JP2005192134A - Digital broadcast receiver, digital broadcast recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain image quality as much as possible by reducing power consumption. <P>SOLUTION: In a digital broadcasting receiver 10 for receiving digital broadcasting data for displaying an image, a plurality of image processing circuits are provided at an image processing/display output section 32. A power supply section 16 determines which of an external power supply (AC) and a battery is a power supply source for notifying a CPU 20 via an I/O section 24. When it is determined that the power supply source is the battery, the CPU 20 selects an image processing circuit used for processing the image from a plurality of image processing circuits at the image processing/display output section 32, and a video decoding section 30 executes image processing to the decoded video data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiver that receives a digital television broadcast.

  Recent television receivers have achieved high image quality by executing processing using various image processing techniques such as contour correction, automatic contrast adjustment, γ correction, and I / P (interlace / progressive) conversion. . In particular, high resolution is realized in a digital television receiver that receives digital broadcast data.

  Conventional stationary television receivers usually use an AC power supply as a power supply source, so that high image quality can be achieved using the above-described advanced image processing technology without considering power consumption.

  On the other hand, battery-operated TV receivers are expected to be battery-powered. However, using such advanced image technology consumes a lot of power, shortening battery life and operating time. Will be shorter.

Conventionally, in a battery-driven device, a portable terminal device having a function of reducing power consumption has been considered (for example, Patent Document 1). The portable terminal device described in Patent Document 1 is used as a video conference terminal. When the remaining battery level becomes a certain value or less, transmission of image data is stopped and only audio data is transmitted. We are trying to reduce it.
JP-A-9-186981

  Like the device described in Patent Document 1, it is possible to reduce power consumption by stopping part of the function (transmission of image data). However, if an image is not displayed on a television receiver, It will not be able to play a role as a television receiver. Therefore, it is required to reduce power consumption while displaying an image.

  An object of the present invention is to provide a digital broadcast receiver and a digital broadcast recording apparatus that can maintain image quality as much as possible while reducing power consumption.

  According to a first aspect of the present invention, in a digital broadcast receiver that receives digital broadcast data and displays an image, a power source determination that determines which of a plurality of image processing circuits, an external power source, and a battery is a power supply source. And a selection unit that selects an image processing circuit to be used for image processing from the plurality of image processing circuits when the power supply source is determined to be the battery by the power source determination unit. And

  The invention according to claim 2 is a digital broadcast receiver that receives digital broadcast data and displays an image, a plurality of image processing circuits, a remaining amount detecting means for detecting a remaining amount of a battery as a power supply source, And selecting means for selecting an image processing circuit to be used for image processing from the plurality of image processing circuits in accordance with the remaining amount detected by the remaining amount detecting means.

  According to a third aspect of the present invention, in the second aspect of the present invention, the determination for determining a combination of predetermined image processing circuits among the plurality of image processing circuits according to the remaining amount detected by the remaining amount detecting means. And the selecting means selects an image processing circuit corresponding to the combination determined by the determining means.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, each combination when the plurality of image processing circuits are selectively combined according to the remaining amount detected by the remaining amount detecting means. Time calculation means for calculating a viewable time in the display, a selection screen display means for displaying a screen for selecting the available time calculated by the time calculation means, and an available time displayed by the selection screen display means An instruction input means for inputting an instruction to select the image processing circuit, wherein the selection means selects a combination of image processing circuits in accordance with an available time indicated by the instruction input by the instruction input means. To do.

  According to a fifth aspect of the present invention, in a digital broadcast recording apparatus that receives digital broadcast data and records an image, a power source determination that determines which of a plurality of image processing circuits, an external power source, and a battery is a power supply source And a selection means for selecting an image processing circuit to be used for image processing from the plurality of image processing circuits when the power supply source is determined to be the battery by the power supply determination means, and a selection by the selection means And image recording means for recording an image processed by the image processing circuit.

  The invention according to claim 6 is a digital broadcast recording apparatus for receiving digital broadcast data and recording an image, a plurality of image processing circuits, a remaining amount detecting means for detecting a remaining amount of a battery as a power supply source, In accordance with the remaining amount detected by the remaining amount detecting means, a selection means for selecting an image processing circuit to be used for image processing from the plurality of image processing circuits, and an image processing circuit selected by the selection means. And image recording means for recording the recorded image.

  According to the first aspect of the present invention, in order to receive digital broadcast data and display an image, it is determined which of the external power supply and the battery is a power supply source, and is determined that the power supply source is a battery. In such a case, by selecting an image processing circuit to be used for image processing, it is possible to maintain image quality as much as possible while reducing power consumption.

  According to the second aspect of the present invention, in order to receive digital broadcast data and display an image, the remaining amount of the battery serving as a power supply source is detected, and images from a plurality of image processing circuits are detected according to the remaining amount. By selecting an image processing circuit used for processing, it is possible to maintain image quality as much as possible while reducing power consumption.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, the combination of predetermined image processing circuits among the plurality of image processing circuits is determined according to the remaining amount of the battery. It is possible to maintain image quality as much as possible while reducing power consumption so that an expected viewable time corresponding to the remaining amount can be secured.

  According to the invention of claim 4, in addition to the effect of the invention of claim 2, viewing in each combination when a plurality of image processing circuits are selectively used in combination according to the remaining battery level is possible. By calculating the time and displaying a screen for selecting the calculated usable time and allowing the user to select it, the image quality desired by the user is maintained while reducing power consumption. It becomes possible.

  According to the fifth aspect of the invention, in order to receive digital broadcast data and record an image, it is determined which of the external power source and the battery is a power supply source, and is determined that the power supply source is a battery. In such a case, an image processing circuit to be used for image processing is selected, and an image processed by the selected image processing circuit is recorded, so that image quality is maintained as much as possible while reducing power consumption. Can be recorded.

  According to the sixth aspect of the present invention, in order to receive digital broadcast data and record an image, the remaining amount of a battery as a power supply source is detected, and an image is output from a plurality of image processing circuits according to the remaining amount. By selecting an image processing circuit to be used for processing and recording an image processed by the selected image processing circuit, it is possible to record while maintaining image quality as much as possible while reducing power consumption. It becomes.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a system configuration of a digital broadcast receiver 10 in the present embodiment. The digital broadcast receiver 10 includes a main body unit 12, an antenna 14, a power supply unit 16, and a display device 18. The main unit 12 includes a CPU 20, a main memory 21, a ROM 22, a flash memory 23, an I / O unit 24, a tuner 26, a demodulator 27, a decode unit 28, an audio decode unit 29, a video decode unit 30, an image processing / display output unit. 32 etc. are provided.

  The antenna 14 receives radio waves of digital broadcast data. The data is output to the tuner 26 of the main body 12.

  The power supply unit 16 receives a power supply necessary for the operation of the digital broadcast receiver 10. The power supply unit 16 can select and accept either an AC (alternating current) power source that is an external power source or a battery (battery) as a power supply source. The power supply unit 16 is provided with a switch (not shown) for detecting insertion of the AC adapter, and when the switch is turned on, it is determined that the power supply source is AC. When the switch is off, it is determined that the battery is a power supply source. The power supply unit 16 has a function of detecting the voltage of the battery, and can detect the voltage state of the battery as a power supply source, that is, the remaining battery level. The power supply source detected by the power supply unit 16 and the information indicating the battery voltage state in the case of state battery supply are notified to the CPU 20 by the I / O unit 24 of the main body unit 12 by interruption.

  The CPU 20 controls the entire digital broadcast receiver 10 and controls each unit by executing a program stored in the main memory 21. The CPU 20 selectively enables a plurality of image processing circuits constituting the image processing / display output unit 32 according to the power supply source and the voltage state notified from the I / O unit 24, thereby reducing the power consumption. A function of controlling so that image quality can be maintained as much as possible while realizing reduction is realized.

  The main memory 21 stores various programs executed by the CPU 20 and data.

  The ROM 22 and the flash memory 23 store various programs and data, and are accessed by the CPU 20.

  The I / O unit 24 notifies the CPU 20 of data indicating the power supply source and the power state detected by the power supply unit 16 by interrupt processing.

  The tuner 26 selects a signal of a desired channel designated by the user from the digital broadcast signal received by the antenna 14.

  The demodulator 27 digitizes (encodes) the signal selected by the tuner 26.

  The decoding unit 28 divides audio data and video data from the data digitized by the demodulation unit 27 and outputs them to the audio decoding unit 29 and the video decoding unit 30.

  The audio decoding unit 29 decodes the audio data obtained by the decoding unit 28 and outputs audio from an audio output device such as a speaker through an audio output terminal.

  The video decoding unit 30 decodes the video data obtained by the decoding unit 28 and outputs it to the image processing / display output unit 32.

  The image processing / display output unit 32 performs image processing using various image processing techniques on the video data decoded by the video decoding unit 30, and displays video (on the display device 18, for example, a liquid crystal display, through the video quality terminal. Image). The image processing / display output unit 32 is provided with a plurality of image processing circuits for executing image processing using various image processing techniques, and a specific image processing circuit (predetermined predetermined) selected by the control of the CPU 20. Only a combination of image processing circuits) can be operated.

FIG. 2 shows a detailed configuration of the image processing / display output unit 32.
As shown in FIG. 2, the image processing / display output unit 32 includes an input image storage unit 40, a scaling unit 41, an I / P conversion processing unit 42, an automatic contrast adjustment unit 43, an outline correction processing unit 44, and an output image storage unit. A plurality of image processing circuits such as 45, a frame memory 46, a two-dimensional processing unit 47, a three-dimensional processing unit 48, a motion adaptive processing unit 49, and a previous image frame memory 50 are provided. Each image processing circuit is realized by hardware, and power consumption can be reduced by stopping the operation. Note that the configuration of the image processing / display output unit 32 shown in FIG. 2 is an example, and may have a configuration for realizing other image processing methods.

  The input image storage unit 40 stores the image data decoded by the video decoding unit 30.

  The scaling unit 41 converts the display size by two-divided display or the like.

  The I / P conversion processing unit 42 converts interlaced video into progressive video.

  The contrast automatic adjustment unit 43 detects the luminance level and executes a process of assigning a large number of gradations to the luminance region with the largest video component.

  The contour correction processing unit 44 adjusts the color so as to be smooth in diagonal lines and curves.

  The output image storage unit 45 stores image data processed in each image processing unit.

  The frame memory 46 stores image data of an image frame to be processed.

  The two-dimensional processing unit 47 executes two-dimensional processing as an effective solution means in image processing by the scaling unit 41, the I / P conversion processing unit 42, the automatic contrast adjustment unit 43, and the contour correction processing unit 44. Processing with reference to neighboring pixels in one image such as up, down, left and right is performed.

  Similar to the two-dimensional processing unit 47, the three-dimensional processing unit 48 executes three-dimensional processing as an effective solution means in each image processing unit, and the previous image stored in the previous image frame memory 50 in addition to the two-dimensional processing. Execute the process referring to.

  Similar to the two-dimensional processing unit 47, the motion adaptive processing unit 49 executes motion adaptive processing as an effective solution means in each image processing unit, and is stored in the previous image frame memory 50 in addition to the three-dimensional processing. The process is executed while detecting the moving part with reference to the previous image.

  The previous image frame memory 50 stores image data of the previous image frame in order to execute processing in the three-dimensional processing unit 48 and the motion adaptive processing unit 49.

(First embodiment)
The operation of the digital broadcast receiver 10 in the first embodiment will be described.
In the first embodiment, each image processing unit constituting the image processing / display output unit 32 is selectively used depending on whether the power supply source is supplied through an external AC adapter or supplied from a battery. Image processing is executed.

  In the first embodiment, an image processing circuit used for image processing is selected from a plurality of image processing circuits constituting the image processing / display output unit 32 in accordance with each power supply state shown in FIG. To do. That is, when the power supply source is an AC power supply or a battery, and when the power supply source is a battery, the remaining battery level (life) is 30% or more, less than 30% to 20% or more, and less than 20% to 10%. Assume that the image processing circuit is selected according to each power supply state in the case of% or more.

  Next, the operation of the image processing / display output unit 32 of the first embodiment will be described with reference to the flowchart shown in FIG.

  The power supply unit 16 determines whether the AC adapter is inserted, that is, whether the power supply source is AC or a battery. The I / O unit 24 notifies the CPU 20 of information indicating the power supply source determined by the power supply unit 16 by interrupt processing.

  First, when power is supplied from the AC adapter, it is not necessary to consider the battery life, and therefore the CPU 20 executes image processing for obtaining the highest image quality characteristics for the image processing / display output unit 32. The image processing circuit is selected as described above.

  For example, the functions of the blocks of the two-dimensional processing unit 47 and the three-dimensional processing unit 48 in the image processing / display output unit 32 are stopped, and control is performed so that image processing is executed using other image processing circuits.

  The image processing / display output unit 32 inputs the video data decoded by the video decoding unit 30 via the input image storage unit 40 (step A1) and stores it in the frame memory 46 (step A4).

  The motion adaptive processing unit 49 reads the current image stored in the frame memory 46 from the frame memory 46 (step A10), and reads the previous image data stored in the previous image frame memory 50 (step A21), 2 Two image data are compared to calculate a motion vector (step A22), and the calculated motion vector is stored. The scaling unit 41 reads the motion vector calculated by the motion adaptive processing unit 49 (step A24), executes the scaling process on the current image data using the motion vector, and obtains the image data obtained as a result Is written into the frame memory 46 (step A25).

  Next, the I / P conversion processing unit 42 reads out the motion vector calculated by the motion adaptive processing unit 49 (step A26), the scaled image data, and the previous image stored in the previous image frame memory 50. Data is compared and I / P conversion processing is performed using the motion vector. The I / P conversion processing unit 42 writes the image data obtained by the I / P conversion processing in the frame memory 46 (step A27).

  Next, the contrast automatic adjustment unit 43 reads the motion vector calculated by the motion adaptive processing unit 49 (step A28), and stores the image data subjected to the I / P conversion processing and the previous image frame memory 50 stored in the previous image frame memory 50. The image data is compared and a contrast adjustment process is performed using a motion vector. The contrast automatic adjustment unit 43 writes the image data obtained by the contrast adjustment process in the frame memory 46 (step A29).

  Next, the contour correction processing unit 44 reads out the motion vector calculated by the motion adaptive processing unit 49 (step A30), the contrast-adjusted image data, the previous image data stored in the previous image frame memory 50, and And contour correction processing using the motion vector. The contour correction processing unit 44 writes the image data obtained by the contour correction processing in the frame memory 46 (step A31).

  After the series of processing is completed, the motion adaptive processing unit 49 stores the current image data stored in the frame memory 46 in the previous image frame memory 50 and prepares for processing for the image data of the next frame. (Step A20).

  The image processing / display output unit 32 processes the image data subjected to the contour correction processing stored in the frame memory 46 as output image data, and outputs it to the display device 18 via the output image storage unit 45 (step A3). ).

  In the same manner, image processing is sequentially performed on the image data of the next frame and displayed on the display device 18.

  Thus, when the power supply source is AC, an image processing circuit is selected and image processing is performed on the image data by using all image processing techniques so that the image quality can be improved most. .

Next, a case where power is supplied from a battery will be described.
The CPU 20 is notified of information indicating that the power supply source is a battery from the I / O unit 24 and that the remaining battery level (life) is 30% or more. In this case, the CPU 20 selects an image processing circuit with respect to the image processing / display output unit 32 such that image processing that provides high image quality characteristics is executed.

  For example, the functions of the two-dimensional processing unit 47 and the motion adaptive processing unit 49 in the image processing / display output unit 32 are stopped, and control is performed so that image processing is executed using other image processing circuits.

  The image processing / display output unit 32 inputs the video data decoded by the video decoding unit 30 via the input image storage unit 40 (step A1) and stores it in the frame memory 46 (step A4).

  The three-dimensional processing unit 48 reads the current image stored in the frame memory 46 from the frame memory 46 (step A10), and reads the previous image data stored in the previous image frame memory 50 (step A12). A three-dimensional process is performed for comparing the image data with pixels in the vicinity of the top, bottom, left and right. The scaling unit 41 performs scaling processing on the current image data using the result of the three-dimensional processing by the three-dimensional processing unit 48, and writes the image data obtained as a result in the frame memory 46 (step A13).

  Next, the I / P conversion processing unit 42 performs I / P conversion processing using the result of the three-dimensional processing executed using the previous image data read from the previous image frame memory 50 by the three-dimensional processing unit 48. And the resulting image data is written into the frame memory 46 (steps A14 and A15).

  Next, the automatic contrast adjustment unit 43 similarly performs the contrast adjustment processing using the result of the three-dimensional processing executed using the previous image data read from the previous image frame memory 50 by the three-dimensional processing unit 48. And the resulting image data is written into the frame memory 46 (steps A16 and A17).

  Next, the automatic contrast adjustment unit 43 similarly performs contour correction processing using the result of the three-dimensional processing executed using the previous image data read from the previous image frame memory 50 by the three-dimensional processing unit 48. The image data obtained as a result is written into the frame memory 46 (steps A18 and A19).

  After the series of processing ends, the three-dimensional processing unit 48 stores the current image data stored in the frame memory 46 in the previous image frame memory 50 and prepares for processing for the image data of the next frame. (Step A20).

  The image processing / display output unit 32 processes the image data subjected to the contour correction processing stored in the frame memory 46 as output image data, and outputs it to the display device 18 via the output image storage unit 45 (step A3). ).

  In the same manner, image processing is sequentially performed on the image data of the next frame and displayed on the display device 18.

  Thus, when the power supply source is a battery and the remaining battery level is sufficient (30% or more), the image processing circuit is selected to achieve high image quality, and image processing is performed on the image data. Is done.

Next, a case where information indicating that the remaining battery level (life) is less than 30% to 20% or more will be described.
In this case, the CPU 20 includes, for example, an input image storage unit 40, a scaling unit 41, an I / P conversion processing unit 42, an output image storage unit 45, a frame memory 46, and a two-dimensional processing unit 47 in the image processing / display output unit 32. Image processing is performed using only the image processing circuit.

  The image processing / display output unit 32 inputs the video data decoded by the video decoding unit 30 via the input image storage unit 40 (step A1) and stores it in the frame memory 46 (step A4).

  The two-dimensional processing unit 47 reads out the current image stored in the frame memory 46 from the frame memory 46 (Step A6), and executes a two-dimensional process for comparing the upper, lower, left, and right neighboring pixels with respect to the target pixel. The scaling unit 41 performs scaling processing on the current image data using the result of the two-dimensional processing by the two-dimensional processing unit 47, and writes the image data obtained as a result in the frame memory 46 (step A7).

  Next, the I / P conversion processing unit 42 performs I / P conversion processing using the result of the two-dimensional processing executed using the previous image data read from the previous image frame memory 50 by the two-dimensional processing unit 47. And the resulting image data is written into the frame memory 46 (steps A8 and A9).

  The image processing / display output unit 32 processes the image data subjected to the I / P conversion processing stored in the frame memory 46 as output image data, and outputs the output image data to the display device 18 via the output image storage unit 45 ( Step A3).

  In the same manner, image processing is sequentially performed on the image data of the next frame and displayed on the display device 18.

  Thus, when the power supply source is a battery and the remaining battery level is low (less than 30%), the image processing applied to the image data is limited to, for example, scaling processing and I / P conversion processing, By selecting and operating only the image processing circuits necessary for the image processing, it is possible to reduce the power consumption associated with the image processing in the image processing / display output unit 32. Further, even when the remaining battery level is low, all image processing is not stopped, so that the image quality can be maintained.

Next, a case where information indicating that the remaining battery level (lifetime) is less than 20% to 10% is notified will be described.
In this case, for example, the CPU 20 selects only the input image storage unit 40 and the output image storage unit 45 in the image processing / display output unit 32.

  The image processing / display output unit 32 inputs the video data decoded by the video decoding unit 30 via the input image storage unit 40 (step A1), and outputs it to the display device 18 via the output image storage unit 45 (step A1). Step A3).

  In this way, when the power supply source is a battery, and the remaining battery level is very low and a warning state is reached (less than 20%), the operation possible time without executing image processing for improving the quality is performed. Can be extended.

In this manner, in the digital broadcast receiver 10 according to the first embodiment, the image processing / display output unit 32 executes the power supply source determined by the power supply unit 16 and the remaining battery level (life). Realize image processing technology and image processing solution (motion application type, 3D processing, 2D processing) In the above description, the state of the power supply source is determined, but the video input state and video output state May be selected to select an image processing circuit. For example, as the video input state, for example, 480i, 480p, 720i, 720p, 1080i, 1080p are determined. Further, as the video output state, QVGA, VGA (Video Graphics Array), SVGA (Super VGA), and XGA (Extended Graphics Array) are discriminated. For example, as the data amount of video input or video output increases, the image processing / display output unit 32 performs image processing using more image processing techniques.

  Furthermore, the backlight luminance state of the display device 18 (liquid crystal display) may be determined, and an image processing circuit in the image processing / display output unit 32 may be selected according to this state to execute image processing.

(Second Embodiment)
The operation of the digital broadcast receiver 10 in the second embodiment will be described.
In the second embodiment, when the power supply source is a battery, the expected viewable time when each image quality is used based on the remaining battery level is calculated, and the user selects any image quality, In response to this selection, each image processing unit constituting the image processing / display output unit 32 is selectively used to execute image processing.

  In the second embodiment, each power supply state shown in FIG. 3B is determined by the power supply unit 16 and notified to the CPU 20 by the I / O unit 24. That is, when the power supply source is an AC power supply or a battery, and when the power supply source is a battery, the remaining battery level (life) is 100% to 90% or more, less than XX% to YY% or more (“XX “YY” is an arbitrary value), and the respective power supply states in the case of less than 20% to 10% or more and less than 10% are notified.

  Next, the operation of the second embodiment will be described with reference to the flowchart shown in FIG.

  The power supply unit 16 determines whether the AC adapter is inserted, that is, whether the power supply source is AC or a battery. The I / O unit 24 notifies the CPU 20 of information indicating the power supply source determined by the power supply unit 16 by interrupt processing.

  First, when power is supplied by the AC adapter (step B1), it is not necessary to consider the battery life, so the CPU 20 has the highest image quality characteristics (ultra high image quality) for the image processing / display output unit 32. The image processing circuit is selected so that the image processing for obtaining the above is executed (step B2).

  For example, the functions of the blocks of the two-dimensional processing unit 47 and the three-dimensional processing unit 48 in the image processing / display output unit 32 are stopped, and control is performed so that image processing is executed using other image processing circuits. Note that the processing in the image processing / display output unit 32 in this case is executed in the same manner as in the first embodiment, and detailed description thereof is omitted.

  The image processing / display output unit 32 outputs the image data that has been subjected to each image processing so as to obtain super high image quality to the display device 18 for display (step B3).

  Thus, when the power supply source is AC, an image processing circuit is selected and image processing is performed on the image data by using all image processing techniques so that the image quality can be improved most. .

Next, a case where power is supplied from a battery will be described.
The CPU 20 checks the remaining battery level (life) notified by the interrupt process from the I / O unit 24 and determines, for example, which of the power supply states shown in FIG. 3B corresponds (step B4).

  Based on the remaining battery level notified from the I / O unit 24, the CPU 20 can use the image processing / display output unit 32 to perform image processing for obtaining each image quality (mode), that is, an available time. The remaining expected viewable time is calculated (step B5).

  FIG. 6 shows an example of information indicating the expected viewable time for each image quality (mode). As the image quality (mode), five types (super high image quality, high image quality, standard (medium) image quality, low image quality, and ultra low image quality) can be set.

  For example, in the case of the super high image quality mode, the image processing such as scaling processing, I / P conversion processing, contour correction processing, and contrast (automatic) adjustment processing is executed as an effective image processing function. Further, as an effective solution means, it is assumed that motion adaptive processing is executed.

In the case of the high image quality mode, the effective image processing function is the same as that in the case of super high image quality, but it is assumed that three-dimensional processing is executed as an effective solution means.
In the case of the standard (medium) image quality mode, it is assumed that the effective image processing function is the same as that in the case of super high image quality, and two-dimensional processing is executed as effective solution means.

  In the case of the low image quality mode, it is assumed that scaling processing and I / P conversion processing are executed as effective image processing functions, and two-dimensional processing is executed as effective resolution means.

  In the case of the ultra-low image quality mode, image processing for improving the image quality is not executed, and the video data decoded by the video decoding unit 30 is output as it is.

  In order to execute the effective image processing function of each mode, the power consumption differs by selectively using the image processing circuit provided in the image processing / display output unit 32. For example, when the super high image quality mode is selected with the current remaining battery level, the expected viewable time is 1 hour. The expected viewable time in the high image quality mode is 1 hour 30 minutes. Similarly, the standard (medium) image quality mode is 2 hours, the low image quality mode is 2 hours 30 minutes, and the ultra-low image quality mode. In some cases it will be 3 hours.

  The CPU 20 displays a list of available times corresponding to each image quality (mode) on the display device 18 as a selection display menu. FIG. 7 shows an example of the selection display menu screen. In the selection display menu, the expected viewable time for each of the image quality modes 1 to 5 is displayed.

  Here, when one of the image quality modes is selected by an operation on an input device (not shown) by the viewer, the CPU 20 selects an image selection circuit of the image processing / display output unit 32 according to the selected image quality mode. Then, the video data decoded by the video decoding unit 30 is subjected to image processing and displayed on the display device 18.

  Note that the detailed description of the processing of the image processing / display output unit 32 in each image mode is omitted even though it is executed in the same manner as in the first embodiment.

  In this way, the viewer can select the image quality with reference to the expected viewable time calculated based on the power supply source and the remaining battery level, so the viewable time required by the viewer Image processing can be performed so that a high-quality image can be obtained as much as possible.

(Third embodiment)
Next, a third embodiment will be described.
The third embodiment is a digital broadcast recording apparatus having the same function as the first embodiment or the second embodiment described above.

  The digital broadcast recording apparatus of the third embodiment is detailed as having the configuration shown in FIG. 1 except that a recording function for recording image data subjected to image processing by the image processing / display output unit 32 is provided. The detailed explanation is omitted.

  By applying the function described in the first embodiment or the second embodiment to the digital broadcast recording apparatus, it is possible to obtain the same effect as described above when recording in the digital broadcast recording apparatus.

  Note that the above embodiment includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of problems to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

The block diagram which shows the system configuration | structure of the digital broadcast receiver 10 in this embodiment of this invention. FIG. 3 is a diagram showing a detailed configuration of an image processing / display output unit 32 in the present embodiment. The figure which shows an example of the power supply state discriminated in 1st Embodiment and 2nd Embodiment. 6 is a flowchart for explaining an operation in the image processing / display output unit 32 of the first embodiment. The flowchart for demonstrating operation | movement of 1st Embodiment. An example of the information which shows the estimated viewable time in each image quality (mode) in 2nd Embodiment is shown. The figure which shows an example of the selection display menu screen in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Digital broadcast receiver, 12 ... Main part, 14 ... Antenna, 16 ... Power supply part, 18 ... Display device, 20 ... CPU, 21 ... Main memory, 22 ... ROM, 23 ... Flash memory, 24 ... I / O part , 26 ... tuner, 27 ... demodulation unit, 28 ... decoding unit, 29 ... audio decoding unit, 30 ... video decoding unit, 32 ... image processing / display output unit, 40 ... input image storage unit, 41 ... scaling unit, 42 ... I / P conversion processing unit, 43 ... automatic contrast adjustment unit, 44 ... contour correction processing unit, 45 ... output image storage unit, 46 ... frame memory, 47 ... two-dimensional processing unit, 48 ... three-dimensional processing unit, 49 ... movement Adaptive processing unit, 50... Previous image frame memory.

Claims (6)

In a digital broadcast receiver that receives digital broadcast data and displays an image,
A plurality of image processing circuits;
Power discriminating means for discriminating which of an external power source and a battery is a power source;
And a selection unit configured to select an image processing circuit to be used for image processing from the plurality of image processing circuits when the power supply determination unit determines that the power supply source is the battery. Broadcast receiver. In a digital broadcast receiver that receives digital broadcast data and displays an image,
A plurality of image processing circuits;
A remaining amount detecting means for detecting a remaining amount of a battery as a power supply source;
A digital broadcast receiver comprising: a selecting unit that selects an image processing circuit to be used for image processing from the plurality of image processing circuits according to the remaining amount detected by the remaining amount detecting unit. Determining means for determining a combination of predetermined image processing circuits among the plurality of image processing circuits according to the remaining amount detected by the remaining amount detecting means;
3. The digital broadcast receiver according to claim 2, wherein the selection unit selects an image processing circuit corresponding to the combination determined by the determination unit. Time calculating means for calculating the viewable time in each combination when the plurality of image processing circuits are selectively used in combination according to the remaining amount detected by the remaining amount detecting means;
A selection screen display means for displaying a screen for selecting the usable time calculated by the time calculation means;
An instruction input means for inputting an instruction to select the usable time displayed by the selection screen display means;
3. The digital broadcast receiver according to claim 2, wherein the selection unit selects a combination of image processing circuits corresponding to the usable time indicated by the instruction input by the instruction input unit. In a digital broadcast recording apparatus that receives digital broadcast data and records an image,
A plurality of image processing circuits;
Power discriminating means for discriminating which of an external power source and a battery is a power source;
Selecting means for selecting an image processing circuit to be used for image processing from the plurality of image processing circuits when the power supply determining means determines that the power supply source is the battery;
A digital broadcast recording apparatus comprising: an image recording unit that records an image processed by the image processing circuit selected by the selection unit. In a digital broadcast recording apparatus that receives digital broadcast data and records an image,
A plurality of image processing circuits;
A remaining amount detecting means for detecting a remaining amount of a battery as a power supply source;
Selecting means for selecting an image processing circuit to be used for image processing from the plurality of image processing circuits according to the remaining amount detected by the remaining amount detecting means;
A digital broadcast recording apparatus comprising: an image recording unit that records an image processed by the image processing circuit selected by the selection unit.

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