JP2008306498A - Image display device and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an image of an object with the color same as when the object is directly recognized by human eyes. <P>SOLUTION: The image display apparatus 1 preliminarily stores color characteristic data with a difference from a color value representing a color displayed by a display (displaying means) 2, based on color data specifying a color value representing a standard color and a color data specifying the standard color, calculating a color value of an image from a color data included in received image data, corrects the color value using the difference so as to display a color represented by the calculated color value on the display 2, and displays an image on the display 2 based on a color data specifying a color represented by the corrected value. Further, in the image display apparatus 1, a luminance meter 17 measures brightness of the image displayed on the display 2, and corrects the color so as to cancel change of the color due to change of the brightness. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device that displays an image, and more particularly, to an image display device and a computer program that can display an image obtained by photographing an object in correct colors.

  The color of an object visible to the human eye is influenced by the environment in which the object is placed, such as the surface state of the object, the wavelength distribution of the light source, and the presence or absence of ambient light. In addition, when an object is photographed with a camera and the photographed image is displayed on an image display device, the camera has characteristics that characterize how much each color can be recorded, compared to when the object color is directly recognized by the human eye. The color of the displayed image changes according to the characteristics of the camera. Therefore, even if an image obtained by photographing an object is displayed on the image display device, it is difficult to evaluate the color of the object from the displayed image.

Patent Document 1 discloses a technique for evaluating the color of an object photographed by a camera from an image displayed by an image display device. In the technique of Patent Document 1, XYZ tristimulus values representing the color of an object in the XYZ color system, tristimulus values of a color target that appears to be the same color, the output of the camera that captured the color target, The relationship with the input to the image display device for displaying a color that appears to be the same color is obtained. Based on these relationships, the tristimulus value of the object can be estimated from the color of the image displayed on the image display device.
JP 2000-9534 A

  Incidentally, an image display apparatus used as a personal computer (PC) or a television receiver has color characteristics that characterize how each color is expressed. Currently, there are various types of image display devices such as those using CRT or liquid crystal as display elements, and the color characteristics differ depending on the type. Even in the same type of image display device, the color characteristics differ depending on the manufacturer or model. In image display apparatuses having different color characteristics, even when images based on the same image data are displayed, the colors of the displayed images are different from each other. In the technique of Patent Literature 1, the color characteristics of the image display device are not taken into consideration, and when an image display device having a color characteristic different from that of the image display device that obtains the relationship between the tristimulus value of the object and the input is used, This technique cannot be applied.

  When image data is transmitted via a communication network such as the Internet and an image is displayed on an unspecified number of image display devices based on the transmitted image data, the color characteristics are different for each image display device. The technology cannot be applied. Therefore, a user who has displayed an image based on image data received via the communication network on the image display device cannot know the actual color of the object shown in the image. For example, in mail order sales using a communication network, even if the product is purchased after confirming the product shown in the image, the color displayed on the image display device and the color of the actual product are different, leading to a sales trouble. There is a risk of doing.

  The present invention has been made in view of such circumstances, and the object of the present invention is equivalent to the case where an object is directly recognized by human eyes by performing color correction in accordance with color characteristics. An object of the present invention is to provide an image display device and a computer program that can display an image of an object in color.

  An image display apparatus according to the present invention is an image display apparatus comprising: a receiving unit that receives image data including color data that specifies a color; and a display unit that displays an image based on the image data received by the receiving unit. Means for storing information indicating a color shift between a color specified by color data and a color displayed by the display unit based on the color data, and a color shift indicated by the information, which is obtained in advance; And a means for correcting the color displayed by the display means based on color data included in the image data received by the receiving means.

  The image display device according to the present invention includes: a means for measuring the brightness of an image displayed by the display means; and the display means based on a phenomenon that a color changes according to the brightness of the image and is visible to a person. The display device further comprises means for correcting the color of the image displayed by the display means so as to cancel the color change that appears to change the color of the image according to the brightness of the image to be displayed.

  An image display apparatus according to the present invention is an image display apparatus comprising: a receiving unit that receives image data including color data that specifies a color; and a display unit that displays an image based on the image data received by the receiving unit. Storage means for storing a difference between a color value representing a predetermined standard color obtained in advance and a color value representing a color displayed by the display means based on color data specifying the standard color; and the reception Means for obtaining a color value representing the color specified by the color data included in the image data received by the means, and the obtained color value using the difference so that the color represented by the obtained color value can be displayed on the display means. Correction means for correcting, means for converting the color data included in the image data into color data for specifying the color represented by the corrected color value, and the display means based on the image data obtained by converting the color data by the means Characterized in that it comprises a means for displaying an image.

  An image display apparatus according to the present invention includes a unit that stores color change information indicating a color change of each color that is visible to human eyes by changing a color according to a change in brightness, and a brightness of an image displayed by the display unit. Means for measuring the brightness, means for determining the brightness of the image indicated by the image data received by the receiving means, and the brightness has changed from the brightness determined by the means to the brightness of the image displayed by the display means And color value specifying means for specifying a color value representing a color that causes a color change to the color indicated by the color data included in the image data, based on the color change information, and the correction means includes the color value. A feature is that the color value specified by the specifying means is corrected.

  In the image display device according to the present invention, the storage means is a display means based on a color value representing a predetermined standard color and color data specifying the standard color, which are obtained in advance for each of a plurality of types of display means. Stores a difference with a color value representing a color displayed by each of the display means in association with a plurality of types of display means, and accepts a selection of one type from among the plurality of display means types. And a means for acquiring the difference stored in the storage means in association with the type of the display means that received the information as a difference to be used by the correction means.

  A computer program according to the present invention is a computer program for causing a computer to display an image based on image data on a display means, and causing the computer to obtain a color value representing a color specified by color data included in the image data; The computer uses the difference between the color value representing a predetermined standard color and the color value representing the color displayed by the display unit based on the color data specifying the standard color to obtain the color represented by the obtained color value. A procedure for correcting the obtained color value so that it can be displayed on the display means; a procedure for causing the computer to convert the color data included in the image data into color data for specifying the color represented by the corrected color value; And a procedure for displaying an image on the display means based on the image data obtained by converting the color data.

  The computer program according to the present invention is a procedure for causing a computer to determine the brightness of an image indicated by image data, and when the brightness changes from the determined brightness to the brightness of an image displayed by the display means. Based on the color change information indicating the color change of each color visible to the human eye by changing the color according to the change in brightness, the color value representing the color that causes a color change to the color indicated by the color data included in the image data And a procedure for specifying the information.

  In the present invention, the image display device stores information indicating a color shift to be displayed, such as a difference between a color value representing a standard color and a color value representing a color displayed based on color data specifying the standard color. The image is displayed after correcting the color based on the information so as to eliminate the color shift. Thereby, the image display apparatus can display the color specified by the color data included in the image data.

  Further, in the present invention, the difference between the color value representing the standard color and the color value representing the color displayed based on the color data specifying the standard color is measured in advance, and the number of display means such as the difference between manufacturers is determined. A plurality of differences are stored in the image display device in association with each other, the type of the display unit is selected by the user's operation, and the color is corrected using the difference associated with the selected type of the display unit.

  Furthermore, in the present invention, the brightness of the image displayed by the display means is measured, the brightness of the color indicated by the color data included in the image data is obtained, and the color appears to change according to the change in brightness. Then, the color is corrected so as to cancel the color change due to the brightness change, and the image is displayed.

  In the present invention, the image display device displays an image in a color faithful to the image data received from the outside, so that an image obtained by photographing the object can be displayed in the same color as the object seen by the human eye. . Therefore, even when image data is received via a communication network such as the Internet, it is possible to display the image of the object in the same color as the actual object, and to prevent mail order sales troubles.

  Furthermore, in the present invention, no matter what brightness the display means displays an image by correcting the color so as to cancel the color change due to the change in brightness, the original image data The present invention has an excellent effect such that an image can be displayed in the same color as the generated color.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of an image display apparatus 1 according to Embodiment 1 of the present invention. The image display device 1 is configured by using a general-purpose computer such as a PC, and performs a calculation, a RAM 12 that stores temporary information generated along with the calculation, and a recording medium D such as a magnetic disk or an optical disk. A drive unit 13 such as a CD-ROM drive for reading information from a storage unit and a storage unit (storage means) 14 such as a hard disk are provided. The CPU 11 causes the drive unit 13 to read the computer program 10 of the present invention from the recording medium D, and stores the read computer program 10 in the storage unit 14. The computer program 10 is loaded from the storage unit 14 to the RAM 12 as necessary, and the CPU 11 executes processing necessary for the image display device 1 based on the loaded computer program 10.

  The image display apparatus 1 includes a display (display means) 2 such as a CRT display or a liquid crystal display (LCD), and an input such as a keyboard or a pointing device for inputting information such as various processing instructions operated by the user. Part 15. The display 2 and the input unit 15 are external devices that can be attached to and detached from the computer, and are connected to the CPU 11 via an input / output interface (not shown). The image display device 1 also includes a communication unit (reception unit) 16 that communicates with the outside. The communication unit 16 is connected to an external communication network such as the Internet, and receives image data transmitted from the outside via the communication network. The image display device 1 performs processing for displaying an image on the display 2 based on the image data received by the communication unit 16. Further, the image display device 1 includes a luminance meter 17 that measures the brightness of the image displayed on the display 2.

  The storage unit 14 stores color characteristic data representing a color characteristic in which the color of an image displayed on the display device 2 deviates from a color that should be originally displayed due to the characteristic of the display device 2. The color characteristics of the display device 2 are measured for the display device 2 of each model by the manufacturer of the display device 2 and stored in the storage unit 14.

  FIG. 2 is a conceptual diagram illustrating an example of a method for measuring the color characteristics of the display device 2. The display 2 is connected to the computer 21 and displays an image based on image data from the computer 21. There is a light source L that emits predetermined standard light such as standard illuminant A or D65, and the spectrocolorimeter 22 receives light from the light source L. The spectrocolorimeter 22 spectrally measures the color of the received light, and inputs the colorimetric result to the computer 21. Based on the input from the spectrocolorimeter 22, the computer 21 performs processing for analyzing the color measured by the spectrocolorimeter 22, that is, the color of standard light. The computer 21 creates image data including color data for specifying the analyzed color, and inputs the created image data to the display 2. The display 2 displays an image based on the image data input from the computer 21. Thereby, the display device 2 displays an image of standard light.

  Furthermore, there is another spectrocolorimeter 23. The spectrocolorimeter 23 receives the light of the image displayed on the display 2, spectrally measures the received light, and measures the colorimetric results. Input to 21. The color measured by the spectrocolorimeter 22 is the original color of the standard light, and the color measured by the spectrocolorimeter 23 is displayed on the display 2 based on color data specifying the color of the standard light. Color. The computer 21 obtains tristimulus values (color values) obtained by quantitatively expressing the colors measured by the spectral colorimeters 22 and 23 in the XYZ color system based on inputs from the spectral colorimeters 22 and 23. I do. Here, the color measured by the spectrocolorimeter 22, that is, the tristimulus value representing the color of the standard light is (X0, Y0, Z0), and the color measured by the spectrocolorimeter 23, that is, the display 2 Let (X, Y, Z) be the tristimulus values that represent the color actually displayed in order to display the standard light color. Usually, (X0, Y0, Z0) and (X, Y, Z) do not coincide with each other, and the color displayed by the display device 2 deviates from the color of the standard light. The computer 21 subtracts the tristimulus values (X0, Y0, Z0) of the standard light color from the tristimulus values (X, Y, Z) of the colors displayed on the display 2 to display the colors displayed on the display 2 A difference (ΔX, ΔY, ΔZ) of tristimulus values representing color characteristics that shift is obtained.

  The above process for obtaining the difference between the tristimulus values is performed by the manufacturer of the display 2 or a specific evaluation organization. The difference of tristimulus values is obtained for each manufacturer of the display device 2 and for each display method of the display device 2 such as CRT or LCD, and color characteristic data including the obtained difference of tristimulus values is distributed. FIG. 3 is a conceptual diagram showing an example of the contents of the color characteristic data. The difference of the determined tristimulus values is recorded in association with the manufacturer of the display 2 and the display method. Such color characteristic data is distributed, for example, in a form recorded on a recording medium such as a CD-ROM attached to the display 2 when the display 2 is sold, and the image display device 1 is recorded on the recording medium by the drive unit 13. The color characteristic data is read out from the data and stored in the storage unit 14. Further, the color characteristic data may be recorded on the recording medium D on which the computer program 10 is recorded. Further, the color characteristic data may be distributed via a communication network such as the Internet, and the image display apparatus 1 may store the color characteristic data received by the communication unit 16 in the storage unit 14.

  The storage unit 14 further stores color change information indicating the color change of each color according to the brightness due to the Besolt-Brücke phenomenon in which the color changes to the human eye when the brightness changes. FIG. 4 is a characteristic diagram showing a change in color on the spectrum due to the Besolt-Brucke phenomenon. The vertical axis in the figure indicates the logarithm of the luminance of the image, and the horizontal axis in the figure indicates the wavelength of light corresponding to the color visible to the human eye at each brightness. FIG. 4 shows that the wavelength increases as it goes upward in the vertical axis direction, and the wavelength of light corresponding to the color visible to the human eye changes along the curve in the figure when the brightness of the image changes. As shown in FIG. 4, the color change information stored in the storage unit 14 records information representing a color change according to the brightness of an image displayed on the display 2.

  Next, a usage form of the image display apparatus 1 having the above configuration will be described. FIG. 5 is a conceptual diagram showing a usage pattern of the image display device 1 of the present invention. The image display device 1 is connected to a communication network N such as the Internet. Specifically, the communication unit 16 is connected to the communication network N via a communication line, and the communication unit 16 transmits and receives information via the communication network N. A server device 4 such as a web server is connected to the communication network N. The server device 4 stores image data, and can transmit the image data to the image display device 1 via the communication network N. The image display device 1 receives the image data from the server device 4 by the communication unit 16 and causes the display 2 to display an image based on the received image data using an image display program such as a web browser.

  A PC 3 is also connected to the communication network N. The PC 3 is configured to transmit image data representing an image obtained by photographing some object B with the camera 30 to the server device 4 via the communication network N. The server device 4 stores the image data transmitted from the PC 3 and enables the image data to be transmitted to the image display device 1. For example, the object B is a product such as clothes, the user of the PC 3 is a seller of the product, the user of the image display device 1 is a buyer of the product, and the image display device 1 displays an image of the object B that is a product. By displaying, shopping via the communication network N becomes possible.

  Next, processing executed by the image display device 1 of the present invention will be described. FIG. 6 is a flowchart showing a procedure of image display processing performed by the image display apparatus 1 of the present invention. The CPU 11 of the image display device 1 executes the following processing according to the computer program 10 loaded into the RAM 12. When the user browses a shopping website using the image display device 1, the server device 4 transmits image data to the image display device 1 via the communication network N as necessary. Receives the image data by the communication unit 16 (S1). CPU11 memorize | stores the image data received by the communication part 16 in RAM12 or the memory | storage part 14, and displays the selection screen for selecting the color characteristic of the display 2 on the display 2 (S2).

  FIG. 7 is a schematic diagram illustrating an example of a selection screen. The CPU 11 reads the color characteristic data from the storage unit 14, causes the display unit 2 to display a list of display manufacturers and display methods in which the color characteristic data includes the difference of the tristimulus values, and the user operates the input unit 15. By doing so, it waits for acceptance of selection of a manufacturer and a display method (S3). In the selection screen shown in FIG. 7, a list of display manufacturers and display methods is displayed, and the user can select one combination on the selection screen using a mouse from a combination of a plurality of manufacturers and display methods. The combination of manufacturer and display method is selected by a method such as clicking. When the selection of the manufacturer and the display method is not received (S3: NO), the CPU 11 continues to wait for the selection reception. When the selection of the manufacturer and the display method is received by the input unit 15 (S3: YES), the CPU 11 determines the tristimulus values recorded in the color characteristic data in association with the selected manufacturer and the display method from the color characteristic data. The difference is acquired (S4).

  Next, the CPU 11 causes the luminance meter 17 to measure the luminance of the image displayed by the display device 2 (S5). At this time, the luminance meter 17 measures the amount of light including the ambient light of the display 2 in addition to the light emission of the display 2, so that the apparent luminance obtained by adding the illuminance due to the ambient light to the luminance of the display 2 Measure. The luminance measured by the luminance meter 17 does not need to measure different individual luminances at each part on the screen of the display device 2, and may be an average luminance obtained by averaging the entire screen of the display device 2. Further, the luminance meter 17 may be configured to measure the luminance of a part of the screen of the display device 2 as a representative value. The measurement result of the luminance meter 17 is stored in the RAM 12. Next, the CPU 11 calculates tristimulus values that quantitatively represent the color of each pixel constituting the image in the XYZ color system from the color data included in the received image data (S6). The color data corresponding to each pixel is, for example, data representing each emission intensity of R (red), G (green), and B (blue) in 8 bits, and is subjected to predetermined processing such as predetermined matrix conversion and gamma correction. The tristimulus value in which the color is expressed in the XYZ color system is obtained.

  Next, the CPU 11 calculates the original luminance at each pixel in the image based on the image data from the calculated tristimulus values of the XYZ color system (S7). The stimulus value Y among the tristimulus values of the XYZ color system corresponds to the colorimetric light quantity, and the original luminance at each pixel is obtained from the value of the stimulus value Yn calculated for the pixel. Next, the CPU 11 refers to the color change information stored in the storage unit 14 to express the tristimulus value when the brightness of the pixel changes from the original luminance to the luminance measured by the luminance meter 17. A color that appears to be the same color as the selected color is identified (S8). For example, when the luminance measured by the luminance meter 17 is larger than the original luminance, and the color represented by the calculated tristimulus values is purple, as shown in FIG. The color of blue rather than purple is specified so that it looks purple when it changes to the luminance measured by the luminance meter 17. Next, the CPU 11 calculates tristimulus values representing the specified color in the XYZ color system (S9).

  Next, the CPU 11 corrects the tristimulus value using the difference acquired in step S4 so that the color represented by the tristimulus value calculated in step S9 can be displayed on the display 2 (S10). For example, when the tristimulus value calculated in step S9 is (Xn, Yn, Zn) and the difference between the tristimulus values acquired in step S4 is (ΔX, ΔY, ΔZ), the CPU 11 The tristimulus values (Xn−ΔX, Yn−) can be displayed so that the colors of the tristimulus values (Xn, Yn, Zn) can be displayed in a situation where the colors are displayed with a difference (ΔX, ΔY, ΔZ) depending on the color characteristics. [Delta] Y, Zn- [Delta] Z).

  Next, the CPU 11 converts the color data of each pixel into color data specifying the color represented by the tristimulus values corrected in step S10 (S11), and displays the color data of each pixel based on the converted image data. An image is displayed on the device 2 (S12). Thus, the image display device 1 ends the process of displaying an image. Of the above processing, steps S2 and S3 need not be performed every time image data is received after the color characteristics of the display device 2 are selected once. Steps S2 and S3 are executed, the difference acquired in step S4 is stored in the RAM 12 or the storage unit 14, and the stored difference is read out as necessary, so that the processing in which steps S2 and S3 are omitted is executed thereafter. Can do.

  When an image is displayed on the display device 2, the color is displayed with a difference of the tristimulus values (ΔX, ΔY, ΔZ) from the color indicated by the color data included in the image data. Therefore, the color indicated by the original color data is displayed. By subtracting the difference from the tristimulus value in advance to correct the tristimulus value and displaying an image based on the color data specifying the color represented by the corrected tristimulus value, the color shift is eliminated, and the display 2 The color indicated by the original color data can be displayed. That is, the image display device 1 displays an image in a color faithful to the image data received from the server device 4. If the PC 3 is also an image display device of the present invention similar to the image display device 1, the PC 3 performs processing according to the color characteristics and displays an image, and the image is displayed according to an instruction from the user of the PC 3. By adjusting the, image data representing an image displayed in the same color as the object B viewed by the user of the PC 3 can be created. Further, the created image data is transmitted from the PC 3 to the server device 4, the image data is transmitted from the server device 4 to the image display device 1, and an image is displayed on the image display device 1. An image can be displayed in the same color as the object B viewed with eyes. Therefore, even when mail order is performed via the communication network N, the color of the object B, which is a product, as seen by the human eye and the color displayed on the image display device 1 are the same. Is prevented in advance.

  In the present invention, the color characteristics of the display device 2 are measured in advance by a manufacturer or an evaluation organization, and the user of the image display device 1 selects the image display device 1 only by selecting the manufacturer and display method of the display device 2. Since it can be adjusted, the user can view an image of a correct color without trouble. Further, according to the present invention, when the pixel brightness changes from the original luminance to the luminance of the display 2 with respect to the color change due to the Besolt-Brücke phenomenon in which the color appears to change according to the brightness change, By correcting the color of the image so that it looks the same color as the color, the image can be displayed in the same color as the color intended in the original image data. Therefore, no matter how bright the display 2 displays the image, the display 2 can display the image of the object B in the same color as the color of the object B viewed by the human eye.

  In the present embodiment, as color characteristic data representing the color characteristics of the display device 2, a difference (ΔX) between tristimulus values between a predetermined standard light color and a standard light image color displayed by the display device 2 is used. , ΔY, ΔZ) is shown, but the color characteristic data is not limited to this. For example, instead of using only the tristimulus value difference relating to the color of the standard light as the color characteristic data, the difference between the tristimulus values relating to a plurality of colors such as colors included in a predetermined color target may be used. . The difference between the tristimulus values relating to a plurality of colors is recorded in the color characteristic data, and the process of step S10 is performed using the difference corresponding to the color specified in step S8, so that the color of the image can be obtained with finer accuracy. It can be corrected. Further, instead of using the tristimulus value difference as the color characteristic data, information representing a color shift by an equation or a function may be used. The information of this mathematical expression or function is recorded in the color characteristic data, and the color of the image can be corrected by performing the process of correcting the tristimulus values in step S10 using this mathematical expression or function.

In the present embodiment, the color characteristic of the display device 2 is recorded in association with the manufacturer and the display method. However, the present invention is not limited to this. The form which records a color characteristic according to the kind of the fine display 2 may be sufficient. In the present embodiment, an example in which tristimulus values of the XYZ color system are used as color values that quantitatively represent colors is shown. However, in the present invention, the RGB color system, L ^* a ^* b ^{* is used.} Color values based on other color systems such as the color system or L ^* u ^* v ^* color system may be used.

  Moreover, in this Embodiment, although the brightness | luminance of the display 2 was measured and the form which performs the process which correct | amends a color according to the measured brightness | luminance was shown, the image display apparatus 1 of this invention respond | corresponded to the brightness | luminance. A form in which color correction is not performed may be employed. That is, the image display apparatus 1 of this embodiment does not execute the processes of steps S5 and S7 to S9, and performs a process of correcting the tristimulus values calculated in step S6 in step S10. In this embodiment, the present invention can be realized even when a PC that does not include the luminance meter 17 is used as the image display device 1.

(Embodiment 2)
In the first embodiment, an example in which the image display device of the present invention is configured using a general-purpose computer such as a PC is shown. However, in the second embodiment, various displays such as a television receiver or a PC display are used. 1 shows a mode in which the device operates alone as the image display device of the present invention. FIG. 8 is a block diagram showing an internal configuration of the image display device 5 according to the second embodiment of the present invention. The image display device 5 includes a control processing unit 51 including a processor that performs image processing, a RAM that stores information associated with the image processing, and a ROM that stores a control program. The control processing unit 51 includes a display unit 52 such as a liquid crystal panel that is a device for displaying an image, a ROM (storage unit) 53 that stores color characteristic data, and an input that receives image data input from the outside. An interface (reception unit) 54 is connected. The control processing unit 51 performs processing for displaying an image on the display unit 52 based on the image data input to the input interface 54.

  The color characteristic data stored in the ROM 53 stores information such as a tristimulus value difference indicating the color characteristic of the display unit 52. The color characteristics of the display unit 52 are measured by the same method as in the first embodiment, the color characteristic data for the display unit 52 is stored in the ROM 53, and the image display device 5 is shipped. When the image data is received by the input interface 54 (S1), the control processing unit 51 obtains the tristimulus value difference recorded in the color characteristic data (S4), and calculates the tristimulus value of the pixel from the image data ( (S6) By the same process as in the first embodiment, the tristimulus values are corrected using the acquired difference (S10), the color data of the image data is converted (S11), and the image is displayed on the display unit 52 (S11). S12). Through the above processing, even in the image display device 5 formed of a single display, the image of the object B can be displayed in the same color as the color of the object B viewed by human eyes.

  The image display device 5 may include a luminance meter that measures the luminance of the image displayed on the display unit 52. In the case of this form, by executing the processing of steps S5 and S7 to S9 in addition to the processing described above, the image display device 5 can display the object regardless of the brightness at which the display unit 52 displays an image. The image of the object B can be displayed in the same color as B is seen by human eyes.

It is a block diagram which shows the structure of the image display apparatus which concerns on Embodiment 1 of this invention. It is a conceptual diagram which shows the example of the method of measuring the color characteristic of a display. It is a conceptual diagram which shows the example of the content of color characteristic data. It is the characteristic view which showed the change of the color on the spectrum by the Besolt-Brucke phenomenon. It is a conceptual diagram which shows the utilization form of the image display apparatus of this invention. It is a flowchart which shows the procedure of the process of the image display which the image display apparatus of this invention performs. It is a schematic diagram which shows the example of a selection screen. FIG. 6 is a block diagram showing an internal configuration of an image display device according to the second embodiment of the present invention.

Explanation of symbols

1, 5 Image display device 10 Computer program 11 CPU
14 Storage unit (storage means)
15 input unit 16 communication unit (reception means)
17 Luminance meter 2 Display (display means)
51 Control Processing Unit 52 Display Unit (Display Unit)
53 ROM (storage means)
54 Input interface (receiving means)
D Recording medium

Claims (7)

In an image display apparatus comprising: a receiving unit that receives image data including color data that specifies a color; and a display unit that displays an image based on the image data received by the receiving unit.
Means for storing information indicating a color shift between a color determined in advance by color data and a color displayed by the display unit based on the color data;
An image display apparatus comprising: means for correcting a color displayed by the display unit based on color data included in the image data received by the reception unit so as to eliminate a color shift indicated by the information. . Means for measuring the brightness of an image displayed by the display means;
Based on the phenomenon that the color changes according to the brightness of the image and is visible to the human eye, the color change that appears to change the color of the image according to the brightness of the image displayed by the display means is offset. The image display apparatus according to claim 1, further comprising: a unit that corrects a color of an image displayed by the display unit. In an image display apparatus comprising: a receiving unit that receives image data including color data that specifies a color; and a display unit that displays an image based on the image data received by the receiving unit.
Storage means for storing a difference between a color value representing a predetermined standard color obtained in advance and a color value representing a color displayed by the display means based on color data specifying the standard color;
Means for obtaining a color value representing a color specified by color data included in image data received by the receiving means;
Correction means for correcting the obtained color value using the difference so that the color represented by the obtained color value can be displayed on the display means;
Means for converting the color data included in the image data into color data for specifying the color represented by the corrected color value;
An image display apparatus comprising: means for causing the display means to display an image based on image data obtained by converting the color data. Means for storing color change information indicating the color change of each color visible to the human eye by changing the color according to the change in brightness;
Means for measuring the brightness of an image displayed by the display means;
Means for determining brightness of an image indicated by image data received by the receiving means;
A color value representing a color that causes a color change to the color indicated by the color data included in the image data when the brightness changes from the brightness obtained by the means to the brightness of the image displayed by the display means, A color value specifying means for specifying based on the change information;
The image display apparatus according to claim 3, wherein the correcting unit is configured to correct the color value specified by the color value specifying unit. The storage means is obtained in advance for each of the plurality of types of display means, a color value representing a predetermined standard color, and a color value representing a color displayed by the display means based on color data specifying the standard color; Are stored in association with multiple types of display means,
Means for accepting one type of selection from a plurality of types of display means;
The means further comprising: means for acquiring the difference stored in the storage means in association with the type of display means for which the means accepts selection as a difference to be used in the correction means. 5. The image display device according to 4. In a computer program for causing a computer to display an image based on image data on a display means,
A procedure for causing a computer to obtain a color value representing a color specified by color data included in image data;
The computer uses the difference between the color value representing a predetermined standard color and the color value representing the color displayed by the display unit based on the color data specifying the standard color to obtain the color represented by the obtained color value. A procedure for correcting the obtained color value so that it can be displayed by a display means;
A procedure for causing the computer to convert the color data included in the image data into color data for specifying the color represented by the corrected color value;
A computer program comprising: causing a computer to display an image on the display unit based on image data obtained by converting color data. A procedure for causing the computer to determine the brightness of the image indicated by the image data;
When the brightness changes from the calculated brightness to the brightness of the image displayed by the display means, a color value representing a color that causes a color change to the color indicated by the color data included in the image data is calculated. The computer program according to claim 6, further comprising: a step of specifying the color based on color change information indicating a color change of each color that is visible to human eyes by changing the color according to the change.

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