JP2002281478A - Image display device, image disassembly device, image display method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device, etc., which utilizes contents while preventing disordered duplication and prevents high quality image duplication by preparing a screen shot. SOLUTION: An image display terminal 3 supplies the image ID of an image desired to be utilized to a contents server 1. The contents server 1 supplies image data representing the image in an enciphered state with a cryptographic key to the image display terminal 3 and transfers the image ID and an identification code for the image display terminal 3 to a license server 2. The license server 2 supplies a cryptographic key for decoding the image data shown by the image ID to the image display terminal 3. The image display terminal 3 acquires and stores the cryptographic key, decodes the image data with the stored cryptographic key, generates disassembled image data from the image data, sequentially switches disassembled images represented by the disassembled image data in a short time and displays the disassembled images. Since the disassembled images are switched and displayed in a short time, a person looking at the disassembled images substantially recognizes an image being the same as the original image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, an image decomposition device, and an image display method for supplying contents while preventing illegal use of contents including images.

[0002]

2. Description of the Related Art In order to securely distribute digital contents such as image data through a network, a method of encrypting and transmitting digital contents and a method of authenticating a user of digital contents are used.

[0003]

However, once the digital contents are decrypted or the user is authenticated, the contents can be used in an unregulated manner such as copying without restriction. There is a problem that the interests of the right holders of the content are lost.

[0004] In particular, in the case of digital content representing an image to be displayed on a display screen of a display device provided in a computer, a program for creating a screenshot by the computer (that is, an image representing an image currently displayed on the display device of the computer). (A program for creating data), the computer displays an image represented by the decrypted digital content, and causes the computer to create a screen shot. Was easily duplicated while maintaining the quality of this image.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image display device, an image decomposing device, and an image display method for utilizing contents while preventing disorderly duplication of the contents. And Also,
The present invention provides an image display device for preventing an image from being duplicated with high quality by creating a screen shot,
It is an object to provide an image decomposition device and an image display method.

[0006]

In order to achieve the above object, an image display device according to a first aspect of the present invention acquires original image data representing an original image, and, based on the acquired original image data, Image decomposing means for generating a plurality of decomposed image data representing a plurality of decomposed images corresponding to degraded original images represented by the original image data; and a plurality of decomposed image data represented by each decomposed image data generated by the image decomposing means. By sequentially replacing and displaying the disassembled images, image display means for allowing a person to visually recognize an image substantially the same as the original image,
It is characterized by having.

According to such an image display device, the original image data is decomposed into a plurality of decomposed image data representing decomposed images of lower quality than the original image. But can not practically. Therefore, random copying of the original image data is prevented. By displaying the decomposed images sequentially, the images that are visually substantially the same as the original images are reproduced. Therefore, the original image can be used while preventing random copying of the original image data. In addition, even if a screenshot is created while the disassembled images are sequentially displayed, only data representing one of the disassembled images can be obtained. Is prevented.

The image decomposing means may acquire the original image data, temporarily store the original image data, and generate the decomposed image data based on the temporarily stored original image data. In this case, if the image decomposing means deletes the temporarily stored original image data, disorderly duplication of the original image data due to reading of the original image data is prevented.

[0009] The original image data may include, for example, pixel data representing pixels constituting the original image.
In this case, the image decomposing unit includes, for example, a unit that generates the decomposed image data including each of the sets by distributing the pixel data included in the acquired original image data into a plurality of sets. , May be generated.

[0010] The original image data may include, for example, pixel color data representing the colors of pixels constituting the original image. In this case, for example, based on the pixel color data included in the acquired original image data, the image decomposing unit may change a color that is substantially the same as the color represented by the pixel color data when displayed by being sequentially replaced. A plurality of separated pixel color data representing a plurality of colors to be visually recognized is generated, and the generated separated pixel color data is generated so that those representing the same pixel do not belong to the same set. What is necessary is just to generate the decomposed image data by providing a means for generating the decomposed image data by sorting into sets.

[0011] The pixel color data may represent, for example, the color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components. In this case, the image separation unit generates, for example, a plurality of the separated pixel color data representing the color represented by the pixel color data included in the acquired original image data for each primary color component, and generates each of the generated separated pixel colors. Decomposed image data may be generated by providing means for distributing data to a plurality of sets such that data representing the same primary color belong to the same set.

In the case where the pixel color data represents the color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components, the image separating means may calculate an average of the intensities of the respective primary color components. By providing means for generating a plurality of the separated pixel color data having a relationship such that the value is substantially equal to the intensity of the primary color component represented by the pixel color data included in the original image data, Data may be generated.

In the case where the pixel color data represents the color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components, the image separating means may calculate an average of the intensities of the respective primary color components. The plurality of pixels having a relationship such that the value is substantially equal to the average value of the intensity of the primary color component represented by each of the pixel color data included in the plurality of primary image data representing a plurality of pixels adjacent to each other. By providing means for generating separated pixel color data, the separated image data may be generated.

According to a second aspect of the present invention, there is provided an image separating apparatus, comprising: means for acquiring original image data representing an original image; and an original image represented by the original image data based on the acquired original image data. Means for generating a plurality of decomposed image data representing a plurality of decomposed images that correspond to the degraded ones and allow a person to visually recognize an image substantially the same as the original image when sequentially displayed and replaced. Comprising.

According to such an image decomposing apparatus, the original image data is decomposed into a plurality of decomposed image data representing decomposed images of lower quality than the original image. But can not practically. Therefore, random copying of the original image data is prevented.

Further, in an image display method according to a third aspect of the present invention, original image data representing an original image is acquired, and the original image represented by the original image data is degraded based on the acquired original image data. By generating a plurality of decomposed image data representing a plurality of decomposed images corresponding to a plurality of decomposed images and sequentially displaying the plurality of decomposed images represented by the generated decomposed image data, substantially the same as the original image is displayed. Is visually recognized by a person.

According to such an image display method, the original image data is decomposed into a plurality of decomposed image data representing decomposed images of lower quality than the original image. But can not practically. Therefore, random copying of the original image data is prevented. By displaying the decomposed images sequentially, the images that are visually substantially the same as the original images are reproduced. Therefore, the original image can be used while preventing random copying of the original image data. In addition, even if a screenshot is created while the disassembled images are sequentially displayed, only data representing one of the disassembled images can be obtained. Is prevented.

Further, a program according to a fourth aspect of the present invention is a program for causing a computer to acquire original image data representing an original image and to degrade the original image represented by the original image data based on the acquired original image data. Image decomposing means for generating a plurality of decomposed image data representing a plurality of decomposed images corresponding to the decomposed image, and displaying the decomposed images represented by each of the decomposed image data generated by the image decomposing means in order. Accordingly, the image display device is intended to function as image display means for allowing a person to visually recognize an image substantially identical to the original image.

A computer that executes such a program decomposes the original image data into a plurality of decomposed image data representing decomposed images of lower quality than the original image. Can not practically. Therefore, random copying of the original image data is prevented. By displaying the decomposed images sequentially, the images that are visually substantially the same as the original images are reproduced. Therefore, the original image can be used while preventing random copying of the original image data. In addition, even if a screenshot is created while the disassembled images are sequentially displayed, only data representing one of the disassembled images can be obtained. Is prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image display device, an image decomposing device, and an image display method according to an embodiment of the present invention will be described using an image distribution system as an example. FIG. 1 is a diagram illustrating a configuration of an image distribution system according to an embodiment of the present invention. As shown, the image distribution system includes a content server 1, a license server 2, and an image display terminal 3.

Content server 1 and image display terminal 3
Are connected to an external network (not shown), and the content server 1 and the license server 2 and the license server 2 and the image display terminal 3 are connected to each other via this network. Is done.
Each of the content server 1, the license server 2, and the image display terminal 3 is assigned a unique identification code. The identification code is, for example, IP (Internet Proto
col) address.

As shown in FIG. 2, the content server 1 includes a control unit 11, a main storage unit 12, and an external storage unit 13.
And a transmission / reception unit 14. The main storage unit 12, the external storage unit 13, and the transmission / reception unit 14 are all connected to the control unit 11 via an internal bus.

The control unit 11 has a CPU (Central Process
ng Unit) and the like, and performs processing described later according to a program stored in the external storage unit 13. The main storage unit 12 includes a RAM (Random Access Memory) and the like,
Used as a work area of the control unit 11. External storage unit 1
Numeral 3 is composed of a hard disk device or the like, and stores in advance a program for causing the control unit 11 to perform processing described later. Then, the external storage unit 13 supplies data stored therein to the control unit 11 according to an instruction from the control unit 11.

The external storage unit 13 stores the image display terminal 3
, Image data representing an image to be displayed is stored in an encrypted form, and further, link information including a URL (Uniform Resource Locator) of the image data to be distributed is stored. The link information includes, for example, the image data URL to be distributed and the U of the image (banner) to be clicked by the user or the like of the image display terminal 3 using a mouse or the like to select the image data indicated by the URL.
HTML (HyperTex
t Markup Language) documents. Further, the external storage unit 13 stores an identification code uniquely assigned to the license server 2.

The URL is a server that stores data to be accessed (for example, the content server 1).
And a logical position (directory) of the storage area in which the data to be accessed is stored in the storage area of the storage device included in the server. The encryption of image data is performed, for example, by DES (Data Encry
ption Standard) based on a common key encryption method.

The image data stored in the external storage unit 13 includes dot data representing pixels constituting the image. The dot data representing the color of each pixel specifically includes, for example, three data representing the strength of each primary color when the color of this pixel is separated into three primary colors.

The transmission / reception unit 14 has a DSU (Data Service U).
nit), a terminal adapter, and the like, and are connected to the control unit 11 via an internal bus, and are also connected to the above-described network. The transmitting / receiving unit 14 includes the control unit 11
The information supplied from the control unit 11 is transmitted to the image display terminal 3 in accordance with the instruction (i.e., transmitted with the identification code of the image display terminal 3 to the network). Further, it receives information addressed to itself (that is, information with an identification code of the content server 1) from the network and supplies it to the control unit 11.

As shown in FIG. 3, the license server 2 includes a control unit 21, a main storage unit 22, and an external storage unit 23.
And a transmission / reception unit 24. The main storage unit 22, the external storage unit 23, and the transmission / reception unit 24 are all connected to the control unit 21 via an internal bus.

Control unit 21, main storage unit 22, external storage unit 2
3 and the transmission / reception unit 24 are the control unit 1 of the content server 1
1, has substantially the same configuration as the main storage unit 12, the external storage unit 13, and the transmission / reception unit 14. The external storage unit 23
In addition to storing in advance a program for causing the control unit 21 to perform processing described later, an image ID (IDentification) for identifying image data stored in the content server 1
And an encryption key for decrypting the image data identified by the image ID are stored in association with each other.

As shown in FIG. 4, the image display terminal 3 includes a control unit 31, a main storage unit 32, an external storage unit 33, a transmission / reception unit 34, an input unit 35, and a display unit 36. You. The main storage unit 32, the external storage unit 33, the transmission / reception unit 34, the input unit 35, and the display unit 36 are all connected to the control unit 31 via an internal bus.

The control unit 31 includes a CPU and the like, and according to each program described later stored in the external storage unit 33,
The processing described below is executed. The main storage unit 32 includes a RAM or the like, and is used as a work area of the control unit 31. The external storage unit 33 includes a non-volatile storage device such as a hard disk device, and stores in advance a program for causing the control unit 31 to perform processing described below. Then, in accordance with an instruction from the control unit 31, the control unit 31 supplies data stored therein to the control unit 31.

The programs stored in the external storage unit 33 include an image display program described later and a program for controlling the processing of the browser described later. Further, the external storage unit 33 also stores image data and an encryption key stored by the control unit 31 by a process described later.

The transmission / reception unit 34 includes a modem, a terminal adapter, and the like, is connected to the control unit 31 via an internal bus, and is connected to a network. The transmission / reception unit 34 sends out the information supplied from the control unit 31 to the network according to the instruction of the control unit 31. Further, it receives information addressed to itself from the network and supplies it to the control unit 31.

The input unit 35 includes a keyboard, a mouse, and the like, and supplies information according to the operation of the operator to the control unit 31.

The display unit 36 includes a CRT (cathode ray tube), LC
D (Liquid Crystal Display) and VRA
The storage device includes an M (Video RAM) or the like, and a controller including a logic circuit or the like for controlling access to the storage device.

The controller of the display unit 36 includes a controller 31
Is stored in the storage area of the storage device of the display unit 36, and the stored bitmap is read and supplied to the display device of the display unit 36. The display device of the display unit 36 displays the pixels represented by the bitmap supplied from the controller of the display unit 36 on its own display screen.

(Operation) Next, the operation of the image distribution system shown in FIG. 1 will be described with reference to FIGS. FIG.
5 is a flowchart illustrating processing of the content server 1, the license server 2, and the image display terminal 3 when a usage right is acquired. FIG. 6 is a flowchart showing the processing of the image display terminal 3 when displaying an image.

(Process at the Time of Obtaining Use Right) When the user of the image display terminal 3 wants to obtain the use right of the image from the content server 1, the user first enters the input unit 3 of the image display terminal 3.
5 to instruct the image display terminal 3 to execute the processing of the browser. When instructed to execute the processing of the browser, the control unit 31 of the image display terminal 3 reads out the program data of the browser from the external storage unit 33 and starts the processing of the browser. The control unit 31 that has started the processing of the browser,
The user waits until the user operates the input unit 35 to input the URL of the data to be accessed, and when the input of the URL is completed, the input URL and the identification assigned to the image display terminal 3 itself. The code is supplied to the transmission / reception unit 34. The transmission / reception unit 34 transmits the URL supplied to itself and the identification code of the image display terminal 3 to the network in association with each other (FIG. 5, step S101).

The URL transmitted in step S101 is
When indicating the directory in which the link information of the image data to be distributed is stored, the transmitting / receiving unit 14 of the content server 1 receives the information transmitted in step S101 and supplies the information to the control unit 11 (step S201). . When the control unit 11 is supplied with the URL and the identification code of the image display terminal 3, of the data stored in the external storage unit 13, the link stored in the directory indicated by the URL supplied from the transmission / reception unit 14. Read information. Then, the read link information is transmitted to the image display terminal 3 indicated by the identification code via the transmission / reception unit 14 (step S202).

The transmitting / receiving section 34 of the image display terminal 3 receives the data transmitted to the image display terminal 3 in step S202 and supplies the data to the control section 31. The control unit 31 instructs the display unit 36 to display the link information represented by the data, and the display unit 36 displays the link information according to the instruction (step S102). If the link information includes the banner URL, the control unit 31 acquires the banner image data from the directory indicated by the banner URL included in the link information, and instructs the display unit 36 to display the banner.

When the display unit 36 displays the link information,
The control unit 31 waits for the user to operate the input unit 35 to specify image data to be distributed. And
When the image data is designated, the control unit 31 and the transmitting / receiving unit 3
4 transmits the URL of the designated image data and the identification code of the image display terminal 3 to the network in association with each other (step S103). When the link information includes the URL of the banner, the user inputs, for example, the banner associated with the image data to be distributed to the input unit 3.
By operating and clicking the mouse of No. 5, the image data may be specified.

When the transmission / reception unit 14 of the content server 1 receives the information transmitted in step S103, the transmission / reception unit 14 and the control unit 11 perform steps S201 and S20.
The same process as the process 2 is performed (step S20).
3). Through the processing in step S203, the content server 1 transmits the encrypted image data in the directory indicated by the URL transmitted in step S103 to the image display terminal 3. Transmission / reception unit 34 of image display terminal 3
Receives the image data transmitted in step S203 and supplies the image data to the control unit 31, and the control unit 31 stores the image data in the external storage unit 33 as encrypted (step S104).

The control unit 11 reads out the identification code of the license server 2 from the external storage unit 13 and stores the image data designated by the user of the image display terminal 3 (that is, in the directory indicated by the URL transmitted in step S103). The image ID indicating the image data) and the identification code of the image display terminal 3 are transmitted to the server indicated by the identification code read from the external storage unit 13 (that is, the license server 2) via the transmission / reception unit 14 (step S204). ).

The transmission / reception unit 24 of the license server 2 receives the identification code and the image ID of the image display terminal 3 transmitted in step S204 via the network (step S301) and supplies them to the control unit 21. Then, the control unit 21 reads the encryption key associated with the image ID from the external storage unit 23, and transmits the read encryption key and the image ID received in step S301 to the image display terminal via the transmission / reception unit 24. 3 (step S30).
2). In step S302, the encryption key and the image ID are stored in a procedure (for example, SSL (Secure) to prevent the contents of the payment data from being leaked due to an external attack.
It is desirable that the data be transmitted according to a protocol such as Socket Layer).

On the other hand, the transmitting / receiving section 34 of the image display terminal 3
In step S302, the encryption key and the image ID transmitted to the image display terminal 3 are received and supplied to the control unit 31. When supplied with the encryption key and the image ID, the control unit 31 encrypts the encryption key in such a manner that the encryption key and the image ID can be decrypted by the process of step S401 described later.
D, and stored in the external storage unit 33 (step S
105). The encryption key is desirably encrypted in such a manner that decryption is substantially impossible by a method other than the method of step S401 described later.

Steps S101 to S10 described above
5. Steps S201 to S204 and S301 to S302
By the processing described above, the image data is supplied from the content server 1 to the image display terminal 3, and the user obtains the encrypted image data. Further, an encryption key for decrypting the image data is supplied from the license server 2 to the image display terminal 3, whereby the right to use the image is given to the user of the image display terminal 3.

(Processing at the time of image display) When the user browses the image represented by the encrypted image data, the user
The user operates the input unit 35 of the image display terminal 3 to instruct execution of the image use program. The control unit 31 starts the processing of the image using program in response to the instruction.

Then, the control section 31 first waits for the user to operate the input section 35 to input the image ID of the image desired to be viewed and to instruct the image viewing. When the user inputs an image ID and instructs image browsing, the control unit 31 responds to the instruction and reads out an encrypted encryption key associated with the image ID input by the user from the external storage unit 33. (Step S401 in FIG. 6).
Then, of the encrypted image data stored in the external storage unit 33, image data identified by the image ID input by the user is decrypted using the encryption key decrypted in step S401 (step S401). S402).

Next, the control unit 31 generates a plurality of decomposed image data based on the decoded image data, and temporarily stores the decoded image data in the main storage unit 32 and the external storage unit 33. If the image data is stored, the image data is deleted (step S403). The control unit 31
The decoded image data is stored in the main storage unit 32 or the external storage unit 33.
May not be written even temporarily. In this case, it is not necessary to delete the image data stored in the main storage unit 32 or the external storage unit 33 in step S403.

An image represented by each decomposed image data generated in step S403 (hereinafter, referred to as a decomposed image) is obtained when these decomposed images are sequentially replaced in a short time and displayed.
This is an image that is recognized by a person as an image that is substantially the same as the image represented by the original image data used to generate these decomposed images. However, the quality of each decomposed image is lower than the quality of the image represented by the original image data.

More specifically, in step S403, the control unit 3
For example, by distributing the dot data included in the decoded image data into a plurality of sets according to a predetermined criterion, 1 generates the number of pieces of decomposed image data equal to the number of the sets. More specifically, for example, assuming that the pixels forming the image represented by the image data are arranged so as to form a row (or a column), the control unit 31 assigns the dot data to the pixel represented by the dot data. The order in which rows (or columns) are counted from a specific side of the image is a predetermined natural number n of 2 or more.
Then, n divided image data from the first to the n-th are generated by sorting the data having the same remainder after the division. Note that the pixels indicated by the dot data included in each decomposed image data are arranged at substantially the same position as the position occupied by the pixel in the image represented by the original image data.

Next, the control section 31 sequentially supplies the first to n-th decomposed image data to the display section 36 from the first, and displays the decomposed image represented by the supplied decomposed image data. , To the display unit 36. The display unit 36 sequentially displays the decomposed images represented by the decomposed image data supplied from the control unit 31 according to the instruction (step S40).
4).

More specifically, when the controller of the display unit 36 supplies the decomposed image data from the control unit 31,
The dot data included in the decomposed image data is stored as a bitmap in the storage area of its own storage device. If there is an old bitmap already stored in this storage area, the old bitmap is overwritten or simply erased. The deletion of the old bitmap is performed by the control unit 31.
May be performed by instructing the display unit 36 to delete and the display unit 36 may respond to this instruction, or the control unit 31 may directly access the storage device of the display unit 36 to perform the deletion. Then, the controller reads the bitmap stored in the storage area and supplies the read bitmap to the display device of the display unit 36.
The display device of the display unit 36 displays the pixel represented by the bitmap on its own display screen. As a result, in step S404, the display unit 36 sequentially switches and displays the n decomposed images.

The speed at which the n separated images are replaced is such that the image displayed by the display unit 36 in step S404 is substantially the same as the image represented by the original image data used to generate these separated images. The speed is set so that a person can recognize the same image.

Steps S401 to S404 described above
By the processing described above, the image represented by the image data for which the user has the usage right is displayed. On the other hand, when the image display terminal 3 is executing a program for creating a screen shot (that is, a program for creating image data representing an image currently displayed on the display unit 36), the control unit 31 according to the control of this program Reads the bitmap stored in the storage area of the storage device of the display unit 36, and creates a screen shot based on the read bitmap. However, the decomposition image represented by the bitmap stored in the storage area of the storage device of the display unit 36 by the processing of steps S401 to S404 is a deterioration of the original image represented by the decoded image data. Screenshots do not reproduce the original image with the same quality as the original image. Therefore, the situation where the original image is duplicated by the creation of the screen shot is prevented.

The configuration of the image distribution system is not limited to the above. For example, the image distribution system may include a plurality of image display terminals 3. Further, the content server 1 does not necessarily need to supply the image data to the image display terminal 3. For example, the user of the image display terminal 3 can store the image data that has been encrypted in advance and recorded on a recording medium such as a CD-ROM. Is obtained at the store and the external storage unit 3
3 may be installed. The data transmitted through the network for the purpose of authentication of the use of image data includes identification codes of the content server 1, the license server 2, and the image display terminal 3, the ID of the image data,
It is sufficient to include the encryption key.

The image display terminal 3 has a portable structure, and is provided with a mobile phone (for example, a mobile phone or a PHS).
(Personal Handyphone System), GSM (Grobal S
system for mobile communication)). in this case,
The transmitting and receiving unit 34 includes a wireless transmitter and a wireless receiver, and modulates a carrier in a predetermined format using information supplied from the control unit 31 according to an instruction of the control unit 31.
It is assumed that the obtained modulated wave is transmitted. The transmitting / receiving unit 34 receives a modulated wave representing information addressed to the image display terminal 3 (that is, a modulated wave obtained by modulating a carrier in a predetermined format using information addressed to the image display terminal 3). It is assumed that the information is demodulated and the information addressed to the image display terminal 3 obtained by the demodulation is supplied to the control unit 31. In this case, the image display terminal 3 may be connected to a network via a packet network. The packet network includes a base station and a telephone line used for mobile telephone communication, a server computer connected to the telephone line and the network, and the like. The transmission / reception unit 34 of the image display terminal 3
Receive the demodulated wave transmitted from the mobile station, demodulate it, and transmit the information obtained by the demodulation (ie, the information used when the image display terminal 3 modulates the carrier) to the network. The packet network receives information transmitted from the content server 1 or the license server 2 to the image display terminal 3, generates a modulated wave representing the received information, and transmits the modulated wave to the image display terminal 3. .

Further, the license server 2 receives information for payment (for example, a card number of a credit card used by a person who uses an image for payment) from the image display terminal 3 before transmitting the encryption key. When the payment information is received, the payment information is stored in the external storage unit 2.
3 and may transmit the encryption key to the image display terminal 3.

The image display terminal 3 determines in step S403
Is not limited to the above-described method. For example, the control unit 31 of the image display terminal 3 generates a plurality of dot data (separated dot data) representing different colors based on each dot data included in the image data decoded in step S402. It may be. The colors represented by the separated dot data are substantially the same as the colors indicated by the original dot data used to generate these separated dot data when these colors are sequentially replaced at the same position in a short time and displayed. Is a color that is perceived by a human as the color of In this case, the control unit 31 converts the decomposed dot data generated based on each dot data so that a plurality of decomposed dot data generated based on the same dot data do not overlap in the same group, It shall be classified into multiple groups. And
For each group, the pixels indicated by the separated dot data belonging to this group are arranged at substantially the same positions as the pixels indicated by the original dot data used to generate the separated dot data. Thereby, the decomposed image data is generated. As a result, as many decomposed image data as the number of groups are generated.

As a more specific method for generating the separated dot data, for example, the control unit 31 multiplies the value of each primary color component indicated by the dot data by x times (for each dot data included in the image data). x is an arbitrary natural number of 2 or more, and generates x pieces of separated dot data (first to xth separated dot data) representing the result of x division at an arbitrary ratio. (In this case, the average value of the intensity of each primary color component indicated by the x separated dot data is substantially equal to the intensity of the primary color component indicated by the original dot data.) Is composed of, for example, data representing the intensity of red (R component), data representing the intensity of green (G component), and data representing the intensity of blue (B component). The control unit 31 determines that the values of the R component, the G component, and the B component are 10
Based on the dot data of 0, 10, and 10, the first separated dot data in which the values of the R, G, and B components are 80, 12, and 14, respectively, and the values of the R, G, and B components are The second separated dot data 120, 8 and 6 are created in this order. Then, the control unit 31 converts the first separated dot data generated based on each dot data into a pixel indicated by each first separated dot data by using the original separated dot data used for generating the first separated dot data. The first decomposed image data is generated by arranging the pixels so as to be arranged at substantially the same position as the pixel indicated by the dot data. Further, by performing substantially the same processing as the processing for generating the first decomposed image data using the second decomposed dot data, the second decomposed image data is generated.

Alternatively, the control section 31 may generate as many pieces of separated dot data as the number of types of primary colors, representing the value of each primary color component indicated by each dot data included in the image data. . Specifically, for example, the control unit 31 determines that the values of the R component, the G component, and the B component are 10
Based on the dot data of 0, 10, and 10, the first separated dot data in which the values of the R, G, and B components are 100, 0, and 0 in order, and the R, G, and B components, respectively.
The second separated dot data in which the component values are 0, 10, and 0 in order, and the R component, G component, and B component values are 0,
You may make it produce | generate the 3rd separated dot data which are 0 and 10.

Alternatively, when the pixels included in the image data are arranged in a rectangular grid, the control unit 31 determines that the four vertices of the rectangle are adjacent to the “D” character included in the image data. The sum of the values of the same primary color components of the first to fourth original dot data is calculated by subtracting 4 from the four dot data (the first to fourth original dot data) that are adjacently arranged so as to occupy them. Four dot data (first to fourth cross-divided dot data) representing the result of the division may be generated. (In this case, the average value of the intensity of each primary color component indicated by the four cross-divided dot data is substantially equal to the average value of the intensity of the primary color component indicated by the original four dot data. However, the pixels represented by the first and fourth original dot data are arranged on the same diagonal, and the pixels represented by the second and third original dot data are also arranged on the same diagonal. The first and fourth cross divided dot data are generated so as to have substantially the same value as each other, and the second and third cross divided dot data are generated so as to have substantially the same value as each other. Shall be performed. Specifically, for example, the control unit 31 determines the values of the R component, the G component, and the B component based on four dot data in which the values of the R component, the G component, and the B component are 200, 50, and 80, respectively. Is 24 in order
The first and fourth cross-divided dot data of 0, 60 and 110, and the second and third cross-divided dot data of R, G and B component values of 160, 40 and 50, respectively. Generate. In this case, the control unit 3
1 is the k-th (k is 1, 2, 3 or 4) cross-divided dot data generated based on each dot data, and each k-th cross-divided dot data is the k-th cross-divided dot data. The k-th decomposed image data may be generated by arranging the pixels so as to be arranged at substantially the same position as the pixel indicated by the k-th original dot data used for the generation of the k-th original dot data.

The image display terminal 3 does not need to generate decomposed image data for the entire image represented by the decoded image data, but only decomposes a portion of the image represented by the decoded image data that satisfies a predetermined condition. Image data may be generated. Therefore, for example, among the decoded image data, the decomposed dot data may be generated only for the dot data representing a color that satisfies a predetermined condition, or a known image data may be generated for the image represented by the decoded image data. The contour extraction may be performed by the method, and the decomposed dot data may be generated only for the dot data representing the portion belonging to the inside of the extracted contour.

The image display terminal 3 acquires plaintext image data from the outside via the transmission / reception unit 34 and the input unit 35, and uses the acquired image data to execute steps S403 to S403.
04 may be performed. Further, the encrypted image data and the plaintext encryption key are obtained, the obtained image data is decrypted by using the obtained plaintext encryption key, and then the step S403 is performed by using the decrypted image data.
To 404 may be performed.

When the image display terminal 3 acquires plaintext image data and a plaintext encryption key from the outside via the input unit 35,
The image display terminal 3 does not necessarily need to include the transmission / reception unit 34 and does not need to be connected to the content server 1 or the license server 2. The input unit 35 is provided with a floppy (registered trademark) disk or an MO (Magneto Optical).
disk) or CD (Compact Disc)-ROM (Read Only Me)
mory) or the like to read data from a recording medium and
Recording medium drive device (for example, floppy disk drive, MO drive, CD-ROM
Drive etc.).

Although the embodiments of the present invention have been described above, the image display device and the image decomposing device according to the present invention can be realized using a normal computer system. In the server computer, the above-mentioned content server 1
(ROM, floppy disk, C) storing a program for executing the operation of the license server 2 and the license server 2.
D-ROM, etc.), and installing the program from a medium storing the above-mentioned image utilization program and a program for controlling the processing of the browser on a personal computer connected to the server computer, An image distribution system that executes the above processing can be configured. The image use program and the program for controlling the processing of the browser need not necessarily be recorded on the same medium, and these programs may be dispersedly recorded on a plurality of media.

Further, for example, the program may be posted on a bulletin board (BBS) of a communication network and distributed via the network. Further, for example, the content server 1 stores the image use program, and the image display terminal 3 (or a computer that performs the function of the image display terminal 3) downloads the image use program from the content server 1 via the network, and installs it on its own. You may make it. Then, by starting this program and executing it in the same manner as other application programs under the control of the OS, the above-described processing can be executed.

[0068]

As described above, according to the present invention, an image display device, an image decomposing device, and an image display method for utilizing content while preventing disorderly duplication of the content are realized. Further, according to the present invention, an image display device, an image decomposing device, and an image display method for preventing an image from being copied with high quality by creating a screen shot are realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an image distribution system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a basic configuration of the content server of FIG.

FIG. 3 is a block diagram showing a basic configuration of the license server of FIG. 1;

FIG. 4 is a block diagram illustrating a basic configuration of the image display terminal of FIG. 1;

FIG. 5 is a flowchart illustrating processing of a content server, a license server, and an image display terminal when a usage right is acquired.

FIG. 6 is a flowchart illustrating processing of the image display terminal when displaying an image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Content server 2 License server 3 Image display terminal 11,21,31 Control part 12,22,32 Main storage part 13,23,33 External storage part 14,24,34 Transmission / reception part 35 Input part 36 Display part

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 1/60 H04N 1/40 Z 5C082 1/46 D 5J104 // G09C 1/00 660 1/46 Z (72) Invention Person Kazunori Asada 3-2-1 Kitano 2-chome, Kiyota-ku, Sapporo, Hokkaido Inside the open loop Co., Ltd. 72) Inventor Isamu Iwamoto 2-2-1 Chuo-ku, Nakano-ku, Tokyo F-term in Webeye Co., Ltd. BD09 CA01 CA14 CB01 CC04 CC06 5C076 AA03 AA13 AA26 AA36 BA06 CA02 5C077 LL14 MP08 NP05 PP19 PP23 PP66 PQ08 PQ22 SS06 5C079 LA02 LA31 LA39 LA40 LB01 MA02 MA17 NA06 PA05 5C082 BA41 BB01 A01 OA15 BB15 CA81 AE15

Claims (10)

[Claims] 1. A method for acquiring original image data representing an original image, and a plurality of decompositions representing a plurality of decomposition images corresponding to a degraded version of the original image represented by the original image data based on the acquired original image data. Image decomposing means for generating image data, By sequentially replacing and displaying a plurality of decomposed images represented by each of the decomposed image data generated by the image decomposing means, an image substantially the same as the original image is displayed to a person. An image display device, comprising: image display means for visually recognizing the image. 2. The image decomposing means acquires and temporarily stores the original image data, generates the decomposed image data based on the temporarily stored original image data, and converts the temporarily stored original image data. The image display device according to claim 1, wherein the image is erased. 3. The original image data includes pixel data representing pixels constituting the original image, and the image decomposing means divides the pixel data included in the acquired original image data into a plurality of sets. The image display device according to claim 1, further comprising: a unit configured to generate the decomposed image data including each of the sets by sorting. 4. The original image data includes pixel color data representing a color of a pixel constituting the original image, and the image decomposing means converts the pixel color data included in the acquired original image data into And generating a plurality of separated pixel color data representing a plurality of colors such that a person can visually recognize a color substantially the same as the color represented by the pixel color data when displayed sequentially and based on the generated separated pixel. Color data
3. The apparatus according to claim 1, further comprising a unit configured to generate the decomposed image data by distributing a plurality of sets that represent the same pixel to a plurality of sets so as not to belong to the same set. 4. Image display device. 5. The pixel color data represents a color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components, and the image separation unit includes the pixel color data in the acquired original image data. A plurality of separated pixel color data representing the color represented by the pixel color data for each primary color component, and generating each of the separated pixel color data so that those representing the same primary color belong to the same set. The image display device according to claim 4, further comprising: means for sorting the plurality of sets. 6. The pixel color data represents a color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components. Means for generating a plurality of the separated pixel color data having a relationship such that an average value is substantially equal to the intensity of the primary color component represented by the pixel color data included in the original image data. The image display device according to claim 4, wherein 7. The pixel color data represents a color of a pixel constituting the original image as a combination of the intensities of a plurality of primary color components. The plurality of pixels having a relationship such that the average value is substantially equal to the average value of the intensity of the primary color component represented by each of the pixel color data included in the plurality of original image data representing the plurality of adjacent pixels. The image display device according to claim 4, further comprising: a unit configured to generate the separated pixel color data. 8. A means for acquiring original image data representing an original image, and, based on the acquired original image data, the original image represented by the original image data corresponds to a deteriorated original image. Means for generating a plurality of decomposed image data representing a plurality of decomposed images such that a person can visually recognize an image substantially the same as the original image. 9. Acquiring original image data representing an original image, and based on the acquired original image data, a plurality of decomposed images representing a plurality of decomposed images corresponding to degraded original images represented by the original image data. Image data is generated, and a plurality of decomposed images represented by each of the generated decomposed image data is sequentially replaced and displayed, thereby allowing a person to visually recognize an image substantially the same as the original image. Display method. 10. A computer obtains original image data representing an original image and, based on the acquired original image data, represents a plurality of decomposed images corresponding to degraded original images represented by the original image data. An image decomposing unit that generates a plurality of decomposed image data, and a plurality of decomposed images represented by each of the decomposed image data generated by the image decomposing unit are sequentially replaced and displayed, whereby an image substantially the same as the original image is displayed. Image display means for allowing humans to visually recognize, and a program for causing it to function.