JP6142648B2 - Image processing apparatus, image processing method, and program - Google Patents

Description

  The present invention relates to an image processing apparatus, an image processing method, and a program.

  As the prior art described in the publication, the user identifies the image data composed of at least three gradation levels, the display means for displaying the image data, and the appearance of the image data displayed on the display means. There is a display characteristic setting device including an input unit for inputting an identification result and a calculation unit for calculating a display characteristic of the display unit based on the identification result input by the input unit (see Patent Document 1).

  In Patent Document 1, a first image in which two kinds of gradation values are alternately arranged and a second image (solid image) having one kind of gradation values are brought into contact with each other and displayed on the display means. At this time, by displaying a plurality of second images having different gradation values together with the first image, which second image looks the same as the first image (actually, the first image The gradation characteristics of the display means are obtained based on what shape (for example, the so-called 7-segment numeric shape) the remaining second image that does not appear to be the same as the first image.

JP-A-9-305153

  An object of the present invention is to make it possible to more accurately grasp the shape of gradation characteristics in a display device.

According to the first aspect of the present invention, a reference for setting a first reference gradation value serving as a first reference and a second reference gradation value serving as a second reference and having a gradation different from that of the first reference gradation value. A setting means, a first comparison gradation value that is set based on the first reference gradation value and is a comparison target of the first reference gradation value, and is set based on the second reference gradation value; Comparison setting means for setting a second comparison gradation value to be compared with the second reference gradation value, a first reference image set to the first reference gradation value, and the first comparison gradation value Is set to the first reference image set so that one surrounds the other, the second reference image set to the second reference tone value, and the second comparison tone value. the second comparative image, with one image processing apparatus including a generation means for generating a second image disposed to surround the other That.

The invention according to claim 2 is characterized in that the comparison setting means sets a plurality of values as the first comparison gradation value, and sets a plurality of values as the second comparison gradation value. As the first image, the first reference image and a plurality of the first comparison images that are set to the respective values of the first comparison gradation value to make the gradations different from each other are arranged in the first image. As the second image, the second reference image and a plurality of the second comparison images having different gradations by being set to the respective values of the second comparison gradation values The image processing apparatus according to claim 1, wherein the second image is created side by side.
According to a third aspect of the present invention, the creating means makes the shapes of the plurality of first comparison images or the plurality of first reference images in the first image different from each other, and the plurality of the first images in the second image. The image processing apparatus according to claim 2, wherein each of the second comparative image or the plurality of first reference images has a different shape.
According to a fourth aspect of the present invention, the creating means irregularly arranges each of the plurality of first comparison images or the plurality of first reference images in the first image, and the plurality of first comparison images in the second image. The image processing apparatus according to claim 2, wherein each of the second comparison image or the plurality of second reference images is irregularly arranged.
According to a fifth aspect of the present invention, when the comparison setting means sets a plurality of values as the first comparison gradation value, all of the plurality of values constituting the first comparison gradation value are set to the first comparison gradation value. When a plurality of values are set as the second comparison gradation value by setting the reference gradation value to be larger or smaller than the reference gradation value, all of the plurality of values constituting the second comparison gradation value are set to the second reference gradation value. The image processing apparatus according to claim 2, wherein the image processing apparatus is set to be larger or smaller than the tone value.
A sixth aspect of the present invention is the image processing apparatus according to the first aspect, wherein the creating means arranges the first image and the second image side by side.
According to a seventh aspect of the present invention, the reference setting means sets the first reference gradation value to a gradation value exceeding half of all gradations, and sets the second reference gradation value to half of all gradations. The image processing apparatus according to claim 1, wherein the gradation value is set to be less than the gradation value.

The invention according to claim 8 is a step of setting a first reference gradation value serving as a first reference and a second reference gradation value serving as a second reference and having a gradation different from the first reference gradation value. And a first comparison tone value that is set based on the first reference tone value and is a comparison target of the first reference tone value, and is set based on the second reference tone value and the first reference tone value. Setting a second comparison gradation value to be compared with two reference gradation values, a first reference image set to the first reference gradation value, and a first comparison gradation value The first comparison image is arranged such that one surrounds the other, the second reference image set to the second reference tone value, and the second comparison set to the second comparison tone value An image processing method including a step of creating a second image in which one image surrounds the other .

The invention according to claim 9 is a step of displaying the first image and the second image on a display device after the step of creating the first image and the second image, and the step of displaying the first image and the second image on the display device. In the first image, whether or not the first reference image and the first comparison image can be identified visually is received, and in the second image displayed on the display device, the second reference image is received. And a step of accepting whether or not discrimination between the second comparison image and the second comparison image was visually possible, and a gradation shape in the display device based on the identification result in the first image and the identification result in the second image The image processing method according to claim 8 , further comprising:

According to a tenth aspect of the present invention, a first reference gradation value serving as a first reference and a second reference gradation value serving as a second reference and having a gradation different from the first reference gradation value are stored in a computer. A function to be set, a first comparison tone value that is set based on the first reference tone value and is a comparison target of the first reference tone value, and is set based on the second reference tone value And a function for setting a second comparison gradation value to be compared with the second reference gradation value, a first reference image set to the first reference gradation value, and the first comparison gradation value. The set first comparison image is set to the first image arranged so that one surrounds the other, the second reference image set to the second reference tone value, and the second comparison tone value the second comparative image, a program for realizing the function of one is to create a second image disposed to surround the other A.

According to the first aspect of the present invention, the shape of the gradation characteristic in the display device can be grasped more accurately as compared with the case where the present configuration is not provided.
According to the second aspect of the present invention, the shape of the gradation characteristic in the display device can be grasped more accurately as compared with the case where the present configuration is not provided.
According to the third aspect of the present invention, it is possible to suppress erroneous recognition by the operator as compared with the case where the present configuration is not provided.
According to invention of Claim 4, compared with the case where this structure is not provided, the misrecognition by an operator can be suppressed.
According to the fifth aspect of the present invention, it is possible to suppress erroneous recognition by the operator as compared with the case where the present configuration is not provided.
According to the sixth aspect of the present invention, it is possible to grasp the shape of the gradation in the display device with a smaller number of image display times than in the case where the present configuration is not provided.
According to the seventh aspect of the present invention, the shape of the gradation characteristic in the display device can be grasped more accurately as compared with the case where the present configuration is not provided.
According to the eighth aspect of the present invention, the shape of the gradation characteristic in the display device can be grasped more accurately than in the case where the present configuration is not provided.
According to the ninth aspect of the present invention, it is possible to grasp the shape of the gradation characteristic in the display device by visual confirmation of the image by the operator as compared with the case where the present configuration is not provided. .
According to the tenth aspect of the present invention, the shape of the gradation characteristic in the display device can be grasped more accurately as compared with the case where this configuration is not provided.

It is the figure which showed an example of the structure of the image display system to which embodiment of this invention is applied. It is the figure which showed the hardware constitutions of the computer apparatus. It is the figure which showed the function structural example of the test image data preparation part in a computer apparatus. It is the figure which showed the function structural example of the gradation shape specific | specification part in a computer apparatus. It is a flowchart which shows the process sequence in the gradation shape specific operation of a display apparatus. It is a flowchart for demonstrating the detailed procedure of test image data preparation. It is a flowchart for demonstrating the detailed procedure of gradation shape specification. It is a figure for demonstrating a reference | standard gradation value and a comparison gradation value. 6 is a diagram for describing a configuration example of a shape of an evaluation image in Embodiment 1. FIG. 6 is a diagram for describing an example of a test image displayed on a display device based on test image data in Embodiment 1. FIG. FIG. 5 is a diagram for explaining constituent elements of a test image in the first embodiment. It is a figure for demonstrating the structural example of the table for discrimination. It is a figure for demonstrating the example of a pattern of the gradation shape described in the table for discrimination | determination. FIG. 10 is a diagram showing another configuration example of a test image in the first embodiment. In Embodiment 2, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. FIG. 10 is a diagram for explaining constituent elements of a test image in the second embodiment. In Embodiment 3, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. In Embodiment 4, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. In Embodiment 5, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. In Embodiment 6, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. In Embodiment 7, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. FIG. 20 is a diagram for describing a configuration example of the shape of an evaluation image in the eighth embodiment. In Embodiment 8, it is a figure for demonstrating an example of the test image displayed on a display apparatus based on test image data. FIG. 25 is a diagram for describing a reference gradation value determination method according to the ninth embodiment.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Embodiment 1>
FIG. 1 is a diagram illustrating an example of a configuration of an image display system 10 to which the exemplary embodiment of the present invention is applied.
The image display system 10 includes a computer device 20 that creates image data for display, a display device 30 that displays an image based on the image data created by the computer device 20 on a display screen 31, and the computer device 20. And an input device 40 for receiving an input or the like.

  In the image display system 10, the computer device 20 and the display device 30 are connected via, for example, a DVI (Digital Visual Interface), and the computer device 20 and the input device 40 are connected via, for example, a USB (Universal Serial Bus). ing. The computer device 20 and the display device 30 may be connected via HDMI (High-Definition Multimedia Interface: registered trademark) or DisplayPort instead of DVI.

  The computer device 20 is a so-called general-purpose personal computer. The computer device 20 is configured to create image data and the like by operating various application software under the management of an OS (Operating System).

  Further, the display device 30 is configured by a device having a function of displaying an image by additive color mixing, such as a liquid crystal display for a PC, a liquid crystal television, or a projector. Therefore, the display method in the display device 30 is not limited to the liquid crystal method. 1 illustrates the case where a liquid crystal display for a PC is used as the display device 30, a display screen 31 is provided in the display device 30, but a projector is used as the display device 30, for example. In this case, the display screen 31 is a screen or the like provided outside the display device 30.

  Furthermore, the input device 40 is composed of, for example, a keyboard device or a mouse device.

  In the image display system 10, for example, an image based on display image data created using the input device 40 and the computer device 20 is displayed on the display screen 31 of the display device 30. Here, when product design or the like is performed using application software that operates on the computer device 20, it is required to display an image in a correct color on the display screen 31 in the display device 30. In particular, in the display device 30, due to the gradation characteristics unique to the display device 30, the gradation of each of the RGB colors may deviate from the target gradation, and as the gradation shifts, the image The color will also deviate from the target color.

  Therefore, in this image display system 10, a test image based on test image data created outside the computer device 20 or the computer device 20 is displayed on the display device 30 (display screen 31) using the computer device 20. A gradation shape specifying operation for specifying the gradation characteristics (gradation shape) of the display device 30 can be executed based on the result of the operator (user) visually reading the test image displayed on the device 30. It is like that. In the present embodiment, test image data is created in the computer device 20.

  The computer apparatus 20 according to the present embodiment is based on the test image data creation unit 21 that creates the test image used for the above-described gradation shape specifying operation and the test image data created by the test image data creation unit 21. A display image creation unit 22 composed of a video card or the like for creating a display image to be displayed on the display device 30, test image data created by the test image data creation unit 21, and a test image input via the input device 40 Based on the read result, a gradation shape specifying unit 23 that specifies the gradation shape of the display device 30, a storage unit 24 that stores various data used by the computer device 20 and various data created by the computer device 20, It has.

FIG. 2 is a diagram illustrating a hardware configuration of the computer apparatus 20.
The computer device 20 is realized by a personal computer or the like as described above. The computer device 20 includes a CPU (Central Processing Unit) 20a which is a calculation means, a main memory 20b and a HDD (Hard Disk Drive) 20c which are storage means. Here, the CPU 20a executes various programs such as an OS and application software. The main memory 20b is a storage area for storing various programs and data used for execution thereof, and the HDD 20c is a storage area for storing input data for various programs, output data from the various programs, and the like. Further, the computer device 20 includes a communication interface (hereinafter referred to as “communication I / F”) 20 d for performing communication with the outside including the input device 40 and the display device 30.

  As a form of provision relating to this program, there is a form in which the program is provided in a state stored in advance in the HDD 20c and loaded into the main memory 20b. Further, there is a form in which a program is transmitted to the computer device 20 via a network such as the Internet, installed in the HDD 20c via the communication I / F 20d, and loaded into the main memory 20b. Furthermore, there is a form in which the main memory 20b is loaded from an external recording medium such as a DVD-ROM or a flash memory.

FIG. 3 is a diagram showing a functional configuration example of the test image data creation unit 21 in the computer apparatus 20 shown in FIG.
The test image data creation unit 21 as an example of an image processing apparatus includes a reference tone value setting unit 211, a comparison tone value setting unit 212, an image shape setting unit 213, an image arrangement setting unit 214, and a test image generation. Part 215.

  The reference tone value setting unit 211 as an example of the reference setting unit is a reference tone value that serves as a reference for the tone value based on the input (instruction) received by the input device 40 in the above-described tone shape specifying operation. Set up. Here, the reference gradation value setting unit 211 of the present embodiment sets a plurality of values as the reference gradation. Details of the reference gradation value will be described later.

  In addition, the comparison gradation value setting unit 212 as an example of the comparison setting unit, each of a plurality of values constituting the reference gradation value set by the reference gradation value setting unit 211 in the above-described gradation shape specifying operation. Corresponding to the above, the comparison gradation value to be compared with the reference gradation value is set. Here, the comparative gradation value setting unit 212 of the present embodiment sets one or a plurality of values as comparative gradation values corresponding to each of a plurality of values constituting the reference gradation value. Details of the comparative gradation value will be described later.

  Furthermore, the image shape setting unit 213 sets the shape of the evaluation image to be evaluated by the operator in the above-described gradation shape specifying operation. Details of the evaluation image and the shape of the evaluation image will be described later.

  Furthermore, the image arrangement setting unit 214 sets the arrangement of the evaluation image in the test image in the above-described gradation shape specifying operation. Details of the arrangement of evaluation images will be described later.

  Then, the test image generation unit 215 as an example of a creation unit includes a reference tone value set by the reference tone value setting unit 211, a comparison tone value set by the comparison tone value setting unit 212, and an image shape setting. Based on the shape of the evaluation image set by the unit 213 and the arrangement of the evaluation image set by the image arrangement setting unit 214, the test image is displayed on the display screen 31 (see FIG. 1) of the display device 30. Test image data is generated. The test image data generated by the test image generating unit 215 is output to the display image generating unit 22 and the gradation shape specifying unit 23. Details of the test image will be described later.

FIG. 4 is a diagram illustrating a functional configuration example of the gradation shape specifying unit 23 in the computer apparatus 20 illustrated in FIG. 1.
The tone shape specifying unit 23 according to the present embodiment includes a discrimination table creation unit 231 and a tone shape discrimination unit 232.

  The discrimination table creation unit 231 creates a discrimination table used for specifying the tone shape based on the test image data input from the test image data creation unit 21 in the above-described tone shape specifying operation. . Details of the discrimination table will be described later.

  The gradation shape discriminating unit 232 is based on the discrimination table created by the discrimination table creation unit 231 and the reading result of the test image input via the input device 40, and the tone shape of the display device 30. Is determined. Note that a specific method for determining the gradation shape (specific method) will be described later.

  FIG. 5 is a flowchart showing a processing procedure in the gradation shape specifying operation of the display device 30. Note that the process shown in FIG. 5 (including the processes shown in FIGS. 6 and 7 described later) is performed for each color of RGB.

  In this process, first, the test image data creation unit 21 provided in the computer device 20 creates test image data (step 10). Subsequently, based on the test image data created in step 10, the display image creation unit 22 provided in the computer device 20 creates display image data, and outputs the created display image data to the display device 30. Then, a test image is displayed as a display image on the display device 30 (step 20). Then, the worker visually evaluates the test image displayed on the display screen 31 of the display device 30 and inputs the reading result (evaluation result) using the input device 40.

  Accordingly, the gradation shape specifying unit 23 of the computer device 20 receives an input of the evaluation result via the input device 40 (step 30). Then, the gradation shape specifying unit 23 of the computer device 20 specifies the gradation shape characteristics of the display device 30 based on the test image data created in step 10 and the evaluation result received in step 30 ( Step 40), a series of processing is completed.

FIG. 6 is a flowchart for explaining a detailed procedure for creating test image data shown in step 10 of FIG. Note that the process of creating test image data is performed by the test image data creating unit 21 shown in FIG. 3 as described above.
In creating the test image data, first, the reference gradation value setting unit 211 sets a reference gradation value based on an input (instruction) from the input device 40 (step 11). Next, the comparative gradation value setting unit 212 sets a comparative gradation value based on the reference gradation value created in Step 11 (Step 12). Subsequently, the image shape setting unit 213 sets the shape of the evaluation image in the test image (step 13), and the image arrangement setting unit 214 sets the arrangement of the evaluation image in the test image (step 14). Then, the test image generation unit 215 generates a test image (test image data) based on the reference gradation value, the comparison gradation value, the shape of the evaluation image, and the arrangement of the evaluation image (step 15), and a series of processes To complete.

FIG. 7 is a flowchart for explaining the detailed procedure for specifying the gradation shape shown in step 40 of FIG. Note that the processing for specifying the tone shape is performed by the tone shape specifying unit 23 shown in FIG. 4 as described above.
In specifying the gradation shape, first, the discrimination table creation unit 231 creates a discrimination table based on the test image data input from the test image data creation unit 21 (step 41). Next, the gradation shape discriminating unit 232 acquires the reading result (the number of identification images) of the test image input via the input device 40 (step 42). Then, the gradation shape determination unit 232 determines the gradation shape of the display device 30 based on the determination table created in step 41 and the number of identification images acquired in step 42 (step 43). , Complete a series of processing.

  Thereafter, the computer device 20 performs calibration (tone curve adjustment, etc.) on the display device 30 based on the gradation shape specified in step 43, and the correction value (gradation obtained) with the adjustment is obtained. (Correction value) is written in the display image creation unit 22 (video card) provided in the computer device 20, so that the gradation shift caused by the display device 30 is corrected.

  Here, the specific operation of the above-described gradation shape will be described with a specific example. In this description, it is assumed that the display device 30 expresses each RGB color with 8 bits, that is, 256 gradations (gradation values: 0 to 255).

FIG. 8 is a diagram for explaining the reference gradation value Gs set in step 11 and the comparison gradation value Gc set in step 12 shown in FIG.
In the present embodiment, as described above, a plurality of values are set as the reference gradation value Gs. In this example, two values, more specifically, the first reference gradation value Gs are set as the reference gradation value Gs. A value Gs1 and a second reference gradation value Gs2 are set. In this example, “192” is set as the first reference tone value Gs1, and “64” is set as the second reference tone value Gs2. Here, it is assumed that the first reference gradation value Gs1 and the second reference gradation value Gs2 are different from each other and selected from other than the lowest gradation value and the highest gradation value. Yes. In this example, the first reference gradation value Gs1 is set to a value (192) that is more than half of the 256 gradations and is approximately three-quarters (192), and the second reference gradation value Gs2 is the 256th floor. It is set to a value (64) that is less than half of the key and is almost a quarter. Other setting methods for a plurality of values constituting the reference gradation value Gs will be described later.

  Further, the comparative gradation value Gc of the present embodiment is determined based on the first comparative gradation value Gc1 determined based on the first reference gradation value Gs1 and the second reference gradation value Gs2. 2 comparative gradation values Gc2. Here, in the present embodiment, three values are set as the first comparative gradation value Gc1, and three values are set as the second comparative gradation value Gc2. More specifically, the first comparison gradation value Gc1 includes a first reference first comparison gradation value (hereinafter referred to as “1-1 comparison gradation value”) Gc11 and a first reference second comparison floor. A tone value (hereinafter referred to as “1-2 comparison tone value”) Gc12 and a first reference third comparison tone value (hereinafter referred to as “1-3 comparison tone value”) Gc13 are included. . On the other hand, the second reference gradation value Gc2 includes a second reference first comparison gradation value (hereinafter referred to as “2-1 comparison gradation value”) Gc21 and a second reference second comparison gradation value (hereinafter referred to as “2-1 comparison gradation value”). Gc22 (referred to as “2-2 comparison gradation value”) and a second reference third comparison gradation value (hereinafter referred to as “2-3 comparison gradation value”) Gc23.

  Here, the first comparison gradation value Gc1 (1-1 comparison gradation value Gc11, 1-2 comparison gradation value Gc12 and 1-3 comparison gradation value Gc13) is a value close to the first reference gradation value Gs1. In this case, the value is selected from a value larger than the first reference gradation value Gs1 or a value smaller than the first reference gradation value Gs1. For example, if the 1-1 comparison gradation value Gc11 is larger than the first reference gradation value Gs1, the 1-2 comparison gradation value Gc12 and the 1-3 comparison gradation value Gc13 are also the first reference gradation value Gs1. It becomes a larger value. On the other hand, for example, if the 1-1 comparison gradation value Gc11 is smaller than the first reference gradation value Gs1, the 1-2 comparison gradation value Gc12 and the 1-3 comparison gradation value Gc13 are also the first reference gradation value. The value is smaller than the value Gs1. However, the 1-1 comparison gradation value Gc11, the 1-2 comparison gradation value Gc12, and the 1-3 comparison gradation value Gc13 are different from each other. In this example, “194” is set as the 1-1 comparison tone value Gc11, “196” is set as the 1-2 comparison tone value Gc12, and “198” is set as the 1-3 comparison tone value Gc13. Is set. That is, in this example, the values (194 to 198) of the first comparison gradation value Gc1 (1-1 comparison gradation value Gc11, 1-2 comparison gradation value Gc12, and 1-3 comparison gradation value Gc13) are set. The first reference gradation value Gs1 (192) is set to a larger value.

  Further, the second comparison gradation value Gc2 (2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 and 2-3 comparison gradation value Gc23) is a value close to the second reference gradation value Gs2. Thus, a value larger than the second reference gradation value Gs2 or a value smaller than the second reference gradation value Gs2 is selected. For example, if the 2-1 comparison gradation value Gc21 is larger than the second reference gradation value Gs2, the 2-2 comparison gradation value Gc22 and the 2-3 comparison gradation value Gc23 are also the second reference gradation value Gs2. It becomes a larger value. On the other hand, for example, if the 2-1 comparison gradation value Gc21 is smaller than the second reference gradation value Gs2, the 2-2 comparison gradation value Gc22 and the 2-3 comparison gradation value Gc23 are also the second reference gradation value. The value is smaller than the value Gs2. However, the 2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 and 2-3 comparison gradation value Gc23 are different from each other. In this example, “66” is set as the 2-1 comparison tone value Gc21, “68” is set as the 2-2 comparison tone value Gc22, and “70” is set as the 2-3 comparison tone value Gc23. Is set. That is, in this example, the values (66 to 70) of the second comparison gradation value Gc2 (2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 and 2-3 comparison gradation value Gc23) are set. The second reference gradation value Gs2 (64) is set to a larger value.

  In this example, the first comparative gradation value Gc1 is set larger than the first reference gradation value Gs1, and the second comparative gradation value Gc2 is set larger than the second reference gradation value Gs2. However, it is not limited to this. For example, the first comparison gradation value Gc1 may be set larger than the first reference gradation value Gs1, the second comparison gradation value Gc2 may be set smaller than the second reference gradation value Gs2, or the first The comparative gradation value Gc1 may be set smaller than the first reference gradation value Gs1, the second comparative gradation value Gc2 may be set larger than the second reference gradation value Gs2, or the first comparative gradation value Gc1 may be set smaller than the first reference gradation value Gs1, and the second comparison gradation value Gc2 may be set smaller than the second reference gradation value Gs2.

  In this example, the gradation difference between the first reference gradation value Gs1 and the 1-1 comparison gradation value Gc11, and the gradation difference between the 1-1 comparison gradation value Gc11 and the 1-2 comparison gradation value Gc12. The gradation difference between the 1-2 comparison gradation value Gc12 and the 1-3 comparison gradation value Gc13 is set to “2”, but the present invention is not limited to this. For example, the gradation differences may not be equal. However, as will be described later, in this embodiment, the evaluation is performed using an evaluation image with a small gradation difference, so that the gradation difference is desirably about 10 at the maximum. This means that the second reference gradation value Gs2 and the second comparison gradation value Gc2 (2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 and 2-3 comparison gradation value Gc23) The same is true for the tone difference.

  FIG. 9 is a diagram for explaining a configuration example of the shape of the evaluation image Ie set in step 13 shown in FIG. In the present embodiment, as will be described later, a plurality of evaluation images Ie shown in FIG. 9 are arranged in one test image.

  The evaluation image Ie of the present embodiment has a background image Ib formed in a circular shape, a circular shape and a smaller diameter than the background image Ib, and the center position matches the background image Ib. And a foreground image If arranged to overlap the background image Ib. The foreground image If is in contact with the background image Ib and surrounded by the background image Ib.

In this example, the gradation of the background image Ib is set to any value selected from the reference gradation values Gs shown in FIG. 8, and the gradation of the foreground image If is the comparative gradation value Gc shown in FIG. Set to one of the values selected from. However, for example, when the gradation of the background image Ib is set to the first reference gradation value Gs1, the gradation of the foreground image If is the 1-1 comparison gradation value Gc11, 1 constituting the first comparison gradation value Gc1. -2 comparison gradation value Gc12 or 1-3 comparison gradation value Gc13, for example, when the gradation of the background image Ib is set to the second reference gradation value Gs2, the gradation of the foreground image If is the second The comparison gradation value Gc2 is set to the 2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 or 2-3 comparison gradation value Gc23. Accordingly, in the evaluation image Ie, the gradation difference between the background image Ib and the foreground image If is set to be small (in this example, the gradation difference is 6 at the maximum), so the background image Ib and the foreground image If It is difficult to discriminate.
The configuration of the evaluation image Ie is not limited to this. For example, the gradation of the foreground image If is selected from the reference gradation value Gs, and the gradation of the background image Ib is selected from the comparison gradation value Gc. It doesn't matter.

FIG. 10 is a diagram for explaining an example of the test image It displayed on the display device 30 (display screen 31) based on the test image data created in step 15 shown in FIG.
FIG. 11 is a diagram for explaining the components of the test image It shown in FIG.

  The test image It of the present embodiment includes the first test image It1 created based on the first reference gradation value Gs1 and the first comparison gradation value Gc1, the second reference gradation value Gs2, and the second comparison floor. A second test image It2 created based on the tone value Gc2 and a third test image It3 serving as the background of the entire first test image It1 and second test image It2 are included.

  In the test image It shown in FIG. 10, the evaluation images Ie shown in FIG. 9 are arranged in three rows horizontally and two rows vertically (3 × 2 = 6). Among these, on the display screen 31, the evaluation images Ie arranged side by side in the upper stage become the first test image It1, and the evaluations arranged side by side in the lower stage as viewed from the first test image It1. The image Ie becomes the second test image It2.

  First, a first test image It1 as an example of the first image includes a first test first evaluation image (hereinafter referred to as “1-1 evaluation image”) Ie11 and a first test second in order from the left side in the drawing. An evaluation image (hereinafter referred to as “1-2 evaluation image”) Ie12 and a first test third evaluation image (hereinafter referred to as “1-3 evaluation image”) Ie13 are included. Here, the 1-1 evaluation image Ie11 includes a first test first background image (hereinafter referred to as “1-1 background image”) Ib11 serving as a background and a first test first foreground image (hereinafter referred to as “1-1 background image”). If11) (referred to as “1-1 foreground image”). In addition, the 1-2 evaluation image Ie12 includes a first test second background image (hereinafter referred to as “1-2 background image”) Ib12 serving as a background and a first test second foreground image (hereinafter referred to as “1-2”). If12) referred to as “1-2 foreground image”. Further, the 1-3 evaluation image Ie13 includes a first test third background image (hereinafter referred to as “1-3 background image”) Ib13 as a background and a first test third foreground image (hereinafter referred to as “1-3 background image”). If13) referred to as “1-3 foreground image”.

  In the 1-1 evaluation image Ie11, the gradation of the 1-1 background image Ib11 is set to the first reference gradation value Gs1, and the gradation of the 1-1 foreground image If11 is set to the 1-1 comparison gradation value Gc11. The In the 1-2 evaluation image Ie12, the gradation of the 1-2 background image Ib12 is set to the first reference gradation value Gs1, and the gradation of the 1-2 foreground image If12 is set to the 1-2 comparison gradation value Gc12. Is set. Further, in the 1-3 evaluation image Ie13, the gradation of the 1-3 background image Ib13 is set to the first reference gradation value Gs1, and the gradation of the 1-3 foreground image If13 is set to the 1-3 comparison gradation value Gc13. Is set. Thus, in the three evaluation images Ie constituting the first test image It1, the gradation of the background image Ib is set to a common value, while the gradation of the foreground image If is set to a different value. . In the present embodiment, among the first test images It1 as an example of the first image, each background image Ib (1-1 background image Ib11, 1-2 background image Ib12 and 1-3 background image Ib13) is included. As the first reference image, each foreground image If (1-1 foreground image If11, 1-2 foreground image If12 and 1-3 foreground image If13) functions as a first comparison image.

  On the other hand, the second test image It2 as an example of the second image includes a second test first evaluation image (hereinafter referred to as “2-1 evaluation image”) Ie21 and a second test in order from the left side in the drawing. A second evaluation image (hereinafter referred to as “2-2 evaluation image”) Ie22 and a second test third evaluation image (hereinafter referred to as “2-3 evaluation image”) Ie23 are included. Here, the 2-1 evaluation image Ie21 includes a second test first background image (hereinafter referred to as “2-1 background image”) Ib21 serving as a background and a second test first foreground image (hereinafter referred to as “2-1 background image”). If21) (referred to as “2-1 foreground image”). Further, the 2-2 evaluation image Ie22 includes a second test second background image (hereinafter referred to as “2-2 background image”) Ib22 serving as a background and a second test second foreground image (hereinafter referred to as “2-2”). If22) referred to as “2-2 foreground image”. Further, the 2-3 evaluation image Ie23 includes a second test third background image (hereinafter referred to as “2-3 background image”) Ib23 serving as a background and a second test third foreground image (hereinafter referred to as “2-3 background image”). If23) referred to as “2-3 foreground image”.

  In the 2-1 evaluation image Ie21, the gradation of the 2-1 background image Ib21 is set to the second reference gradation value Gs2, and the gradation of the 2-1 foreground image If21 is set to the 2-1 comparison gradation value Gc21. The In the 2-2 evaluation image Ie22, the gradation of the 2-2 background image Ib22 is set to the second reference gradation value Gs2, and the gradation of the 2-2 foreground image If22 is set to the 2-2 comparison gradation value Gc22. Is set. Further, in the 2-3 evaluation image Ie23, the gradation of the 2-3 background image Ib23 is set to the second reference gradation value Gs2, and the gradation of the 2-3 foreground image If23 is set to the 2-3 comparison gradation value Gc23. Is set. As described above, also in the three evaluation images Ie constituting the second test image It2, the gradation of the background image Ib is set to a common value, while the gradation of the foreground image If is set to a different value. . In the present embodiment, among the second test image It2 as an example of the second image, each background image Ib (2-1 background image Ib21, 2-2 background image Ib22 and 2-3 background image Ib23) is included. As the second reference image, each foreground image If (2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image If23) functions as a second comparison image.

  On the other hand, the third test image It3 is set to a single gradation. In this example, the third test image It3 has white (W), that is, RGB gradation values set to (255, 255, 255).

  In the gradation shape specifying operation of the present embodiment, by displaying the test image It shown in FIG. 10 on the display screen 31 of the display device 30, the test image It that takes into consideration the characteristics unique to the display device 30 is obtained. Present to the worker. Then, the operator visually observes the test image It displayed on the display screen 31, and three evaluation images Ie (1-1 evaluation image Ie11, 1-2 evaluation image Ie12 constituting the first test image It1 are displayed. And 1-3 evaluation images Ie13), the number of images (hereinafter referred to as identification images) in which the background image Ib and the foreground image If could be identified (the gradation difference could be recognized visually) is referred to as the input device. Use 40 to enter. Further, the worker selects the background image Ib and the foreground image among the three evaluation images Ie (2-1 evaluation image Ie21, 2-2 evaluation image Ie22 and 2-3 evaluation image Ie23) constituting the second test image It2. The number of identification images that can be identified from If is input using the input device 40.

  FIG. 12 is a diagram for explaining a configuration example of the discrimination table created in step 41 shown in FIG.

  The discrimination table of the present embodiment is based on the number of evaluation images Ie constituting the first test image It1 and the number of evaluation images Ie constituting the second test image It2 described in the test image data. Determined. Since the determination table shown in FIG. 12 corresponds to the test images shown in FIGS. 10 and 11, the number of evaluation images Ie constituting the first test image It1 is 3, and the second The number of evaluation images Ie constituting the test image It2 is also three.

  The discrimination table shown in FIG. 12 includes the number (number) of identification images that can be distinguished from the background image Ib and the foreground image If in the first test image It1, and the background image Ib and the foreground image If in the second test image It2. The number (number) of identification images that can be identified with the gradation shape discrimination result is associated with each other. In this example, the number of identification images in the first test image It1 ranges from 0 to 3, and the number of identification images in the second test image It2 also ranges from 0 to 3.

  In this example, when the number of identification images in the first test image It1 is “0” and the number of identification images in the second test image It2 is “0” (hereinafter referred to as [0: 0]). ), The gradation shape is discriminated as the pattern A. [0: 1], [0: 2], [0: 3], [1: 0], [1: 1], [1: 2], [2: 0], [2: 1] Also in this case, the gradation shape is determined as the pattern A. In this example, the gradation shape is determined to be pattern B when [1: 3], [2: 2], and [3: 1]. Further, in this example, when [2: 3], [3: 0], [3: 2], and [3: 3], the gradation shape is determined as the pattern C.

  FIG. 13 is a diagram for explaining a pattern example of the gradation shape described in the discrimination table shown in FIG. FIG. 13 shows the patterns A, B, and C shown in FIG. In each of the patterns A to C, the horizontal axis represents the gradation value (0 to 255), and the vertical axis represents the relative luminance obtained by normalizing the entire luminance with the luminance when the gradation value is 255.

  Among these patterns, the pattern A has a gradient of brightness in both the low gradation area (area where the gradation value is close to 0) and the high gradation area (area where the gradation value is close to 255). This is a so-called S-shaped gradation shape that is smaller (sleeps) than the gradient of brightness in a region where the tone value is close to 128.

  In Pattern B, the luminance gradient in the high gradation region is larger (standing) than the luminance gradient in the middle gradation region, and the luminance gradient in the middle gradation region is larger than the luminance gradient in the low gradation region. This is a so-called exponential gradation shape.

  Furthermore, the pattern C has a so-called inverted S-shaped gradation shape in which the luminance gradient in both the low gradation region and the high gradation region is larger (standing) than the luminance gradient in the medium gradation region. Yes.

  In the present embodiment, the first reference gradation value Gs1 and the second reference gradation value Gs2 are set as the reference gradation value Gs, and the first comparison gradation value Gc1 is set for the first reference gradation value Gs1. The second comparative gradation value Gc2 is set for the second reference gradation value Gs2. Then, a first test image It1, which is a combination of the first reference gradation value Gs1 and the first comparison gradation value Gc1, and a second combination of the second reference gradation value Gs2, and the second comparison gradation value Gc2. The test image It including the two test images It2 is displayed on the display screen 31 of the display device 30. Then, an input of the number of identification images in the first test image It1 and the number of identification images in the second test image It2 by the operator is accepted.

  Thus, in the present embodiment, two points of the first reference gradation value Gs1 and the second reference gradation value Gs2 are added to the two points of the lowest gradation value = 0 and the highest gradation value = 255. Based on this, the gradation shape of the display device 30 can be specified. As a result, for example, in addition to the relatively simple gradation shape shown by pattern B in FIG. 13, it becomes possible to grasp a relatively complicated gradation shape shown by pattern A or pattern C in FIG. . Therefore, it is possible to bring the gradation shape of the display device 30 obtained based on the result of human observation closer to the target gradation characteristic without using a complicated and expensive measuring instrument. .

  Therefore, in the display device 30 in which the tone correction is performed based on the obtained tone shape, the tone characteristics unique to the display device 30 are canceled out along with the tone correction, which is the target. It is possible to display an image that reproduces the gradation characteristics.

  In particular, in the present embodiment, the 1-1 comparison gradation value Gc11, the 1-2 comparison gradation value Gc12, and the 1-3 comparison gradation value Gc13 are set as the first comparison gradation value Gc1, and the second comparison gradation value Gc1 is set. As the comparison gradation value Gc2, the 2-1 comparison gradation value Gc21, 2-2 comparison gradation value Gc22 and 2-3 comparison gradation value Gc23 are set. Thereby, compared with the case where one value is set as each of the first comparative gradation value Gc1 and the second comparative gradation value Gc2, the gradation shape of the display device 30 obtained based on the result of visual observation by a human is obtained. Thus, it becomes possible to approach the target gradation characteristics.

  Here, two values, that is, the first reference tone value Gs1 and the second reference tone value Gs2 are set as the reference tone value Gs, but by setting three or more values, It becomes possible to make the gradation shape of the display device 30 obtained based on the result of visual observation by a human closer to the target gradation characteristic.

  In the present embodiment, the evaluation image Ie constituting each of the first test image It1 and the second test image It2 in the test image It has a so-called double round shape, but is not limited thereto. .

FIG. 14 is a diagram showing another configuration example of the test image It in the present embodiment.
The basic configuration of the test image It shown in FIG. 14 is the same as that shown in FIG. 10, but the shape of the foreground image If in the six evaluation images Ie constituting the test image It is the same as that shown in FIG. Different.

  In the first test image It1, the 1-1 foreground image If11 constituting the 1-1 evaluation image Ie11 is formed in an alphabet “a” shape, and the 1-2 foreground image If12 constituting the 1-2 evaluation image Ie12 is formed in the alphabet. The 1-3 foreground image If13 that constitutes the 1-3 evaluation image Ie13 in the “b” shape is set in the letter “c” shape. Further, in the second test image It2, the 2-1 foreground image If21 constituting the 2-1 evaluation image Ie21 is formed in an alphabet “d” shape, and the 2-2 foreground image If22 constituting the 2-2 evaluation image Ie22 is The 2-3 foreground images If23 constituting the 2-3 evaluation image Ie23 are set in the alphabet “e” shape, respectively, in the alphabet “f” shape.

  Here, 1-1 background image Ib11 constituting the 1-1 evaluation image Ie11, 1-2 background image Ib12 constituting the 1-2 evaluation image Ie12, and 1-3 background image Ib13 constituting the 1-3 evaluation image Ie13. 2-1 background image Ib21 constituting the 2-1 evaluation image Ie21, 2-2 background image Ib22 constituting the 2-2 evaluation image Ie22, and 2-3 background image Ib23 constituting the 2-3 evaluation image Ie23 Are set in a circular shape as in FIG. Also in this example, the foreground image If is in contact with the background image Ib and surrounded by the background image Ib.

  When such an image is adopted as the test image It, the operator can distinguish between the background image Ib and the foreground image If (gradation of gradation) as compared with an image in which figures are combined as shown in FIG. In some cases, it is possible to further improve identification.

<Embodiment 2>
The basic configuration of the present embodiment is almost the same as that of the first embodiment, but the configuration of the test image It is different from that of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 15 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the second embodiment.
FIG. 16 is a diagram for explaining the components of the test image It shown in FIG.

  The test image It of the present embodiment includes the first test image It1 created based on the first reference gradation value Gs1 and the first comparison gradation value Gc1, the second reference gradation value Gs2, and the second comparison floor. And a second test image It2 created based on the tone value Gc2. In the example shown in FIGS. 15 and 16, unlike the first embodiment, the test image It does not have the third test image It3.

  In the test image It shown in FIG. 15, on the display screen 31, the first test image It1 is arranged at the upper stage, and the second test image It2 is arranged at the lower stage of the first test image It1.

  First, the first test image It1 includes a first foreground image If1 including a 1-1 foreground image If11, a 1-2 foreground image If12, and a 1-3 foreground image If13 arranged in order from the left side in the drawing, and a 1-1 foreground. The first background image Ib1 that is the background of the entire image If11, 1-2 foreground image If12, and 1-3 foreground image If13.

  In the first test image It1, the first background image Ib1 is set in a horizontally long rectangular shape, and 1-1 foreground image If11, 1-2 foreground image If12 and 1-3 foreground image constituting the first foreground image If1. If13 is set in a circular shape having a common diameter. The 1-1 foreground image If11, the 1-2 foreground image If12, and the 1-3 foreground image If13 constituting the first foreground image If1 are in contact with the first background image Ib1 and surrounded by the first background image Ib1. It has become.

  In this example, the gradation of the first background image Ib1 constituting the first test image It1 is set to the first reference gradation value Gs1. Further, in the first foreground image If1 constituting the first test image It1, the gradation of the 1-1 foreground image If11 is 1-1 and the gradation of the 1-2 foreground image If12 is 1-2. For the comparative gradation value Gc12, the gradation of the 1-3 foreground image If13 is set to the 1-3 comparative gradation value Gc13, respectively.

  Next, the second test image It2 includes a second foreground image If2 including a 2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image If23 arranged in order from the left side in FIG. The foreground images If21 and 2-2 have foreground images If22 and 2-3 foreground images If23 as second background images Ib2.

  In the second test image It2, the second background image Ib2 is set in a horizontally long rectangular shape, and the 2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image constituting the second foreground image If2. If23 is set in a circular shape having a common diameter. Then, the 2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image If23 constituting the second foreground image If2 are in contact with the second background image Ib2 and surrounded by the second background image Ib2. It has become.

  In this example, the gradation of the second background image Ib2 constituting the second test image It2 is set to the second reference gradation value Gs2. In the second foreground image If2 constituting the second test image It2, the gradation of the 2-1 foreground image If21 is 2-1 comparative gradation value Gc21, and the gradation of the 2-2 foreground image If22 is 2-2. The gradation of the 2-3 foreground image If23 is set to the 2-3 comparison gradation value Gc23, respectively, as the comparison gradation value Gc22.

  In this example, the lower side of the first background image Ib1 constituting the first test image It1 and the upper side of the second background image Ib2 constituting the second test image It2 are in contact with each other. The third test image It3 is not necessary.

  Here, the first test image It1 shown in FIG. 15 can be regarded as a three-dimensional arrangement of the background image Ib in the evaluation image Ie shown in FIG. Further, the second test image It2 shown in FIG. 15 can also be regarded as one in which the background image Ib in the evaluation image Ie shown in FIG.

  Even when such a configuration is adopted as the test image It, the same effects as those of the first embodiment can be obtained.

<Embodiment 3>
The basic configuration of the present embodiment is almost the same as that of the second embodiment, but the configuration of the test image It is different from that of the second embodiment. In the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 17 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the third embodiment.
In the second embodiment, in the test image It, the first test image It1 and the second test image It2 are displayed together on the time axis. On the other hand, in the present embodiment, the first test image It1 and the second test image It2 are displayed at different timings on the time axis.

  FIG. 17A is a diagram showing the first test image It1 displayed on the display screen 31. FIG. Here, the configuration of the first test image It1 is the same as that described in the second embodiment except that the first test image It1 is displayed on the entire display screen 31.

  FIG. 17B is a diagram showing a second test image It2 displayed on the display screen 31 following the first test image It1. Here, the configuration of the second test image It2 is the same as that described in the second embodiment except that the second test image It2 is displayed on the entire display screen 31.

Even when such a configuration is adopted as the test image It, the same effects as those of the first and second embodiments can be obtained.
Here, the second test image It2 is displayed on the display screen 31 after the first test image It1 is displayed. However, the present invention is not limited to this, and the display order may be reversed. Good.

<Embodiment 4>
The basic configuration of the present embodiment is substantially the same as that of the third embodiment, but the configuration of the test image It is different from that of the third embodiment. In the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 18 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the fourth embodiment.
In the third embodiment, a plurality of foreground images If (1-1 foreground image If11, 1-2 foreground image If12 and 1-3 foreground image If13) constituting the first test image It1, and the second test image It2 are obtained. A plurality of foreground images If (2-1 foreground images If21, 2-2, foreground images If22 and 2-3 foreground images If23) are set in a circular shape having a common diameter. On the other hand, in the present embodiment, the individual foreground images If are set in different shapes.

  FIG. 18A is a diagram showing a first test image It1 displayed on the display screen 31. FIG. Here, the configuration of the first test image It1 is set such that the 1-1 foreground image If11 is a regular triangle, the 1-2 foreground image If12 is a square, and the 1-3 foreground image If13 is a regular pentagon. This is the same as that described in the third embodiment.

  FIG. 18B is a diagram showing a second test image It2 displayed on the display screen 31 following the first test image It1. Here, the configuration of the second test image It2 is arranged such that the 2-1 foreground image If21 is a rhombus, the 2-2 foreground image If22 is a regular hexagon, and the 2-3 foreground image If23 is a regular octagon. This is the same as that described in the third embodiment.

Even when such a configuration is adopted as the test image It, it is possible to obtain the same effects as those of the first to third embodiments.
Here, the second test image It2 is displayed on the display screen 31 after the first test image It1 is displayed. However, the present invention is not limited to this, and the display order may be reversed. Good. Further, the shape of each foreground image is not limited to a polygonal shape, and may be a sector shape or a free shape.

<Embodiment 5>
The basic configuration of the present embodiment is substantially the same as that of the third embodiment, but the configuration of the test image It is different from that of the third embodiment. In the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 19 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the fifth embodiment.
In Embodiment 3, a plurality of first foreground images If1 (1-1 foreground image If11, 1-2 foreground image If12 and 1-3 foreground image If13) constituting the first test image It1, and the second test image A plurality of second foreground images If2 (2-1 foreground images If21, 2-2, foreground images If22 and 2-3 foreground images If23) constituting It2 are regularly arranged and displayed on the display screen 31. On the other hand, in the present embodiment, the individual foreground images If are set to be displayed irregularly on the display screen 31.

  FIG. 19A is a diagram showing the first test image It1 displayed on the display screen 31. FIG. Here, the configuration of the first test image It1 is the same as that of Embodiment 3 except that the 1-1 foreground image If11, the 1-2 foreground image If12, and the 1-3 foreground image If13 are irregularly arranged. Same as described.

  FIG. 19B is a diagram showing a second test image It2 displayed on the display screen 31 following the first test image It1. Here, the configuration of the second test image It2 is the same as that of Embodiment 3 except that the 2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image If23 are irregularly arranged. Same as described. In this example, the arrangement of the foreground images If in the first test image It1 and the second test image It2 is changed.

Even when such a configuration is adopted as the test image It, the same effects as those of the first embodiment can be obtained. In addition, by performing setting so that the foreground image If is displayed at a different position each time, it is possible to prevent the operator from determining that the image can be identified by assumption (incorrect determination).
Here, the second test image It2 is displayed on the display screen 31 after the first test image It1 is displayed. However, the present invention is not limited to this, and the display order may be reversed. Good.

<Embodiment 6>
The basic configuration of the present embodiment is almost the same as that of the second embodiment, but the configuration of the test image It is different from that of the second embodiment. In the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 20 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the sixth embodiment.
In the second embodiment, the first foreground image If1 (1-1 foreground image If11, 1-2 foreground image If12, and 1-3 foreground image If13) constituting the first test image It1 is arranged side by side, and the first The first background image Ib1 is arranged behind the foreground image If1, and the second foreground image If2 (2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground constituting the second test image It2) The image If23) is arranged side by side, and the second background image Ib2 is set behind the second foreground image If2. On the other hand, in the present embodiment, the first background image Ib1 set in common for the 1-1 foreground image If11, the 1-2 foreground image If12, and the 1-3 foreground image If13 corresponds to each. It is divided into 1-1 background image Ib11, 1-2 background image Ib12, and 1-3 background image Ib13, and is common to 2-1 foreground image If21, 2-2 foreground image If22 and 2-3 foreground image If23. The set second background image Ib2 is divided into 2-1 background image Ib21, 2-2 background image Ib22 and 2-3 background image Ib23 corresponding to each, and each evaluation image Ie is arranged each time it is displayed. It is set to be different.

  FIG. 20A is a diagram showing a test image It displayed on the display screen 31 in, for example, a first gradation shape specifying operation, and FIG. 20B is a diagram in the second gradation shape specifying operation, for example. It is a figure which shows the test image It displayed on the display screen 31. FIG. 20A and 20B, the display positions of the 1-1 evaluation image Ie11 to 1-3 evaluation image Ie13 and the 2-1 evaluation image Ie21 to 2-3 evaluation image Ie23 in the test image It are shown. Is different.

  Even when such a configuration is adopted as the test image It, the same effects as those of the first embodiment can be obtained. In addition, by performing setting so that the evaluation image Ie is displayed at a different position each time, it is possible to prevent the operator from determining that the image can be identified by assumption (incorrect determination).

<Embodiment 7>
The basic configuration of the present embodiment is almost the same as that of the first embodiment, but the configuration of the test image It is different from that of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 21 is a diagram illustrating an example of a test image It displayed on the display device 30 (display screen 31) based on the test image data in the seventh embodiment.
In the first embodiment, the first test image It1 includes a plurality of evaluation images Ie including the foreground image If and the background image Ib, and the second test image It2 includes the foreground image If and the background image Ib. The plurality of evaluation images Ie included are provided. On the other hand, in the present embodiment, the first test image It1 includes only the background image Ib in addition to the plurality of evaluation images Ie (more specifically, the 1-1 evaluation images Ie11 to 1-3 evaluation images Ie13). The second test image It2 is composed of a plurality of evaluation images Ie (more specifically, 2-1 evaluation images Ie21 to 2-3 evaluation images Ie23). In addition to the above, the second dummy image Id2 including only the background image Ib is provided.

  In the present embodiment, the gradation of the first dummy image Id1 constituting the first test image It1 is set to the first reference gradation value Gs1 common to the 1-1 background image Ib11 in the 1-1 evaluation image Ie11. The Therefore, the gradation of the first dummy image Id1 is common to the gradation of the 1-2 background image Ib12 in the 1-2 evaluation image Ie12 and the 1-3 background image Ib13 in the 1-3 evaluation image Ie13.

  The gradation of the second dummy image Id2 constituting the second test image It2 is set to the second reference gradation value Gs2 that is common to the 2-1 background image Ib21 in the 2-1 evaluation image Ie21. Therefore, the gradation of the second dummy image Id2 is the same as the gradation of the 2-2 background image Ib22 in the 2-2 evaluation image Ie22 and the 2-3 background image Ib23 in the 2-3 evaluation image Ie23.

  Even when such a configuration is adopted as the test image It, the same effects as those of the first embodiment can be obtained. Further, by mixing the first dummy image Id1 in the first test image It1 and the second dummy image Id2 in the second test image It2, it is possible to improve the accuracy of identification by the operator. .

<Eighth embodiment>
The basic configuration of the present embodiment is substantially the same as that of the first embodiment, but the configuration of the evaluation image Ie is different from that of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 22 is a diagram for explaining a configuration example of the shape of the evaluation image in the eighth embodiment.
Here, FIG. 22A is a diagram showing the overall configuration of the evaluation image Ie, and FIG. 22B shows the configuration of various basic images constituting the background image Ib and the foreground image If in the evaluation image Ie. FIG.

  The evaluation image Ie of the present embodiment is a background image Ib that has a circular shape as a whole, and a foreground image that is arranged to overlap the background image Ib so that the center position coincides with the background image Ib, and has a circular shape as a whole. If. The foreground image If is surrounded by the background image Ib.

  In the first embodiment, the background image Ib and the foreground image If are each composed of a halftone image painted at a constant density. On the other hand, in the present embodiment, the background image Ib and the foreground image If are each configured by combining a plurality of basic images.

  In the present embodiment, the background image Ib includes a first circle image C1 having a first diameter, a second circle image C2 having a second diameter larger than the first diameter, and a second diameter. A third circle image C3 having a large third diameter and a fourth circle image C4 having a fourth diameter larger than the third diameter and less than or equal to half of the foreground image If are configured. The background image Ib has a circular shape (actually a ring shape) as a whole by irregularly arranging the first circular image C1, the second circular image C2, the third circular image C3, and the fourth circular image C4. It is supposed to present.

  On the other hand, the foreground image If is also configured to include a first circle image C1, a second circle image C2, a third circle image C3, and a fourth circle image C4, like the background image Ib. The foreground image If has an overall circular shape by irregularly arranging the first circle image C1, the second circle image C2, the third circle image C3, and the fourth circle image C4. .

FIG. 23 is a diagram for explaining an example of the test image It displayed on the display device based on the test image data in the eighth embodiment.
In the first embodiment, the test image It is arranged by arranging the evaluation image Ie (see FIG. 9) including the background image Ib and the foreground image If each composed of a halftone image in 3 rows × 2 columns. Was forming. On the other hand, in the present embodiment, the test image It is formed by arranging evaluation images Ie (see FIG. 22) configured by combining a plurality of basic images in 3 rows × 2 columns. Yes. In the 1-1 evaluation image Ie11 to 1-3 evaluation image Ie13 constituting the first test image It1, and the 2-1 evaluation image Ie21 to 2-3 evaluation image Ie23 constituting the second test image It2, a circular shape is formed. The third test image It3 is arranged in a region (gap) where the basic image to be presented is not arranged.

  Even when such a configuration is adopted as the test image It, the same effects as those of the first embodiment can be obtained. Further, by adopting a combination of a plurality of basic images as the evaluation image Ie constituting the test image It, it becomes possible to improve the accuracy of identification by the operator. Furthermore, by adopting such a test image It, it is possible to display the test image It satisfactorily even in the display device 30 having a relatively low resolution of the display screen 31. Furthermore, by adopting such a test image It, a clear boundary line between the background image Ib and the foreground image If is not generated in each evaluation image Ie. It becomes possible to easily maintain accuracy.

In the present embodiment, the evaluation image Ie (background image Ib and foreground image If) is configured using four types of basic images having different diameters (in this example, the first circle image C1 to the fourth circle image C4). However, the present invention is not limited to this, and at least two basic figures may be used.
In this embodiment, four types of basic images are circular. However, the present invention is not limited to this, and the shape may be changed. However, each basic image needs to have a similar relationship.

<Embodiment 9>
The basic configuration of the present embodiment is almost the same as that of the first embodiment, but the determination method of the reference gradation value Gs (in this example, the first reference gradation value Gs1 and the second reference gradation value Gs2) is implemented. This is different from the first form. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, after determining a target gradation characteristic that is a display target in the display device 30, a comparative gradation characteristic corresponding to the target gradation characteristic is determined based on the determined target gradation characteristic, and determined. Based on the target gradation characteristic and the comparative gradation characteristic, the reference gradation value Gs (in this example, the first reference gradation value Gs1 and the second reference gradation value Gs2) is determined.

FIG. 24 is a diagram for explaining a method of determining the reference gradation value Gs in the ninth embodiment.
Here, FIG. 24A is a graph for explaining a target gradation characteristic and comparison gradation characteristic determination method that is first performed in determining the reference gradation value Gs. FIG. 24B is a graph for explaining a reference gradation value determination method performed subsequent to determination of target gradation characteristics and comparative gradation characteristics. In FIG. 24A, the horizontal axis represents the gradation value (0 to 255), and the vertical axis represents the relative luminance obtained by normalizing the entire luminance with the luminance when the gradation value is 255. In FIG. 24B, the horizontal axis is the gradation value (0 to 255), and the vertical axis is the relative luminance gradient (differentiation result) shown in FIG.

  First, a method for determining target gradation characteristics and comparative gradation characteristics will be described with reference to FIG.

  In this embodiment, when setting the target gradation characteristics, first, the target gradation characteristics are set. Here, a gamma value is used as a method for expressing the target gradation characteristics. In this example, it is assumed that the target gamma value is set to 2.2. The target gamma value can be set to 1.8, for example, in addition to 2.2.

  In this embodiment, after a target gamma value is determined, a gamma value to be compared is determined from a value close to the target gamma value. Here, the gamma value to be compared may be singular or plural. However, when two gamma values to be compared are set, it is preferable to select one from a value smaller than the target gamma value and to select the other from a value larger than the target gamma value. In this example, two gamma values to be compared are set, one gamma value to be the first comparison target is 1.8, and the other gamma value to be the second comparison target is 2. 6 are set respectively.

  Here, FIG. 24A shows a gamma curve corresponding to each gamma value (1.8, 2.2, 2.6). As is clear from FIG. 24A, the shape of the gamma curve differs depending on the gamma value, and the gamma curve shape becomes convex downward as the gamma value increases.

  Next, referring to FIG. 24B, a reference gradation value Gs based on both the target gradation characteristic and the comparative gradation characteristic (in this example, the first reference gradation value Gs1 and the second reference gradation value Gs2). ) Will be described.

  In the present embodiment, differentiation is performed on the target gradation characteristic (gamma value = 2.2) and the two comparative gradation characteristics (gamma value = 1.8 and 2.6) shown in FIG. The slope of each gradation characteristic is obtained. Based on the obtained result, a gradation value (referred to as a boundary gradation value) in which the magnitude relationship of the inclination of the target gradation characteristic with respect to the inclination of the reference gradation characteristic is reversed is obtained. In this example, the boundary gradation value is about 170.

  Then, the first reference gradation value Gs1 is selected from the high gradation area A whose gradation is higher than the obtained boundary gradation value, and the low gradation area B whose gradation is lower than the obtained boundary gradation value is selected. The second reference gradation value Gs2 is selected. As a result, among all the gradations (256 gradations), a plurality of values constituting the reference gradation value Gs can be selected from the high gradation area A and the low gradation area B where the gradation value tends to be shifted. .

  In each embodiment, the creation of the test image data is executed by the computer device 20 provided in the image display system 10. However, the present invention is not limited to this, and is external to the image display system 10. It may be executed by another computer device provided.

  In each embodiment, gradation correction is performed in the display image creation unit 22 provided in the computer device 20. However, the present invention is not limited to this. For example, the gradation is generated inside the display device 30. It does not matter if correction is performed.

DESCRIPTION OF SYMBOLS 10 ... Image display system, 20 ... Computer apparatus, 21 ... Test image data creation part, 22 ... Display image creation part, 23 ... Gradation shape specific | specification part, 24 ... Memory | storage part, 30 ... Display apparatus, 31 ... Display screen, 40 ... input device 211 ... reference gradation value setting unit 212 ... comparative gradation value setting unit 213 ... image shape setting unit 214 ... image arrangement setting unit 215 ... test image generation unit 231 ... discrimination table creation unit 232... Gradation shape discrimination unit

Claims (10)

A reference setting means for setting a first reference gradation value serving as a first reference and a second reference gradation value serving as a second reference and having a gradation different from the first reference gradation value;
The first reference tone value that is set based on the first reference tone value and is the comparison target of the first reference tone value, and the second reference tone value that is set based on the second reference tone value Comparison setting means for setting a second comparison gradation value to be compared with the gradation value;
A first image in which one of the first reference image set to the first reference gradation value and the first comparison image set to the first comparison gradation value are arranged so as to surround the other; and the second Creating means for creating a second reference image set to a reference gradation value and a second image arranged such that one of the second reference image set to the second comparison gradation value surrounds the other ; Including image processing apparatus. The comparison setting means sets a plurality of values as the first comparison gradation value, and sets a plurality of values as the second comparison gradation value,
The creating means includes, as the first image, the first reference image and a plurality of the first comparison images having different gradations by setting each of the first comparison gradation values. The first image is created side by side, and the second image is set to the second reference image and each of the second comparative gradation values, and a plurality of the second images having different gradations are set. The image processing apparatus according to claim 1, wherein the second comparison image is generated by arranging the two comparison images. The creating means makes the shapes of the plurality of first comparison images or the plurality of first reference images in the first image different from each other, and the plurality of the second comparison images or the plurality of the second images in the second image. Different shapes of the first reference images
The image processing apparatus according to claim 2. The creation means irregularly arranges each of the plurality of first comparison images or the plurality of first reference images in the first image, and the plurality of the second comparison images or the plurality of the second images. Arranging each of the second reference images irregularly
The image processing apparatus according to claim 2. In the case where a plurality of values are set as the first comparison gradation value, the comparison setting means sets all of the plurality of values constituting the first comparison gradation value to be larger than the first reference gradation value or When setting a small value and setting a plurality of values as the second comparison gradation value, all of the plurality of values constituting the second comparison gradation value are set larger or smaller than the second reference gradation value. The image processing apparatus according to claim 2, wherein: The image processing apparatus according to claim 1, wherein the creation unit arranges the first image and the second image side by side. The reference setting means sets the first reference gradation value to a gradation value that exceeds half of all gradations, and sets the second reference gradation value to a gradation value that is less than half of all gradations. The image processing apparatus according to claim 1, wherein: Setting a first reference gradation value that is a first reference and a second reference gradation value that is a second reference and has a gradation different from the first reference gradation value;
The first reference tone value that is set based on the first reference tone value and is the comparison target of the first reference tone value, and the second reference tone value that is set based on the second reference tone value Setting a second comparison gradation value to be compared with the gradation value;
A first image in which one of the first reference image set to the first reference gradation value and the first comparison image set to the first comparison gradation value are arranged so as to surround the other; and the second Creating a second reference image set to a reference tone value and a second image arranged such that one of the second comparison images set to the second comparison tone value surrounds the other. Image processing method. After the step of creating the first image and the second image, displaying the first image and the second image on a display device;
In the first image displayed on the display device, whether or not the first reference image and the first comparison image can be identified visually is received and the second image displayed on the display device. Receiving in the image whether or not the second reference image and the second comparison image can be identified visually;
The image processing method according to claim 8 , further comprising: specifying a gradation shape in the display device based on an identification result in the first image and an identification result in the second image. On the computer,
A function of setting a first reference gradation value serving as a first reference and a second reference gradation value serving as a second reference and having a gradation different from the first reference gradation value;
The first reference tone value that is set based on the first reference tone value and is the comparison target of the first reference tone value, and the second reference tone value that is set based on the second reference tone value A function of setting a second comparison gradation value to be compared with the gradation value;
A first image in which one of the first reference image set to the first reference gradation value and the first comparison image set to the first comparison gradation value are arranged so as to surround the other; and the second The second reference image set to the reference gradation value and the second comparison image set to the second comparison gradation value to create a second image arranged so that one surrounds the other are realized Program to make.