JPWO2011102157A1 - Image display method, image display apparatus, image display program, and display medium - Google Patents

Abstract

General color-sensitive persons can observe the original image information, and weak-colored persons can observe the image while identifying the color difference. In the first image adjusted so that the display approximates the original image information and the second observation condition set in advance as a condition different from the first observation condition, the specific image included in the original image information Corresponding to the color information, displaying the image information with the second image adjusted to be displayed according to the predetermined color information or the emphasis information and added to the first image. Features.

Description

  The present invention relates to an image display method, an image display device, an image display program, and a display medium that enable chromatic image display (color presentation) in a state suitable for observation by a color weak person or the like.

  The present invention also relates to an image display method, an image display device, an image display program, and a display medium that make it possible to guess the original chromatic color image display when the chromatic color image display is an achromatic color image display.

  The color weakness means that it has a weaker part in color recognition / identification than a general color vision person due to a difference in pyramidal cells that recognize color. Here, as described in “Basics of Color Engineering”, Mitsuo Ikeda, Asakura Shoten, Table 9.1 Classification and Simplified Symbols (p189) for Color Weaker, Red (L cone), They are classified according to the classification of green (M cone) and blue (S cone) photoreceptors and the degree of their sensitivity. Those who do not have the sensitivity of any photoreceptor cells are called A type color weak, P type color weak in the case of the L cone, D type color weak in the case of the M cone, and T type in the case of the S cone. Classified as color deficient. When any one of the sensitivities is low, they are classified as PA, DA, and TA, respectively. The color vision characteristics of P, D, and T type color weak people are also described in “Basics of Color Engineering”, Mitsuo Ikeda, Asakura Shoten, Fig. 9.13 Confusion Color Lines for Two Color Type Color Weak People (p205) The colors existing on the line (the mixed color line) look exactly the same color and cannot be distinguished.

  These color deficient persons cannot normally identify the color of an image viewed by a general color vision person in the same way, and image display or image conversion for color deficient persons is necessary.

  When the chromatic color image display is an achromatic color image display, for example, when color image information is printed in monochrome, the same problem as the above case may occur even for a general color vision person. That is, when color image information on a computer is printed out by a monochrome printer, it is in a state of being reproduced only as monochrome shades even if the original colors are different. The same problem occurs when a color original is copied by a monochrome copying machine.

  The following patent document has been proposed for this type of problem.

WO2009 / 020115A1

  The technique described in Patent Document 1 gives hatching to chromatic colors so that the color weak can be informed of the existence of colors. Further, by changing the hatching angle for each color, different colors existing on the same mixed color line can be distinguished. In addition, by setting the hatching angle to a predetermined absolute angle, it becomes possible for the color weak to discriminate the color.

  In this case, the state of the original image is changed by hatching for the general color sensation person, which may be annoying.

  The present invention has been made in order to solve the above-described problems, and can be observed in a state in which the original image information is substantially retained by a general color vision person, and the color weak person is restored to the original image information. An image display method, an image display device, an image display program, and a display medium that are observable while identifying corresponding color differences and that can display images in a state suitable for observation by both general color blind and color weak The purpose is to provide.

  The present invention also provides an image display method, an image display device, an image display program, and a display medium that can realize an image display in which color information before monochromeization is transmitted when color image information is displayed in black and white. The purpose is to provide.

  The present invention for solving the above problems is as described below.

  (1) The image display method, the image display apparatus, the image display program, and the display medium according to the present invention display the same or similar to the original image information as the original image information under a predetermined first observation condition. The predetermined color information or the emphasis information is associated with specific color information included in the original image information in the second observation condition that is predetermined as a condition different from the one image and the first observation condition. The image information is displayed by the second image added to the first image and displayed.

  Further, the first observation condition is different from the first image generation unit that generates a first image that is displayed in the same manner as the original image information or approximate to the original image information under a predetermined first observation condition. In the second observation condition predetermined as a condition, display is performed in which predetermined color information or emphasis information is added to the first image in association with the specific color information included in the original image information. And a display medium configured to selectively display the first image and the second image according to the first observation condition and the second observation condition. And an output unit for outputting.

  (2) The enhancement information includes a pattern having different angles or hatching having different angles according to the color of the original image information.

  (3) The difference between the first observation condition and the second observation condition is the difference in the direction in which the image is observed, the difference in the direction of light irradiated on the image, and the wavelength of the light irradiated on the image. It is at least one of a difference in distribution and a difference in ambient illumination around the image.

  (4) The second image is a watermark image inserted into the first image using metamerism.

  (5) The second image is characterized in that an additional color material having a component or amount different from that of the color material (normal color material) used in the first image is used.

  (6) The additional color material is a material having a property of selectively reflecting a specific component of incident light, a material having a property of displaying differently between transmitted light and reflected light, and increasing or decreasing the glossiness of an image. It is at least one of a material, a retroreflective material that retroreflects incident light, a fluorescent paint that emits light of a different wavelength by receiving light of a specific wavelength, and a material whose color or pattern changes depending on the observation angle. And

  (7) Based on the total colorimetric values (first observation condition total colorimetric values) of the normal color material and the additional color material in the first observation condition, a display that approximates the original image information is made. Each color material is selected in such a manner.

  (8) The degree of enhancement corresponding to the degree of color difference reduction is calculated, and the additional color material is used so that the second image realizes the degree of enhancement under the second observation condition.

  (9) The contour or boundary of different colors existing on the confusion color line in the original image information has the contour or boundary such that a difference occurs in any one of brightness, luminance, chromaticity, and saturation in the second observation condition. The additional color material is used at the boundary.

  (10) The color difference reduction degree is characterized in that the color difference between the target pixel and the surrounding pixels in the original image information is reduced according to the color vision characteristics of the observer.

  According to the image display method, image display apparatus, image display program, and display medium of the present invention, the following effects can be obtained.

  (1) In the image display method, the image display apparatus, the image display program, and the display medium of the present invention, the display is the same as the original image information or approximate to the original image information under a predetermined first observation condition. For the first image adjusted to the predetermined color information corresponding to the specific color information included in the original image information under the second observation condition that is predetermined as a condition different from the first observation condition. Or, by adding a second image that is adjusted to display according to the emphasis information, the general color sense person under the first observation condition can observe the original image information. The color weak person under the second observation condition can be observed while identifying the difference in color, and can be displayed in a state suitable for observation by both the general color blind person and the color weak person.

  (2) The emphasis information includes patterns with different angles according to the color of the original image information or hatching with different angles, so that the visually impaired under the second observation condition can easily identify the color difference and observe It becomes easy to do.

  (3) At least one of a difference in the direction in which the image is observed, a difference in the direction of light irradiated on the image, a difference in wavelength distribution of light irradiated on the image, and a difference in ambient illuminance around the image By making the difference between the first observation condition and the second observation condition, it is possible to easily set a desired observation condition and observe a display suitable for the set observation condition.

  (4) By using a watermark image inserted into the first image using metamerism as the second image, the general color sense person under the first observation condition observes the original image information. It is possible, and the weak color person under the second observation condition can observe the color difference while discriminating the color difference, and can display in a state suitable for observation by both the general color blind person and the weak color person.

  (5) The second image uses an additional color material having a different component or amount from the color material (ordinary color material) used for the first image, thereby impairing the display state of the original image information. In addition, the image can be displayed in a state suitable for observation by both general color blind and color weak.

  (6) The additional color material is a material having a property of selectively reflecting a specific component of incident light, a material having a property of displaying differently between transmitted light and reflected light, and increasing or decreasing the glossiness of an image. By using at least one of a material, a retroreflective material that retroreflects incident light, a fluorescent paint that emits light of another wavelength by receiving light of a specific wavelength, and a material whose color or pattern changes depending on the observation angle, The original image information can be displayed in a state suitable for observation by both the general color vision person and the color weak person without impairing the display state of the original image information.

  (7) Based on the total colorimetric values (first observation condition total colorimetric values) of the first image and the second image under the first observation condition, a display approximate to the original image information is made. By selecting each color material, the display state of the original image information (original color and pattern) for the general color senser can be accurately maintained, and the color information can be identified even for the weak colorant. Appropriate display becomes possible.

  (8) By calculating the degree of enhancement according to the degree of color difference reduction and using an additional color material so that the second image realizes the degree of enhancement under the second observation condition, the original image information (original (Colors and patterns) can be accurately displayed, and display suitable for observation in a state where color information can be identified even for the weak.

  (9) Contours or borders of different colors existing on the confusion color line in the original image information so that a difference occurs in any one of lightness, luminance, chromaticity, and saturation in the second observation condition. By using the additional color material, the color difference (contour or boundary) on the confused color line can be displayed in a state where it can be clearly identified for the color weak.

  (10) The degree of color difference reduction is the degree to which the color difference between the target pixel and the surrounding pixels in the original image information is reduced according to the color vision characteristics of the observer, and thus is used for the color-weak person in the second observation condition. On the other hand, it is possible to perform display suitable for observation in a state where color information can be identified.

  (11) Further, when the color image information is output in monochrome, the original chromatic state can be identified in the case of a monochrome image or all color blindness by adding the second image to the first image. It becomes possible.

It is a flowchart which shows operation | movement of embodiment of this invention. It is a block diagram which shows the structure of embodiment of this invention. It is explanatory drawing which shows the mode of the coloring material used in embodiment of this invention, and observation conditions. It is explanatory drawing which shows the mode of the coloring material used in embodiment of this invention, and observation conditions. It is explanatory drawing which shows the mode of the colorimetry of the coloring material of embodiment of this invention. It is explanatory drawing of the display state of embodiment of this invention.

  The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described below in detail with reference to the drawings.

(A) Configuration of image display device:
FIG. 2 is a block diagram showing a detailed configuration in the image display apparatus 100 that executes the image display method according to the first embodiment of the present invention.

  Note that the block diagram of the image display apparatus 100 also represents the processing procedure of the image display method and each routine of the image display program.

  Further, in FIG. 2, the periphery of the portion necessary for the description of the operation of the present embodiment is mainly described, and various portions such as a power switch and a power circuit known as the other image display device 100 are omitted. It is.

  The image display apparatus 100 according to the present embodiment can be observed by a general color blind person in a state where the original image information is held. The color weak person can observe the color difference while identifying the color difference. A control unit 101 that executes control to enable image display in a state suitable for observation by both, a storage unit 103 that stores information about a second image corresponding to color vision characteristics and observation conditions, and color vision characteristic information. The operation display unit 105 in which designation regarding the observation condition is input by the operator, and the first display condition determined in advance are adjusted so that the display is the same as or similar to the original image information. The first image generation unit 110 that generates one image is determined in advance in association with specific color information included in the original image information in a second observation condition that is predetermined as a condition different from the first observation condition. A second image generation unit 120 that generates a second image that is adjusted so as to be displayed according to color information or emphasis information and is added to the first image, composition of the first image and the second image, or an image An image processing unit 130 that executes various image processing at the time of display, and a printer unit 140 as an output unit that outputs a display medium configured to be displayed with the second image added to the first image are provided. It is configured.

  The image display device 100 is not only configured as a single unit, but also includes a control unit 101, a storage unit 103, an operation display unit 105, a first image generation unit 110, a second image generation unit 120, an image processing unit 130, and a printer. Each or any of the units 140 may exist at a distant place and connected by various communication lines.

  Note that the printer unit 140 uses a normal color material such as Y, M, C, or K to display the first image adjusted so that the display approximates the original image information under a predetermined first observation condition. The display according to the predetermined color information or the emphasis information in association with the specific color information included in the original image information in the second observation condition that is formed as a condition different from the first observation condition The second image adjusted so as to be added to the first image is formed with the additional color material. The emphasis information includes patterns with different angles according to the color of the original image information or hatching with different angles, so that it is easy for color-deficient people under the second observation condition to easily observe the color difference while easily identifying the difference in color. .

  In addition, an additional color material having a component or amount different from that of the color material (ordinary color material) used for the first image is used for the second image without impairing the display state of the original image information. Thus, it is possible to display in a state suitable for observation by both general color blind and color weak.

  Specifically, as the additional color material, a specific component (wavelength component, polarization component, etc.) of the incident light is selected so that it is nearly transparent so as not to impair the color of the normal color material as much as possible. A material that reflects light automatically, a material such as a matting agent that scatters light to reduce the glossiness of the image (see FIG. 3A), and a transparent material that efficiently reflects light and increases the glossiness of the image Materials such as toner (see FIG. 3B), retroreflecting material that retroreflects incident light (see FIG. 3C), fluorescent paint that emits light of a different wavelength by receiving light of a specific wavelength, observation angle A material such as pearl, metallic, or hologram whose color and pattern change due to, and a material that has different properties in display state between transmitted light and reflected light by blocking transmitted light from the back surface (comparison with Fig. 4 (a)) In FIG. 4B, refer to the color material 220d). The use of at least one. Thereby, it becomes possible to display in a state suitable for observation by both the general color vision person and the color weak person without impairing the display state of the image information of the original first image.

  Here, the difference between the first observation condition and the second observation condition is that there is a difference in the direction in which the image is observed, a difference in the direction of light applied to the image (difference in the angle of reflected light, transmitted light and reflected light). Difference in combination with light), difference in wavelength distribution of light applied to the image, and difference in ambient illuminance around the image. For example, a normal observation condition is defined as the first observation condition, and an observation condition that is different from the first observation condition is defined as the second observation condition.

  For example, when the color materials 220a to 220c in FIG. 3 are used as additional color materials, observation in a state where the effect of the additional color material does not occur is defined as the first observation condition, and the effect of the additional color material is produced. It is desirable to set the observation in the state of irradiating light as the second observation condition, but it may be set in reverse. The additional color material may be formed so as to cover the surface of the normal color material, or may be formed so as to adjust the surface state of the recording medium 200 as a base of the additional color material.

  Further, when the color materials 220a1 to 220a2 in FIG. 4 are used as the normal color material and the color material 220d as the additional color material, the observation in a state where the transmitted light blocking effect by the additional color material 220d does not occur is the first observation condition. It is desirable to set the observation in the state of irradiating light that causes the transmitted light blocking effect by the additional color material as the second observation condition.

  Further, the color materials 220a to 220c of FIG. 3 are used as additional color materials so as to cover the surfaces of the normal color materials 220a1 and 220a2, and further, the transmitted light is blocked as a base of the normal color materials 220a1 and 220a2. The additional color material 220d may be used in combination.

  In addition, the presence or absence of fluorescence by using fluorescent paint as an additional color material using light of different components (front light and ultraviolet light) for front incident light and rear incident light, and generating fluorescence with rear incident light. It is also possible to use the difference.

(B) Procedure of image display method, operation of image display device, processing of image display program:
Hereinafter, the operation of this embodiment will be described with reference to the flowchart of FIG. 1 and the explanatory diagrams of FIG.

(B-0) Colorimetry for the first image under the first viewing condition:
First, before executing the specific processing for image display shown in FIG. 1, color measurement is performed in advance using a normal color material and an additional color material. Here, a case where three colors of YMC are used as normal color materials is taken as a specific example.

  Image information of a chart of 125 colors (LUT color measurement model) in five stages for each YMC as shown in FIG. 5 is prepared. Then, the usage rate of the additional color material is changed, for example, 125 color chart + additional color material 0% addition (FIG. 5A), 125 color chart + additional color material 50% addition (FIG. 5B). )), A chart of 125 colors + additional color material 100% addition (FIG. 5C) is output from the printer unit 140.

  By combining a color chart using a spectroradiometer, etc., under the first observation condition with a chart that changes the usage rate of the additional color material, the normal color material and the additional color material under the first observation condition are combined. A first observation condition total colorimetric value corresponding to the appearance in the obtained state is acquired. In many cases, the saturation tends to decrease as the usage rate of the additional color material increases.

  Although it is desirable to prepare a chart of the usage rate of the additional color material that is actually planned to be used for color measurement, it is also possible to obtain a colorimetric value by calculation as necessary by interpolation calculation or the like. . If the usage rate of the additional color material is 25%, it can be obtained by an average value of the usage rates of the additional color material of 0% and 50% or by spline function interpolation.

  Then, a desired colorimetric value in the original image is searched by using a color management method separately proposed by the inventor of the present application. The specific technique is described in `` Po-Chieh Hung, Colorimetric calibration in electronic imaging devices using a look-up-table model and interpolations, Journal of Electronic Imaging, 2 (1), 53-61 (1993). '' ing.

  The additional color material is not limited to one type, but may be used as a gloss color material M% and a fluorescent color material N%. Therefore, the LUT color measurement model shown in FIG. 5 is created in a state where a plurality of types of additional color materials are combined, such as the first additional color material M% and the second additional color material N%, and the color measurement is performed. It is desirable.

  By performing color measurement for the first observation condition total colorimetric value as described above, even when an additional color material for the second image described later is used, Thus, it is possible to ensure a visual appearance that is not different from that of a general color sense person. That is, the color measurement of FIG. 5 does not adversely affect the normal appearance.

(B-1) Determination of color vision characteristics and observation conditions:
Then, when executing the image display method of the present embodiment, the color vision characteristic information such as the type of the weak color and the observation conditions (first observation condition, second observation condition) are displayed on the control unit 101 as an operation display. The operator inputs from the unit 105 or inputs from an external PC or the like (step S101 in FIG. 1). This color vision characteristic information is information such as which type belongs to a color weak person or which color is difficult to distinguish. In other words, the color vision characteristic information is information about a region that is a different color in a chromatic image but has a similar light reception result (similar and difficult to distinguish) on the light receiving side. Note that the control unit 101 determines how to generate the second image based on the color vision characteristic information input here.

(B-2) Image information input:
Next, chromatic image information is input to the first image generation unit 110 and the second image generation unit 120 in the image display device 100 (step S102 in FIG. 1). Note that an image memory (not shown) may be provided in the image display device 100, and the image information may be temporarily stored and then input to the first image generation unit 110 and the second image generation unit 120.

(B-3) Pixel position selection:
With respect to the image information input as described above, the control unit 101 selects a pixel position according to a predetermined processing order in order to proceed with processing for each pixel (one pixel) (step S103 in FIG. 1).

(B-4) Calculation of color difference from surroundings in original color:
For the image information of the selected pixel position (target pixel), the control unit 101 determines the color difference (dE1) between the average value of the image information of the surrounding 4 pixels or the surrounding 8 pixels and the image information of the pixel in the original color. ) Is calculated (step S104 in FIG. 1).

If it is calculated in the sRGB system, it is converted into tristimulus values XYZ in accordance with the sRGB standard, and then the color difference is calculated in the L ^* a ^* b ^* uniform color space or the like. For color difference calculation, various known methods can be used.

(B-5) Calculation of color difference from surrounding color in weak color state:
Further, the control unit 101 converts the image information into a visual appearance that approximates the specified color vision characteristic (color weakness type), and then, for the image information at the selected pixel position, the surrounding 4 pixels or the surrounding 8 pixels. The color difference (dE2) is calculated from the average value of the image information and the image information of the pixel (step S105 in FIG. 1).

  Here, color appearance simulation may be executed by various methods to approximate the appearance. Various known methods such as a Sobel filter can be used for the color difference calculation in the approximated state.

(B-6) Color difference reduction degree (decrease rate) calculation in a color weak state:
Further, the control unit 101 calculates a color difference reduction degree R = dE2-dE1 from the color difference (dE2) in the color weak approximation state and the color difference (dE1) in the original color (step S106 in FIG. 1). Here, since dE2 <dE1, R is a negative value, but may be 0 if the color difference does not decrease and is a positive value. Further, the control unit 101 may calculate the color difference reduction rate R ′ = dE2 / dE1.

(B-7) Calculation of enhancement degree (enhancement rate) according to the color difference reduction degree:
The control unit 101 calculates the enhancement degree Ae or the enhancement rate Ae ′ that cancels the decrease in accordance with the color difference decrease degree R or the color difference decrease rate R ′ (step S107 in FIG. 1). Note that this enhancement may be performed either on the entire area to be lowered or on the edge of the area to be lowered so that the area to be lowered can be identified. Here, the enhancement degree Ae is set to Ae = −R, and the enhancement rate Ae ′ is set to Ae ′ = 1 / R ′. Here, if the edge is emphasized, an edge enhancement technique such as unsharp masking can be used. That is, the color measurement in FIG. 5 is in a state that does not adversely affect the normal appearance, and under the second observation condition, the enhancement according to the color difference reduction degree of the color weakness is performed, and thus a good result is obtained. It is done.

(B-8) Determination of additional color material according to the degree of enhancement (emphasis rate):
The control unit 101 calculates an enhancement degree Ae or an enhancement rate Ae ′ that cancels out the above-described color difference reduction degree R or color difference reduction rate R ′. The enhancement degree Ae or the enhancement degree Ae ′ and the second observation Depending on the conditions, the type and amount of the additional color material and the usage expression method (hatching, solid painting, edge (contour) emphasis, combination of these, etc.) are determined (step S108 in FIG. 1).

  In this case, when hatching is used, chromaticity, saturation, which should be expressed by combining the hatching angle, hatching line thickness, hatching fineness (line spacing), etc. It is possible to express brightness and the like, and the control unit 101 refers to data stored in advance in the storage unit 103, and determines the types and amounts of additional color materials appropriate for various color vision characteristics and observation conditions. Decide how to use.

(B-9) Adjustment of normal color material to offset the influence of additional color material:
The control unit 101 determines the amount of the additional color material corresponding to the enhancement degree Ae or the enhancement rate Ae ′ so as to cancel out the color difference reduction degree R or the color difference reduction rate R ′. Accordingly, the normal color material is adjusted according to the situation in which the appearance of the first image changes under the first observation condition (step S109 in FIG. 1).

  That is, as described above in “(B-0) Colorimetry for the first image under the first viewing condition”, the appearance of the first image under the first viewing condition depends on the amount of the additional color material. Since it changes, the color material is usually adjusted so as to cancel the change.

(B-10) Confirmation of completion of all pixels:
Each process (steps S103 to S109 in FIG. 1) is performed for the image information at the pixel position selected as described above (step S110 in FIG. 1) for all the pixels of the image information.

  When the processing for all the pixels is completed (YES in step S110 in FIG. 1), the first image with the normal color material according to the original image information or the adjusted normal color material, the addition determined according to the degree of enhancement In response to an instruction from the control unit 101, the printer unit 140 displays and outputs an image of the second image using the color material (step S111 in FIG. 1). In the example of this embodiment, the first image is output on the recording medium using the normal color material of YMC, and in parallel with this, the second image is output on the recording medium using the additional color material.

(C) Specific example:
Hereinafter, the present embodiment will be described with reference to specific examples.

  Here, a specific example is given of a case where the designated color vision characteristic is a red and green dichroic color weakness. It should be noted that here, the appearance of the general color blind person and the color weak person is schematically shown in the monochrome drawing of the patent application.

  Assume that an image of a red mark (FIG. 6 (a1)) that can be identified by a general color sense person is input to the image display apparatus 100 as image information. The image of the red mark on the green background in FIG. 6 (a1) is as shown in FIG. 6 (a2) in the case of a color vision characteristic of weak color that cannot be distinguished from red and green, and the contents cannot be identified.

  Here, when the first observation condition specified for the image display apparatus 100 is normal illumination light, and the second observation condition uses ultraviolet light, the control unit 101, for example, the entire red or green region or an edge (contour). Or the state of the second image is determined so that hatching at different angles is formed with an additional color material such as fluorescent paint on the whole or one edge (contour) of either the red or green region. To do. Here, hatching (FIG. 6B) with an additional color material such as a fluorescent paint at different angles in each of the green and red regions is taken as the second image. Further, as described above, the control unit 101 adjusts the normal color material of the first image so as to cancel the color change of the first image caused by the additional color material.

  Then, an image in a state where the first image of the normal color material generated as described above and the second image of the additional color material are superimposed is formed on the recording medium 200 from the printer unit 140 under the control of the control unit 101. And output.

  When the general color vision person observes the first image and the second image formed on the recording medium 200 under the first observation condition, as shown in FIG. A red mark is observed in the green area that looks close to. In this case, since hatching or the like is not observed, no annoyance is felt, and the original mark is not mistaken as another mark.

  On the other hand, when the color weak person observes the first image and the second image formed on the recording medium 200 under the second observation condition, hatching is shown as shown in FIG. 6 (c2). It becomes clear that there is a color difference. That is, it does not fall into the indistinguishable state as shown in FIG. In addition, by determining the correspondence between the hatching angle and the color in advance, it becomes possible to know the original color such as a red mark on the green background.

  In this case, it is possible to express chromaticity, saturation, brightness, etc. by combining hatching angle, hatching line thickness, hatching fineness (line spacing), etc. The second image generation unit 120 is controlled so as to generate a second image with an appropriate additional color material according to various color vision characteristics and observation conditions with reference to data stored in advance in the storage unit 103.

(D) Other specific examples:
Here, the entire color that cannot be identified is hatched, but the same identification can be performed by hatching the edge (contour).

  Instead of hatching, it is also possible to apply a fluorescent paint as an additional color material to one of the areas, or to apply a fluorescent paint to the edge in order to emphasize the edge (contour) of the area. is there.

  Further, when a normal color material having a fluorescent paint in advance is used, an ultraviolet absorber can be used as an additional color material. Also in this case, it is possible to identify the color in the same manner as described above by causing a difference in the presence or absence of fluorescence in the second observation condition.

  In addition, contours or borders of different colors existing on the confusion color line in the original image information are added at the contours or borders so that differences in brightness, luminance, chromaticity, or saturation occur in the second viewing condition. By using the color material, it becomes possible to display the color difference (contour or boundary) on the confused color line in a state that can be clearly identified for the color weak.

  In addition, when an observation angle is set as an observation condition and a hologram is adopted as an additional color material, by setting the first observation condition to be other than directly in front, the first image can be observed as a normal image other than directly in front. The second image by the hologram is observed while being superimposed on the first image.

  In the above specific examples, the color vision characteristics such as color weakness in which the color image information cannot be identified are specific examples. However, the present invention is not limited to this, and when the color image information is displayed in black and white, the black and white characteristics are displayed. It is also possible to display an image that conveys color information before conversion. In this case, when observed under the first observation condition, it can be observed in a state close to the original image information by a normal monochrome image (grayscale image), and when observed under the second observation condition The presence of the original color can be confirmed by hatching such as fluorescence.

  In the above description, the first image using the normal color material and the second image using the additional color material have been described. However, a plurality of types of second images (second images) using different additional color materials and different observation conditions. It is also possible to use an image, a third image,. As a result, it is possible to display a plurality of types of second images (second image, third image,...) For different types of color deficient persons, and display each of color information and emphasis information.

  In addition, even if the display is for a single color vision characteristic, multiple additional color materials and multiple viewing conditions are set, and under certain viewing conditions, the fact that there is an outline due to the difference in color is displayed in fluorescence. In addition, it is possible to pursue visibility by displaying, for example, how many colors are displayed under different observation conditions by hatching.

  In addition, as the display medium shown in the above embodiments and specific examples, it can be applied to various types of prints, posters, signboards, etc. In addition to this, various notification switches such as emergency guidance displays and emergency stop switches are available. It is possible to apply to such things.

  That is, due to the difference in ambient illuminance around the image, the normal illumination light is set as the first observation condition, the emergency illumination light that is turned off in the event of an emergency due to a power failure, etc. By adopting an additional color material that reacts to the component and angle of the light, various guidance displays, notification switches, etc. that are difficult to see under emergency lights where the illuminance decreases or the wavelength component of light is different from normal Can also be displayed. In this case as well, it is possible to use a first image with a normal color material, a second image for the color weak, and a second image (third image) at low illuminance in an emergency.

  In addition, as a second observation condition when displaying the second image described above, a color weak person or the like brings a specific illumination light source, and operates an illumination light switch for a second observation condition prepared in advance. The illumination light for the second observation condition may automatically operate when a specific observer carrying a tag or the like approaches.

  In addition, the control unit 101 uses the watermark image inserted into the first image using metamerism as the second image, so that the original image information is retained for the general color vision person under the first observation condition. It is possible to observe under the second observation condition, and the color weak person under the second observation condition can observe while discriminating the difference in color so that it can be displayed in a state suitable for observation by both general color blind and color weak person. Become.

DESCRIPTION OF SYMBOLS 100 Image display apparatus 101 Control part 103 Memory | storage part 105 Operation display part 110 1st image generation part 120 2nd image generation part 130 Image processing part 140 Printer part

Claims (13)

A first image that is displayed in a similar manner to the original image information or approximate to the original image information under a predetermined first observation condition;
In the second observation condition predetermined as a condition different from the first observation condition, predetermined color information or enhancement information is associated with the specific color information included in the original image information in the first image. A second image that is added to the display,
An image display method comprising displaying image information by: The enhancement information includes a pattern with different angles or hatching with different angles according to the color of the original image information.
The image display method according to claim 1. The difference between the first observation condition and the second observation condition is:
It is at least one of a difference in the direction of observing the image, a difference in the direction of light irradiated on the image, a difference in wavelength distribution of light irradiated on the image, and a difference in ambient illuminance around the image.
The image display method according to claim 1. The second image is a watermark image inserted into the first image using metamerism;
The image display method according to any one of claims 1 to 3. For the second image, an additional color material having a different component or amount from the color material (normal color material) used for the first image is used.
The image display method according to claim 1, wherein: The additional color material is
Materials that selectively reflect specific components of incident light, materials that have different display states between transmitted light and reflected light, materials that increase or decrease the glossiness of images, and recursion that retroreflects incident light Materials, fluorescent paint that emits light of a different wavelength by receiving light of a specific wavelength, materials whose color or pattern changes depending on the observation angle,
Is at least one of
The image display method according to claim 5. Based on a comprehensive colorimetric value (first observation condition total colorimetric value) of the normal color material and the additional color material in the first observation condition, a display approximate to the original image information is made. Select each color material,
The image display method according to claim 5, wherein the image display method is an image display method. Calculating the degree of enhancement according to the degree of color difference reduction, and using the additional color material so that the second image realizes the degree of enhancement in the second observation condition;
The image display method according to claim 7. In the contour or boundary of different colors existing on the confusion color line in the original image information, in the contour or the boundary, a difference occurs in any one of brightness, luminance, chromaticity, and saturation in the second observation condition. Using the additional colorant,
The image display method according to claim 5, wherein the image display method is an image display method.   9. The image display method according to claim 8, wherein the color difference reduction degree is a degree in which a color difference between a target pixel and its surrounding pixels in original image information is reduced according to a color vision characteristic of an observer. . A first image generation unit that generates a first image that is displayed in the same manner as the original image information or approximate to the original image information under a predetermined first observation condition;
In the second observation condition predetermined as a condition different from the first observation condition, predetermined color information or enhancement information is associated with the specific color information included in the original image information in the first image. A second image generation unit for generating a second image to be displayed added to the display;
An output unit configured to output a display medium configured to selectively display the first image and the second image according to the first observation condition and the second observation condition;
An image display device comprising: A first image generation unit that generates a first image that is displayed in the same manner as the original image information or approximate to the original image information under a predetermined first observation condition;
In the second observation condition predetermined as a condition different from the first observation condition, predetermined color information or enhancement information is associated with the specific color information included in the original image information in the first image. A second image generation unit for generating a second image to be displayed added to the display;
An output unit configured to output a display medium configured to selectively display the first image and the second image according to the first observation condition and the second observation condition;
An image display program for causing a computer to function as A first image that is displayed in a similar manner to the original image information or approximate to the original image information under a predetermined first observation condition;
In the second observation condition predetermined as a condition different from the first observation condition, predetermined color information or enhancement information is associated with the specific color information included in the original image information in the first image. A second image that is added to the display,
A display medium comprising: the first image and the second image are selectively displayed.