by a demodulator. As the demodulation method, for example, an orthogonal demodulation method corresponding to the QPSK method and a spectrum despreading method using a spread code are used. The frequency synthesizer 1 described above
The frequency of the received local oscillation signal generated from the signal No. 4 is designated by the main controller 21 provided in the baseband unit 2.

The demodulated packet output from the demodulator is input to the baseband unit 2. The baseband part 2 is
The main control unit 21, the demultiplexing unit 22, the audio code decoding unit (hereinafter referred to as an audio signal processing module) 23, the multimedia processing unit 24, the LCD control unit 25, and the memory unit 26 are provided. .

The demodulated packet is supplied from the main controller 21 to the demultiplexer 22. The demultiplexing unit 22 is, for example,
Performs demultiplexing processing of packets called MUX-PDU defined by ITUT H.223. That is, at the time of reception, the audio data, the image data, and the control data included in the demodulated packet are separated according to the contents of the header. Of these, the audio data is supplied to the audio signal processing module 23, for example, AM
It is decoded by a voice code decoding system such as R (Adaptive Multi Rate) system. The digital audio signal expanded by this decoding process is converted into an analog audio signal by a digital / analog converter (not shown) (hereinafter referred to as a D / A converter), and then the speaker 32 of the input / output unit 3 outputs a loud voice. Is output.

On the other hand, the image data is supplied to the multimedia processing unit 24 where it is subjected to image decoding processing. The image encoding / decoding method is, for example, MPEG-4 (Moving Picture E
xperts Group 4) is used. The image signal expanded by the decoding process is input to the LCD control unit 25, subjected to display color conversion processing to be described later in the LCD control unit 25, and then supplied to the LCD 34 of the input / output unit 3 for display.

The LCD control unit 25 is the main control unit 21.
LC output of still image data, phonebook data, transmission / reception history data, various information indicating the operating status of the terminal, etc.
It also has a function for displaying on D34. The information indicating the operating state of the own terminal includes, for example, information indicating reception quality and information indicating the remaining battery level.

On the other hand, the transmitted voice signal of the user output from the microphone 31 of the input / output unit 3 is the baseband unit 2
Is input to the audio signal processing module 23 of the
It is input to the demultiplexing unit 22 after being voice encoded by the method. The image signal output from the camera (CAM) 33 is used as the multimedia processing unit 24 of the baseband unit 2.
Is input to the demultiplexing unit 22 after being subjected to image coding processing according to MPEG-4. Demultiplexer 22
Is a transmission packet (MUX-PD) in which the encoded audio data and image data and control data generated by a data communication unit (not shown) are multiplexed according to ITUT H.223.
U) create. The transmission packet created by the demultiplexing unit 22 is transmitted from the main control unit 21 to the transmission circuit (T
X) 15 is input.

The transmission circuit 15 comprises a modulator, a frequency converter and a transmission power amplifier. The transmission data is digitally modulated by a modulator and then mixed by a frequency converter with a transmission local oscillation signal generated from the frequency synthesizer 14 to be frequency-converted into a radio frequency signal. As a modulation method, a QPSK method and a spread spectrum method using a spread code are used. Then, the generated transmission radio frequency signal is amplified to a predetermined transmission level by the transmission power amplifier, and then supplied to the antenna 11 via the antenna duplexer 12 and transmitted from the antenna 11 to a base station (not shown). To be done.

The power supply unit 4 includes a battery 41 such as a lithium-ion battery, and a charging circuit 42 for charging the battery 41 based on the commercial power output (AC100V).
And a voltage generation circuit (PS) 43. The voltage generation circuit 43 is composed of, for example, a DC / DC converter, and based on the output voltage of the battery 41, a predetermined power supply voltage V
Generate cc.

The input / output section 3 is provided with an illuminator 36 for illuminating the LCD 34 and the key input section 35 during operation and communication. The illuminator 36 is called, for example, a backlight or an illumination.

By the way, the LCD control unit 25 according to this embodiment is constructed as follows. FIG. 3 is a circuit block diagram showing the configuration. That is, the LCD control unit 25
Is a moving image display system circuit, a still image display system circuit,
And an output control circuit.

The circuit of the moving image display system includes a changeover switch 51.
A color difference conversion unit 52 and a moving image display conversion unit 53. On the other hand, the circuit of the still image display system has a frame memory 55 for displaying still image data, a look-up table unit 56, and a still image display conversion unit 57. The output control circuit includes an output changeover switch 54.

First, the color difference conversion unit 52 of the circuit of the moving image display system.
Has a plurality of color difference conversion tables. These color difference conversion tables store the values of the color difference signals (Y'Cb'Cr ') including the correction or variable component of the display color corresponding to each of the plurality of color difference signals (YCbCr) that are expected to be input. The stored value of the color difference signal (Y'Cb'Cr ') is set according to a conversion rule that differs for each table. One of these color difference conversion tables is selected by a selection control signal TS1 provided from a main control unit 21 described later. The color difference conversion unit 52 uses the multimedia processing unit 24.
Color difference signal (YCbCr) of moving image data output from
Are converted into different color difference signals (Y'Cb'Cr ') by referring to one selected from the plurality of color difference conversion tables.

The moving image display conversion unit 53 is the color difference conversion unit 5 described above.
The color difference signal (Y'Cb'Cr ') converted by 2 is converted into a primary color value (RGB) by, for example, an arithmetic operation, and the converted RGB value is output to the LCD 34.

The change-over switch 51 supplies the color difference signal output from the multimedia processing section 24 to the moving image display conversion section 53 while bypassing the color difference conversion section 52 when it is not necessary to convert the color difference signal. The main control unit 21
It operates by the switching control signal SW1 given from

On the other hand, the frame memory 55 of the circuit of the still image display system stores one frame of still image data output from the main controller 21. The content of the data stored at this time is the display color number of each pixel.

The look-up table section 56 includes a plurality of look-up tables. These lookup tables store primary color values (RGB) including display color correction or variable components corresponding to each of a plurality of display colors (for example, 256 colors), and the RGB values are stored for each table. It is set by different conversion rules. One of these look-up tables is selected by a selection control signal TS2 provided from the main control unit 21 described later.

The still image display conversion unit 57 reads the display color from one look-up table selected from the plurality of look-up tables each time the display color number of one pixel is read from the frame memory 55. The corrected or varied RGB value corresponding to the number is read. Then, the read RGB values are output to the output selector switch 54.
Output to the LCD 34 via.

The output changeover switch 54 is switched to the moving image display conversion unit 53 during the moving image display period and to the still image display conversion unit 57 during the still image display period in accordance with the switching control signal SW2 given from the main control unit 21. .

The main controller 21 is a microprocessor, R
With internal memory consisting of OM and RAM,
In addition to ordinary control functions such as connection control of wireless channels and communication control after establishment of communication links, a moving image display color control function 21a, a still image display color control function 21b, and a composite function are provided as control functions according to the present invention. Image display color control function 21c
It has and.

The moving image display color control function 21a monitors the display color adjusting operation on the key input unit 35 before the start of displaying the moving image or during the display period. When the display color adjusting operation is performed, the LCD control unit 25 is operated according to the operation information.
A selection control signal TS1 is output in response to this, and thereby one of the plurality of color difference conversion tables is selected and designated.

The still image display color control function 21b monitors the display color adjustment operation on the key input unit 35 before the start of displaying the still image or during the display period. When the display color adjustment operation is performed, the selection control signal TS2 is output to the LCD control unit 25 in accordance with the operation information, thereby selecting and designating one of the look-up tables.

The composite image display color control function 21c monitors a moving image display color adjusting operation and a still image display color adjusting operation in the key input unit 35, respectively. When the moving image display color adjustment operation is performed, L is adjusted according to the operation information.
The selection control signal TS1 is output to the CD control unit 25, whereby one of the plurality of color difference conversion tables is selected and designated. On the other hand, when the adjustment operation of the still image display color is performed,
A selection control signal TS2 is output to the LCD control unit 25 in accordance with the operation information, and thereby one of the look-up tables is selected and designated.

Next, a display operation of image data by the portable telephone terminal configured as described above will be described.

(1) Display of moving image data Here, a case where the videophone communication is performed with the partner terminal will be described as an example.

Prior to communication, the main control section 21 outputs a switching control signal SW2 to the LCD control section 25 for selecting a circuit of the moving image display system. Therefore, the LCD control unit 2
The output changeover switch 54 of No. 5 is set on the moving image display conversion unit 53 side. At the same time, the main control unit 21 outputs to the LCD control unit 25 a switching control signal SW1 for setting an initial display state in which the display color is not corrected. Therefore, the changeover switch 51 is set on the side bypassing the color difference conversion unit 52.

In this state, when the moving image data picked up by the camera of the other terminal is received and this moving image data is input from the multimedia processing section 24 to the LCD control section 25, this moving image data is subjected to color difference conversion. The data is input to the moving image display conversion unit 53, bypassing the unit 52. Then, after being converted into RGB values by calculation in the moving image display conversion section 53, it is supplied to the LCD 34 via the output changeover switch 54 and displayed. That is, at the beginning of communication, the received moving image data is displayed in the same display color without color difference conversion.
Displayed at D34.

Now, in this state, the user operates the key input unit 3
It is assumed that the display color adjustment operation is performed in 5. Then, the main control unit 21 outputs the switching control signal SW1 to the LCD control unit 25, whereby the changeover switch 51 is switched to the color difference conversion unit 52. Also, from the main control unit 21 to L
The selection control signal TS1 for changing the display color according to the adjusting operation is given to the CD control unit 25. Therefore, in the LCD control section 25, the selection control signal TS1
According to the above, one designated from the plurality of color difference conversion tables in the color difference conversion unit 52 is selected. Therefore, the color difference signal (YCbCr) of the moving image data output from the multimedia processing unit 24 is converted into the color difference signal (Y'C according to the selected color difference conversion table in the color difference conversion unit 52.
b'Cr ').

For example, it is assumed that the conversion information of the currently selected color difference conversion table has the contents shown in FIG. 4, and the color difference signal YCbCr = (3,253,2) is input in this state. Then, this input YCbCr =
The values of (3,253,2) are Y'Cb'Cr '=
Converted to (2,251,1). Note that FIG. 4 shows a state when converting Cb.

The color difference signal Y'Cb'C thus converted
r ′ = (2,251,1) is followed by the moving image display conversion unit 5
In 3 the calculation is converted into RGB values. An example of the conversion formula at this time is shown. R = 1.164384 (Y'-16) +1.596074 (Cr'-128) G = 1.164383 (Y'-16) -0.391764 (Cb'-128) -0.8
12967 (Cr'-128) B = 1.164383 (Y'-16) +2.017232 (Cb'-128) Actually, since the above conversion operation is performed by the digital operation in the LCD control unit 25, the following conversion operation is performed. An expression is used. R = {(128 + 16 + 4 + 1) Y '+ (128 + 16 + 4) Cr'-28496} / 128 G = {(128 + 16 + 4 + 1) Y'-(32 + 16 + 2 ) Cb '-(64 + 32 + 8) Cr' + 17328} / 128 B = {(128 + 16 + 4 + 1) Y '+ (256 + 2) Cb'-35408} / 128 In the above example, Y , Cb, and Cr are 8-bit data, respectively. However, each LCD 34 has 6
When displaying an RGB value consisting of bits, in order to convert the 8-bit RGB value calculated by the above arithmetic expression into 6 bits, this 8-bit RGB value is shifted by 2 bits (divided by 4), Round the result and clip to 0-63.

The RGB values obtained by the moving image display conversion section 53 are displayed on the LCD 3 via the output changeover switch 54.
4 is supplied and displayed. Therefore, after that, the LCD 34
A color moving image whose display color is corrected according to the user's display color adjustment operation is displayed on.

When the display color is adjusted as described above and then returned to the initial state where the display color is not corrected, the user performs a cancel operation of the display color correction on the key input unit 35. Then, from the main control unit 21 to LC
The switching control signal SW1 is output to the D control unit 25, which causes the changeover switch 51 to switch from the color difference conversion unit 52 to the moving image display conversion unit 53. Therefore, the moving image data that is input thereafter is bypassed by the color difference conversion unit 52 and input to the moving image display conversion unit 53, and as a result, the received moving image that is not subjected to color correction is displayed on the LCD 34.

As another configuration for displaying a moving image whose display color has not been corrected, conversion information which does not change between input data and output data is stored as shown in FIG. 5, for example. Prepare a color difference conversion table for non-conversion. Then, the non-conversion color difference conversion table may be selected in response to the user's cancel operation of the display color correction.

Each structure for displaying the moving image whose display color is not corrected is used when it is not necessary to correct the display color of the received moving image data.

(2) When displaying still image data When the user specifies the still image display mode, the main controller 2
1 outputs a switching control signal SW2 for selecting a circuit of a still image display system to the LCD control unit 25. Therefore, the output changeover switch 54 is set on the still image display conversion unit 57 side. Further, the main controller 21 gives the LCD controller 25 a selection control signal TS2 for selecting a predetermined lookup table as a table for the initial state. Therefore, in the lookup table unit 56,
For example, a look-up table that stores RGB values of standard display colors that do not include correction components is selected.

The still image data is stored in, for example, the memory unit 26, and when the user selects the still image data to be displayed, the still image data is read from the memory unit 26 and the frame memory of the LCD control unit 25. 55
Written in. The data written in the frame memory 55 at this time is data representing the display color number for each pixel.

When one frame of still image data is stored in the frame memory 55, the still image display conversion unit 57 reads the display color number of each pixel from the frame memory 55 and corresponds to the read display color number. RGB
The value is read from the selected look-up table in the look-up table section 56. Then, the read RGB values are output to the LCD via the output selector switch 54.
Supply to 34. Therefore, on the LCD 34, an image of a color designated by the RGB value is displayed for each pixel.

In this state, the user inputs the key input section 3
It is assumed that the display color adjustment operation is performed in 5. Then, the main control unit 21 sends to the LCD control unit 25 a selection control signal T for changing the display color according to the adjustment operation.
S2 is given. Therefore, the LCD control unit 25 selects one designated from the plurality of look-up tables in the look-up table unit 56 according to the selection control signal TS2. Therefore, thereafter, the corrected RGB values are read from the newly selected look-up table, and the RGB values are supplied to the LCD 34 and displayed. Therefore, a still image whose display color is corrected is displayed on the LCD 34.

For example, it is assumed that still image data is represented by 255 colors. In this case, 1 to 255 for 255 colors
Are assigned to these color numbers, and their RGB values are determined in association with these color numbers. The RGB value includes a correction component or a variable component of the display color. Then, information indicating the correspondence between the color numbers 1 to 255 and the RGB values is stored in the lookup table. On the other hand, the frame memory 55 stores the color numbers assigned to the above 255 colors for each pixel of the still image data to be displayed.

Therefore, for example, a look-up table storing conversion information as shown in FIG. 6 is selected, and the frame memory 55 stores the color number of still image data as shown in FIG. It is assumed that the first pixel (pixel located on the upper left) in the memory 55 is read.

Then, the color number of this pixel is "00".
5 ”, the RGB value (00,00,63) corresponding to this color number“ 005 ”is obtained from the lookup table.
Is read. Since this RGB value (00, 00, 63) represents “blue”, the color of the upper left pixel of the still image displayed on the LCD 34 is blue. The same applies to the other pixels.

Even if the pixel having the same color number "005" is selected, this display color is another color represented by the RGB values stored in this table when another lookup table is selected. . That is, the display color of the still image can be corrected or changed to a desired color by arbitrarily selecting the lookup table.

It is expected that the still image data to be displayed may include color data other than the above 255 colors. In this case, for example, in the main control unit 21, the color data other than the above 255 colors is approximated to the most similar color among the above 255 colors based on the correspondence table prepared in advance, and its number is set to the frame. It may be written in the memory 55.

(3) Display of Composite Image Data of Still Image Data and Moving Image Data Here, a case where the moving image is fitted to a specific portion of the still image will be described as an example. When displaying such a composite image, the main control unit 21 reads out still image data specified by the user from the memory unit 26, and displays the display color number for each pixel of the display target portion of the read out still image data. On the other hand, a specific number which is not used as a display color number is assigned to a portion into which a moving image is fitted. Then, the still image data for synthesis thus created is written in the frame memory 55 in the LCD control unit 25. FIG. 7 shows an example thereof, and a hatched portion in the drawing is a portion into which a moving image is fitted, and a specific number “000” is assigned to this portion.

When one frame of still image data is written in the frame memory 55, the still image display conversion unit 57 sequentially reads pixel data of the still image data, that is, the display color number or the specific number from the frame memory 55. . Then, with reference to the selected lookup table 56, the RGB value corresponding to the display color number or the specific number is read out. At this time, in the lookup table 56, as shown in FIG. 7, the display color numbers “001” to “25” are displayed.
The RGB value is stored in “5”, but the specific number “00
RGB values are not stored in "0". Therefore, the RGB value is read for the pixel whose display color number has been read, but the value corresponding to colorless is read for the pixel whose specific number “000” has been read.

Further, in synchronization with the read operation of the still image data, the output changeover switch 54 follows the switching control of the main control section 21 and causes the still image display conversion section 57 to display during the read period of the display target portion of the still image data. On the other hand, it is connected to the moving image display conversion unit 53 during the read-out period of the moving image fitting part of the still image data. Therefore, during the read period of the display target portion of the still image data, the RGB value read from the still image display conversion unit 57 is LC as it is.
On the other hand, the RGB values of the moving image data read from the moving image display conversion unit 53 are selected and supplied to the LCD 34 during the reading period of the moving image fitting portion of the still image data. To be done.

Regarding the moving image data, the RGB values converted by the color difference conversion unit 52 and the moving image display conversion unit 53 are the same as in the case described above in "(1) Displaying moving image data". Is output.

Thus, the LCD 34 displays the composite image in which the moving image is fitted to the specific portion of the still image. Figure 7
In the above, an example is shown in which a moving image represented by a diagonal grid is fitted into a specific portion corresponding to "sky" in a still image. Although the moving image is shown by a hatched grid for convenience of illustration in the drawing, actually, the face image of the user and the image of the scenery captured by the camera 33 are fitted.

When adjusting the display color of the composite image, the user independently performs the display color adjusting operation for the still image portion and the display color adjusting operation for the moving image portion in the key input unit 35. Then, the corresponding lookup table is selected from the lookup table unit 56 by the selection control of the main control unit 21 in accordance with the display color adjustment operation for the still image portion, and the RGB values stored in the selected lookup table. Causes the display color of the still image part to change. In each lookup table, the area corresponding to the specific number “000” has RGB
The value is not stored.

On the other hand, the color difference conversion section 5 is controlled by the selection control of the main control section 21 according to the display color adjustment operation for the moving image part.
A corresponding color difference conversion table is selected from 2, and different color difference signals are output from the selected color difference conversion table. The output color difference signal is converted into RGB values by the moving image display conversion unit 53 and then supplied to the LCD 34 for display. Therefore, the display color of the moving image also changes according to the user's operation.

The display color adjustment for the still image portion and the display color adjustment for the moving image portion can be performed by a common operation. This can be realized by providing a simultaneous display color adjustment mode. For example, when the user performs a display color adjustment operation with the simultaneous adjustment mode specified, the main control unit 21 selects a lookup table and a color difference conversion table in accordance with the adjustment operation. Thus, the display color adjustment for the still image portion and the display color adjustment for the moving image portion can be performed at the same time.

As described above, in this embodiment, a plurality of color difference conversion tables in which different conversion information is stored are provided, and one of these color difference conversion tables is selected according to the display color adjustment operation of the user. The color difference signal of the moving image data is converted, the converted color difference signal is converted into RGB values, and L
It is displayed on the CD34. For still image data, a plurality of look-up tables in which different conversion information is stored are provided, and one of these look-up tables is selected according to the user's display color adjustment operation to display the still image data. The RGB value corresponding to the color number is read out, and this RGB value is displayed on the LCD 34. Furthermore, when displaying an image in which a still image and a moving image are combined, one of the color difference conversion tables and one of the look-up tables are selected according to different operations of the user, and each of the selected tables is selected. Display is performed by converting color difference signals of moving image data and converting display color numbers into RGB values.

Therefore, according to this embodiment, even if the display color is biased due to the individual difference in the optical characteristics of the camera 33 or the LCD 34 of the own terminal or the communication partner terminal, the display color is desired according to the adjustment operation by the user. The color can be corrected or changed.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a plurality of color difference conversion tables and a plurality of lookup tables are prepared, and the display color is corrected by selecting a corresponding table from these tables according to the user's display color adjustment operation. I made it variable. However, the present invention is not limited to this. For example, one color difference conversion table and one look-up table are prepared, and the conversion information stored in these tables is rewritten according to the display color adjustment operation of the user. Good.

FIG. 8 shows an operation example for realizing this, and shows a case where the conversion information of the lookup table is changed. That is, first, the RGB values of the look-up table are converted into the color difference signal YCbCr as shown in step 8a in the figure. Next, this color difference signal YCbCr
Is converted into a color difference signal Y'Cb'Cr 'as shown in step 8b by referring to the color difference conversion table of the color difference conversion unit 52. Then, the converted color difference signal Y'Cb'C
In the moving image display conversion unit 53, r'is inversely converted into an R'G'B 'value as shown in step 8c, and the conversion information of the look-up table is rewritten to the converted R'G'B' value.

The inverse conversion to the R'G'B 'value can be realized by the following mathematical formula. R '= {1.16438 (Y-16) +1.59603 (Cr-128)} + 0.5 G' = {1.16438 (Y-16) -0.39176 (Cb-128) -0.8129
7 (Cr-128)} + 0.5 B '= {1.16438 (Y-16) +2.01723 (Cb-128)} In this way, even if there is only one lookup table, the conversion information is rewritten. As a result, it is possible to correct or change the display color to a desired one. The advantage of this configuration is that the memory capacity can be significantly reduced because only one look-up table is required, and it is a relatively simple process compared to the case of directly converting RGB values by performing conversion processing on color difference signals. The point is that conversion can be performed. This configuration is applicable not only to the lookup table but also to the color difference conversion table.

In the above embodiment, the display color is corrected or changed using the color difference conversion table and the look-up table. However, a mathematical expression representing the conversion characteristic is stored and the weighting coefficient is multiplied according to this mathematical expression. The display color may be corrected or changed by performing the calculation. In this way, the display color conversion process takes longer than in the case of using the table, but by eliminating the table, the storage capacity of the memory can be significantly reduced.

Further, in the above-described embodiment, at the start of image display, the display color is not corrected by default for moving image data, and standard conversion information of color numbers and RGB values is stored for still image data. The lookup table is set as the default.
However, the color difference conversion table and the lookup table selected at the time of ending the image display are stored, and when the next image data is displayed, the stored table is selected as the initial state to start displaying the image data. You may do it. In this way, when displaying images received from the same communication partner successively, the user does not need to adjust the display color each time.

Further, in the above embodiment, the moving image data,
The case where the processing for correcting or varying the display color is performed for each of the still image data and its composite image data has been described, but for any one or two of the moving image data, the still image data and its composite image data. You may make it perform the process which correct | amends or changes a display color.

Further, in the above-described embodiment, the case where the received moving image data is displayed has been described as an example. However, when the moving image data captured by the camera 33 of the own terminal is displayed, the image is captured by the external digital camera. The same is applicable to the captured moving image data and the moving image data captured from an external source such as a personal computer or a memory card.

The still image data is not limited to the still image data stored in advance in the memory unit 26, but still image data captured by the camera 33 of the terminal itself, an external digital camera, a personal computer or a memory. The same can be applied to still image data captured from an external source such as a card.

Further, although the above embodiment has been described by taking a mobile telephone terminal as an example, the present invention is not limited to this and is also applicable to other mobile communication terminals such as PDA (Personal Digital Assistants) having a color image display function. In addition, the mobile communication terminal configuration, communication method, image encoding method, image data display color control procedure and its contents, type and size of the display device, etc. are variously modified without departing from the scope of the present invention. Can be implemented.

[0087]

As described above in detail, in the first aspect of the invention, the color difference signal of the color moving image data is converted into the first color difference signal according to a predetermined conversion rule.
The storage means for storing the conversion information for converting the value of 2 to the second value and the color difference conversion means are newly provided, and the color difference signal of the color moving image data input by the image input means is
The first value is converted into the second value based on the conversion information stored in the storage means, and the converted color difference signal is converted into the primary color signal for display.

In the second invention, storage means for storing conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule, and display for each pixel of color still image data to be displayed. A storage unit for storing the color and a display conversion unit are provided. Then, the display conversion means converts the display color of each pixel of the color still image data stored in the storage means into a primary color signal based on the conversion information stored in the storage means, and displays the primary color signal. I am offering it to.

Therefore, according to these inventions, it is possible to change the display color of these images, whether it is a color moving image or a color still image, if necessary.
As a result, it is possible to provide a mobile communication terminal and a display control module for the mobile communication terminal which can display a color image with a high uniformity of display colors and a natural appearance.

[Brief description of drawings]

FIG. 1 is an external configuration diagram of a mobile phone terminal which is an embodiment of a mobile communication terminal according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a mobile phone terminal which is an embodiment of a mobile communication terminal according to the present invention.

3 is a block diagram showing a circuit configuration of an LCD control unit of the mobile phone terminal shown in FIG.

FIG. 4 is a diagram for explaining an example of a color difference conversion operation in the color difference conversion unit shown in FIG.

5 is a diagram for explaining another example of the color difference conversion operation in the color difference conversion unit shown in FIG.

6A and 6B are views for explaining an example of a display color conversion operation by the circuit of the still image display system shown in FIG.

7 is a diagram for explaining an example of a display color conversion operation of a composite image by the circuits of the moving image display system and the still image display system shown in FIG.

FIG. 8 is a view for explaining an operation example when changing the storage contents of the lookup table shown in FIG.

[Explanation of symbols] 1 ... Wireless section 2 ... Baseband section 3 ... I / O section 4 ... Power supply 11 ... Antenna 12 ... Antenna duplexer (DPX) 13 ... Receiving circuit (RX) 14 ... Frequency synthesizer (SYN) 15 ... Transmission circuit (TX) 21 ... Main control unit 21a ... Moving image display color control function 21b ... Still image display color control function 21c ... Composite image display color control function 22 ... Demultiplexer 23 ... Audio signal processing module 24 ... Multimedia processing unit 25 ... LCD control unit 26 ... Memory unit 31 ... Microphone 32 ... speaker 33 ... Camera 34 ... Liquid crystal display (LCD) 35 ... Key input section 36 ... Illuminator 41 ... Battery 42 ... Charging circuit (CHG) 43 ... Voltage generation circuit (PS) 51 ... Changeover switch 52 ... Color difference converter 53 ... Moving image display converter 54 ... Output selector switch 55 ... Frame memory 56 ... Look-up table section 57 ... Still image display color conversion unit

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Claims (12)

[Claims] 1. An image input means for inputting color moving image data, and a memory storing conversion information for converting a color difference signal of the color moving image data from a first value to a second value according to a predetermined conversion rule. Means for converting the color difference signal of the color moving image data input by the image input means from the first value to the second value based on the conversion information stored in the storage means, A display conversion unit for converting the color difference signal converted by the color difference conversion unit into a primary color signal; and a display unit for displaying a color moving image based on the primary color signal converted by the display conversion unit. A mobile communication terminal equipped with a color image display function. 2. The storage means stores a plurality of conversion information having different conversion rules, and the color difference conversion means selects one desired conversion information from the plurality of conversion information stored in the storage means. And converting the color difference signal of the color moving image data input by the image input means from the first value to the second value based on the conversion information selected by the selection means. The mobile communication terminal according to claim 1, wherein 3. The conversion information stored in the storage means,
The mobile communication terminal according to claim 1, further comprising change control means for changing the information of the first conversion rule to the information of the second conversion rule. 4. A color difference signal of the color moving image data inputted by said image input means is converted by said color difference conversion means when it is judged whether or not conversion by said color difference conversion means is necessary. The mobile communication terminal according to claim 1, further comprising means for inputting to the display conversion means without the need. 5. Storage means for storing conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule, and storage for storing the display color for each pixel of color still image data to be displayed. Means for converting the display color of each pixel of the color still image data stored in the storage means into a primary color signal based on the conversion information stored in the storage means; A mobile communication terminal having a color image display function, comprising: a display unit for displaying a color still image based on the primary color signal. 6. The storage means stores a plurality of conversion information with different conversion rules, and the display conversion means selects one desired conversion information from the plurality of conversion information stored in the storage means. The display color of each pixel of the color still image data stored in the storage means is converted into a primary color signal based on the conversion information selected by the selection means. Item 5. A mobile communication terminal according to item 5. 7. The conversion information stored in the storage means,
6. The changing means for changing the information of the first conversion rule to the information of the second conversion rule is further provided.
The mobile communication terminal described. 8. The changing unit reads out a primary color signal corresponding to a display color to be changed from the storage unit, a unit for converting the primary color signal read out from the storage unit into a color difference signal, and a color still image. The color difference signal of the image data has conversion information for converting the first value to the second value, and the converted color difference signal is changed from the first value to the second value based on the conversion information. Conversion means, means for re-converting the color difference signal converted into the second value into a primary color signal, and conversion of the read primary color signal among the conversion information stored in the storage means into the re-conversion 8. The mobile communication terminal according to claim 7, further comprising means for rewriting to the primary color signal. 9. An image input unit for inputting color moving image data, and conversion information for storing a color difference signal of the color moving image data from a first value to a second value according to a predetermined conversion rule. No. 1 storage means, second storage means for storing conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule, and color difference signals of color moving image data input by the image input means. Of the color difference conversion means for converting the first value to the second value based on the conversion information stored in the first storage means, and a plurality of pixels constituting one frame of the color still image data. A storage unit that stores the display color of the first pixel that is the display target, and stores information that represents the insertion position of the moving image for the second pixel that is not the display target; Information of the pixels In the case of a display color, the read display color is converted into a primary color signal on the basis of the conversion information stored in the second storage means and is output, and the storage means is provided. When the information of the read pixel is the information indicating the insertion position of the moving image, the color difference conversion means converts the pixel corresponding to the read pixel among the plurality of pixels forming the color moving image data. Second display conversion means for converting the color difference signal after the conversion to a primary color signal and outputting the primary color signal; and a color still image and a color moving image based on the primary color signals output from the first and second conversion means. A mobile communication terminal having a color image display function, the mobile communication terminal having a display means for displaying an image obtained by combining and. 10. A display control module for displaying input color moving image data on a display device, storing conversion information for converting a color difference signal from a first value to a second value according to a predetermined conversion rule. Color difference conversion means having a color difference conversion table for converting the color difference signal of the input color moving image data from the first value to the second value based on the conversion information stored in the conversion table; A display control means for converting the color difference signal converted by the color difference conversion means into a primary color signal, and supplying the converted primary color signal to the display to display a color moving image. module. 11. A display control module for displaying color still image data on a display device, and storage means for storing conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule, and an attempt to display. A storage unit that stores the display color of each pixel of the color still image data, and a display color of each pixel of the color still image data stored in the storage unit based on the conversion information stored in the storage unit. A display control module comprising: a display conversion unit that converts the primary color signal and supplies the converted primary color signal to the display to display a color still image. 12. A display control module for synthesizing input color moving image data and color still image data and displaying the combined color still image data on a display device, wherein a color difference signal of the color moving image data is converted from a first value according to a predetermined conversion rule. First storage means for storing conversion information for converting into a second value; second storage means for storing conversion information for converting a plurality of display colors into primary color signals according to a predetermined conversion rule; Color difference conversion means for converting the color difference signal of the input color moving image data from the first value to the second value based on the conversion information stored in the first storage means; Of the plurality of pixels forming one frame of the color still image data, the display color of the first pixel to be displayed is saved and the second pixel not to be displayed is saved.
With respect to the pixel, the storage means for storing the information indicating the insertion position of the moving image, and when the information of the pixel read from the storage means is the display color, the read display color is stored in the second storage. First conversion means for converting the primary color signal based on the conversion information stored in the means, and supplying the converted primary color signal to the display to display a color still image; and reading from the storage means. When the information of the pixel that is output is the information that indicates the insertion position of the moving image, the color difference conversion unit converts the pixel corresponding to the read pixel among the plurality of pixels that form the color moving image data. A display control module for converting the color difference signal after the conversion to a primary color signal, and supplying the converted primary color signal to the display to display a color moving image. .