JP2016012136A - Image processing device, display device, image processing method, and program for image processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processing device capable of reducing harmful blue light and protecting eyes of a user, in a manner conforming to the characteristics of an image to be displayed itself, preferences of the user for displaying the image, and the like.SOLUTION: An image processing device includes: a blue light reduction control unit 3 for obtaining image information Sin corresponding to an image to be displayed on a display 8; and a pixel value updating unit 6 for reducing each brightness of color components and generating updated image information Sbc such that reduction rate of brightness corresponding to a blue color component in the obtained image information Sin is equal to or more than reduction rate of brightness corresponding to other color components in the image information Sin, and outputting and displaying the updated image information Sbc to the display 8.

Description

  The present invention belongs to the technical field of an image processing device, a display device, an image processing method, and an image processing program. More specifically, the present invention belongs to a technical field of an image processing device, a display device, an image processing method, and a program for the image processing device for protecting the eyes of a user who views a displayed image.

  In recent years, LEDs (Light Emitting Diodes) have been actively adopted as backlights for personal computers and tablet terminal devices. This LED emits strong light in the blue region of visible light, and since it has high energy, it is said to cause damage to the retina and the like of the user's eyes. In order to improve this problem, optical parts effective for reducing fatigue and preventing eye diseases have been proposed. Patent Document 1 listed below is an example of a patent document that discloses such an optical component that has such an antiglare effect, is effective in reducing fatigue and preventing eye diseases, and has good visibility.

  In the optical component disclosed in Patent Document 1, light of a specific wavelength (hereinafter simply referred to as “blue light”, the wavelength is about 400 to 500 nanometers) is reduced to prevent the optical component. Realizes dazzling effect, reduced fatigue, and prevention of eye diseases. In addition, the optical component is configured to reduce blue light irradiated to the eye by attaching it to a display device (or attaching the optical component in a lens shape to spectacles and viewing through the lens). ing.

JP 2013-8052 A

  However, when only the blue light is reduced using the optical component disclosed in Patent Document 1, the color of the displayed image appears to change, so the clearness of the entire image is lost. There is a problem that. For this reason, depending on the content of the image itself and the situation in which it is viewed, it is possible to achieve both a clearness (if you do not want to reduce blue light) and a case where you want to reliably reduce blue light. desired.

  On the other hand, when the optical component disclosed in Patent Document 1 is used, it is difficult to frequently replace it depending on the situation. Therefore, the above blue light reduction cannot be appropriately controlled on / off. In addition, when the blue light is reduced by the optical component, it is uniformly reduced regardless of the image itself, and therefore it is impossible to perform on / off control of the blue light reduction in conjunction with the content of the image. Furthermore, since the reduction rate in the optical component itself is fixed by the material, there is a problem that it is impossible to arbitrarily change it according to the reduction rate required by the user.

  Therefore, the present invention has been made in view of the above-mentioned problems, and one example of the problem is harmful blue light in a mode that matches the characteristics of the image itself to be displayed and the user's preference for displaying the image. Is to provide an image processing device, a display device, an image processing method, and a program for the image processing device capable of reducing the risk of protecting a user's eyes.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the acquisition unit such as a blue light reduction control unit that acquires image information corresponding to an image to be displayed on a display unit such as a display, and the acquired Each of the luminances is reduced to generate display image information so that the luminance reduction rate corresponding to the blue component in the image information is equal to or higher than the luminance reduction rate corresponding to the other color components in the image information, And a processing unit such as a pixel value updating unit that performs luminance control processing to be output to the display unit for display.

  In order to solve the above-mentioned problem, an invention according to claim 12 acquires the image processing apparatus according to any one of claims 1 to 11 and the display image information, and performs the display. And the display means for displaying an image corresponding to the image information for use.

  In order to solve the above-mentioned problem, the invention according to claim 13 corresponds to an acquisition step of acquiring image information corresponding to an image to be displayed on a display means such as a display, and a blue component in the acquired image information. Generating the display image information by reducing each of the luminances so that the luminance reduction rate to be equal to or higher than the luminance reduction rate corresponding to the other color components in the image information is output to the display means. Processing steps to be displayed.

  In order to solve the above-described problem, the invention according to claim 14 is an acquisition means for acquiring image information corresponding to an image to be displayed on a display means such as a display by a computer included in the image processing apparatus, and Display image information is generated by reducing each luminance so that the luminance reduction rate corresponding to the blue component in the acquired image information is equal to or higher than the luminance reduction rate corresponding to the other components in the image information. And it is made to function as a processing means for outputting and displaying on the display means.

  According to the invention described in claim 1 or claims 12 to 14, the reduction rate of the luminance corresponding to the blue component in the image information corresponding to the image to be displayed is different from the other color components. The display image information is generated and displayed by reducing each luminance so as to be equal to or higher than the corresponding luminance reduction rate. Therefore, harmful blue components can be reduced by image processing without separately using an optical member or the like for reducing blue components.

  In order to solve the above-described problem, according to a second aspect of the present invention, in the image processing apparatus according to the first aspect, the blue component is a B component in an RGB (Red Green Blue) color space. The color components are an R component and a G component in the RGB color space, and the processing unit is configured to reduce the luminance corresponding to the B component and the luminance of the luminance corresponding to the R component and the G component, respectively. The display image information is generated by reducing the luminance corresponding to the B component so as to be larger than the reduction rate, and is output to the display means for display.

  According to the invention described in claim 2, in addition to the operation of the invention described in claim 1, the luminance reduction rate corresponding to the B component in the RGB color space is reduced in each of the R component and the G component in the RGB color space. Display image information is generated and displayed by reducing the luminance corresponding to the B component so as to be larger than the corresponding luminance reduction rate. Therefore, harmful blue components can be reduced without separately using an optical member or the like that reduces the B component.

  In order to solve the above-mentioned problem, the invention according to claim 3 is the image processing apparatus according to claim 2, wherein as the luminance control process, the processing means is configured to determine that the B component in the pixels constituting the image is The display image information is generated by increasing the luminance reduction rate corresponding to the B component as it is larger than the R component and the G component in the pixel.

  According to the invention described in claim 3, in addition to the operation of the invention described in claim 2, the luminance corresponding to the B component increases as the B component in the pixels constituting the image is larger than the R component and the G component. Display image information is generated by increasing the reduction rate. Therefore, by reducing the B component in consideration of the balance between the RGB color components, it is possible to prevent the color of the entire image from changing by reducing the B component as the B component increases. However, harmful blue components can be reduced.

  In order to solve the above-described problem, the invention according to claim 4 is the image processing apparatus according to claim 2 or 3, wherein the processing means includes the R component and the G component as the luminance control processing. The display image information is generated by setting the luminance reduction rate corresponding to each of the luminance reduction rates corresponding to the B component to one-quarter or more and one-half or less.

  According to the invention described in claim 4, in addition to the operation of the invention described in claim 2 or claim 3, the luminance reduction rate corresponding to each of the R component and G component is set to the luminance corresponding to the B component. The reduction rate is set to a quarter or more and a half or less. Therefore, by reducing the R component and the G component in consideration of the balance with respect to the B component, it is possible to reduce harmful blue components while preventing the color of the entire image from changing.

  In order to solve the above-described problem, the invention according to claim 5 is the image processing apparatus according to claim 1, wherein the blue component is the hue in a color space including three elements including hue and saturation. The other color component is a color component other than the B component in the hue, and the processing means has the reduction rate of the luminance corresponding to the B component in the hue. The display image information is generated by reducing the luminance corresponding to the B component so as to be equal to or higher than the reduction rate of the luminance corresponding to the color components other than the B component, and output to the display means Configured to be displayed.

  According to the invention described in claim 5, in addition to the operation of the invention described in claim 1, the reduction rate of the luminance corresponding to the B component in the hue in the color space composed of three elements including the hue and the saturation. The display image information is generated by reducing the luminance corresponding to the B component so as to be equal to or higher than the reduction rate of each luminance corresponding to each color component other than the B component in the hue in the color space. Let Therefore, harmful blue components can be reduced without separately using an optical member or the like that reduces the B component.

  In order to solve the above-described problem, according to a sixth aspect of the present invention, in the image processing apparatus according to the fifth aspect, as the luminance control process, the processing means includes the B component in the hue and the hue in the hue. The display image information is generated with the same reduction ratios of the luminances corresponding to the color components other than the B component.

  According to the invention described in claim 6, in addition to the action of the invention described in claim 5, the reduction rate of each luminance corresponding to each of the B component in the hue and the color component other than the B component in the hue is obtained. Display image information is generated as if they were all the same. Therefore, since all the color components are reduced equally, for example, the B component can be reduced while preventing the change in the white color on the display, and the harmful blue component can be reduced without any change in the color. .

  In order to solve the above-mentioned problem, the invention according to claim 7 is the image processing apparatus according to claim 5, wherein when the image corresponding to the acquired image information is an achromatic color, the brightness control process is performed. The processing unit is configured to generate the display image information by reducing only elements other than the hue and the saturation in the color space.

  According to the invention described in claim 7, in addition to the operation of the invention described in claim 5, when the image corresponding to the acquired image information is achromatic, elements other than hue and saturation in the color space Since the image information for display is generated by reducing only the image, the user's eyes can be protected even when the image is achromatic.

  In order to solve the above problem, an invention according to an eighth aspect is the image processing apparatus according to any one of the fifth to seventh aspects, wherein the color space has an HLS (Hue, Luminance, Saturation). ) A color space or an HSV (Hue, Saturation, Value) color space.

  According to the invention described in claim 8, in addition to the operation of the invention described in any one of claims 5 to 7, the color space is either the HLS color space or the HSV color space. In addition, it is possible to reduce harmful blue components while preventing a change in color on the display of colors including white.

  In order to solve the above-mentioned problem, an invention according to claim 9 detects an average luminance in the entire image to be displayed in the image processing apparatus according to any one of claims 1 to 8. The apparatus further includes detection means such as a blue light reduction control unit, and the processing means is configured to perform the luminance control process when the detected average luminance is equal to or higher than a preset luminance.

  According to the invention described in claim 9, in addition to the operation of the invention described in any one of claims 1 to 8, the brightness control process is performed when the average brightness in the entire image is equal to or higher than a predetermined brightness. As a result, harmful blue components can be reduced without impairing the color or impression of the entire image.

  In order to solve the above problem, an invention according to claim 10 is the image processing apparatus according to any one of claims 2 to 8, wherein the processing means corresponds to the brightness control process. A storage unit such as a recording unit that stores in advance luminance information indicating at least the luminance reduction rate corresponding to the B component, and a selection unit such as an operation unit used to select the stored luminance information; And the processing means is configured to perform the luminance control processing using the selected luminance information.

  According to the invention described in claim 10, in addition to the operation of the invention described in any one of claims 2 to 8, the luminance information stored in the storage means is selected by the selection means. Since the luminance control processing is performed using the luminance information, harmful blue components can be reduced in a manner in line with the user's intention.

  In order to solve the above-described problem, the invention according to claim 11 is the display area of the display means in which the image is displayed in the image processing apparatus according to any one of claims 1 to 10. The image processing apparatus further includes a region selection unit such as an operation unit used for selecting a part of the image processing unit, and the processing unit is configured to perform the luminance control process on only the selected part.

  According to the invention described in claim 11, in addition to the operation of the invention described in any one of claims 1 to 10, the luminance is targeted for only a part of the display area selected by the area selecting means. Since the control process is performed, a part of the display area that is the target of the brightness control process can be selected, so that harmful blue components can be reduced in a manner that matches the user's preference.

  According to the present invention, each luminance is set so that the luminance reduction rate corresponding to the blue component in the image information corresponding to the image to be displayed is equal to or higher than the luminance reduction rate corresponding to the other color component in the image information. Display image information is generated and displayed.

  Therefore, the harmful blue component can be reduced by image processing without using an optical member or the like that reduces the blue component separately, which matches the characteristics of the image itself to be displayed and the user's preference for displaying the image. In this manner, the harmful blue component can be reduced to protect the user's eyes.

1 is a block diagram illustrating a schematic configuration of a display device according to a first embodiment. It is a figure which shows the blue light reduction process which concerns on 1st Embodiment, (a) is a figure which shows the difference in the brightness | luminance of each color, (b) is a figure explaining the reduction | decrease of the blue light in RGB color space. . It is a figure which illustrates the difference of each reduction rate concerning a 1st embodiment. It is a flowchart which shows the blue light reduction process which concerns on 1st Embodiment. It is a figure which illustrates the case where the blue light reduction process which concerns on 1st Embodiment is performed for every area | region, (a) is a figure which shows a 1st example, (b) is a figure which shows a 2nd example. It is a figure which shows the other example of the blue light reduction process which concerns on 1st Embodiment, (a) is a figure which shows the difference in the brightness | luminance of each color, (b) demonstrates reduction of the blue light in RGB color space. It is a figure to do. It is a figure which shows the further another example of the reduction process of the blue light which concerns on embodiment using RGB color space. It is a figure (I) explaining the principle of 2nd Embodiment, (a) is a figure which shows the concept of HLS color space, (b) is a figure which shows the concept of HSV color space. It is a figure (II) explaining the principle of 2nd Embodiment, (a) is a figure explaining the reduction process (I) of the blue light in HLS color space, (b) is the figure of the blue light in HLS color space. It is a figure explaining reduction processing (II). It is a figure (III) explaining the principle of 2nd Embodiment, (a) is a figure explaining the reduction process (I) of the blue light in HSV color space, (b) is the figure of the blue light in HSV color space. It is a figure explaining reduction processing (II). It is a block diagram which shows schematic structure of the display apparatus which concerns on 2nd Embodiment. It is a figure which shows the blue light reduction process which concerns on 2nd Embodiment, (a) is a figure which shows the difference in the brightness | luminance of each color, (b) is a figure explaining the reduction | decrease of the blue light in the hue of HLS color space. It is. It is a flowchart which shows the blue light reduction process which concerns on 2nd Embodiment. It is a figure which shows the other example of the reduction process of the blue light which concerns on 2nd Embodiment, (a) is a figure which shows the difference in the brightness | luminance of each color, (b) is reduction of the blue light in the hue of HLS color space. FIG. It is figure (I) which illustrates the effect of the present invention, (a) illustrates the effect over a wide wavelength, and (b) illustrates the effect about the wavelength of blue light. It is figure (II) which illustrates the effect of the present invention, (a) illustrates the effect over a wide wavelength, and (b) illustrates the effect about the wavelength of blue light. It is figure (III) which illustrates the effect of the present invention, (a) illustrates the effect over a wide wavelength, and (b) is a diagram illustrating the effect on the wavelength of blue light.

  Next, a mode for carrying out the present invention will be described with reference to FIGS. Each embodiment described below is an embodiment when the present invention is applied to a blue light reduction process in a display device that displays an image including a moving image and a still image.

(I) First Embodiment First, a first embodiment according to the present invention will be described with reference to FIGS. 1 is a block diagram illustrating a schematic configuration of the display device according to the first embodiment, FIG. 2 is a diagram illustrating a blue light reduction process according to the first embodiment, and FIG. 3 is a diagram illustrating the first embodiment. It is a figure which illustrates the difference of each reduction rate concerning. Further, FIG. 4 is a flowchart showing the reduction process, FIG. 5 is a diagram illustrating a case where the reduction process is performed for each region, and FIG. Furthermore, FIG. 7 is a diagram illustrating still another example of the reduction process using the RGB color space. In the following description, the blue light reduction processing according to the first embodiment is simply referred to as “reduction processing according to the first embodiment”.

  As shown in FIG. 1, the display device D1 according to the first embodiment includes an image generation unit 1, a keyboard, a mouse, a touch panel, or the like, and an operation unit that generates an operation signal Sop that specifies processing as the display device D1. 2, a blue light reduction control unit 3, a correction target range setting unit 4, a recording unit 5 that records a reduction rate table, which will be described later, in a nonvolatile manner, a pixel value update unit 6, It is comprised by the switching part 7 and the display 8 which consists of a liquid crystal display etc. which have the backlight which is LED.

  At this time, the display 8 corresponds to an example of “display means” according to the present invention, and the blue light reduction control unit 3 corresponds to an example of “acquisition means” and an example of “detection means” according to the present invention, The pixel value update unit 6 corresponds to an example of a “processing unit” according to the present invention. The recording unit 5 corresponds to an example of a “storage unit” according to the present invention, and the operation unit 2 corresponds to an example of a “selection unit” and an example of an “area selection unit” according to the present invention.

  In this configuration, the image generation unit 1 generates image information Sin corresponding to an image to be displayed on the display 8 (including at least one of a still image and a moving image; the same applies hereinafter) to generate a blue light reduction control unit 3. Output to. On the other hand, the recording unit 5 is a preset reduction rate table for reduction processing according to the first embodiment, and includes a reduction rate table including at least a reduction rate parameter used when reducing the B component in the image. In a non-volatile manner, n (n is a natural number) are recorded. Each reduction rate table will be described in detail later.

  On the other hand, the operation unit 2 is an on / off signal indicating whether or not to perform the reduction process according to the first embodiment based on the user's operation, and in the image that is the target of the reduction process when the reduction process is executed. The operation signal Sop each including a range designation signal indicating the range of the above and a table designation signal for designating the reduction rate table used for the reduction process when the reduction process is executed is generated. The operation unit 2 sends the on / off signal to the blue light reduction control unit 3 and the switching unit 7, the range designation signal to the correction target range setting unit 4 and the switching unit 7, and the table designation signal to the recording unit. 5 respectively. At this time, if the image displayed on the display 8 is, for example, an image corresponding to a movie, an operation for not executing the reduction processing according to the first embodiment is performed on the operation unit 2 in order to maintain the image quality and the like. Is preferred. On the other hand, when the image displayed on the display 8 is an image corresponding to, for example, an office document, an operation for executing the reduction process according to the first embodiment to effectively reduce blue light is performed. It is preferably performed in the operation unit 2. Further, when the reduction process according to the first embodiment is executed, the table specifying signal reflecting the operation for selecting the reduction rate is generated / output.

  Thereby, the blue light reduction control unit 3 determines whether or not to perform the reduction process according to the first embodiment for the image information Sin based on the on / off signal from the operation unit 2, and if so, the image is displayed. The information Sin is output to the correction target range setting unit 4. On the other hand, when the reduction process is not executed, the brule light reduction control unit 3 outputs the image information Sin to the switching unit 7 as it is.

  Next, based on the range designation signal from the operation unit 2, the correction target range setting unit 4 uses the image information Sin as a pixel value update unit for the pixels of the image information Sin that are subject to reduction processing according to the first embodiment. 6 is output. On the other hand, for the pixels of the image information Sin other than the pixels to be reduced, the image information Sin is output to the switching unit 7 as it is.

  On the other hand, the recording unit 5 outputs the reduction rate parameter included in the reduction rate table designated by the table designation signal from the operation unit 2 to the pixel value update unit 6.

Accordingly, the pixel value update unit 6 allows the pixel values of the B component, the R component, and the G component in each pixel included in the image information Sin output from the correction target range setting unit 4 (more specifically, (E.g., luminance) is updated to the pixel value indicated by the reduction rate table output from the recording unit 5 and output to the switching unit 7 as updated image information Sbc. Here, the upper limit value of the pixel value (or luminance) is determined by the number of gradations, and when the display 8 is configured by a liquid crystal display, the upper limit value is three colors for a RGB 24-bit liquid crystal display. a for each color component "255 ⁽² 8 -1)", the upper limit value if 18-bit LCD display with RGB is "63 ⁽² 6 -1)" for each color component of the three colors.

  Based on the on / off signal and the range designation signal from the operation unit 2, the switching unit 7 performs blue light reduction control for the image information Sin of the pixels that are not subjected to reduction processing according to the first embodiment. The unit 3 or the correction target range setting unit 4 is switched to the display information Sout as it is and output to the display 8 as it is. On the other hand, the image information Sin of the pixel that is the target of the reduction process according to the first embodiment is switched to the pixel value update unit 6 side, and the updated image information Sbc is output to the display 8 as the display information Sout. To do.

  Finally, the display 8 displays an image corresponding to the display information Sout output from the switching unit 7.

  Next, the reduction rate table used for the reduction process according to the first embodiment will be described with reference to FIG.

  In the reduction process according to the first embodiment, the blue light in the image corresponding to the image information Sin is reduced by the color adjustment process as the display device D1, without using the special optical component described as the background art separately. . The “reduction rate” in the following description is a parameter defined by the following equation, where each pixel value of the input image (image information Sin) when the reduction process according to the first embodiment is not performed is “1”. is there.

Reduction rate [%] = {1− (output pixel value / input pixel value)} × 100
At this time, since the brightness of the backlight and the brightness of the displayed image may not be proportional, the reduction rate as image information and the energy generated from the display 8 when the image is actually displayed on the display 8 Note that this is different from the reduction rate.

  That is, as illustrated in FIG. 2A, when the horizontal axis is an input pixel value and the vertical axis is an output pixel value, the reduction processing according to the first embodiment is indicated by a broken line in FIG. For the original image (that is, the image corresponding to the image information Sin), the pixel value update unit 6 is configured so that the reduction rate of the B component is larger than the reduction rates of the other color components (R component and G component). The brightness of each color component is updated and the updated image information Sbc is output to the switching unit 7. This reduction process is executed for each pixel, for example. Here, the wavelength of the B component is, for example, about 440 nanometers to 490 nanometers, the wavelength of the R component is, for example, about 620 nanometers to 740 nanometers, and the wavelength of the G component is, for example, about 500 nanometers to It is about 600 nanometers. In FIG. 2A, if the graph of the R component and the G component is expressed by, for example, output pixel value = input pixel value × 0.9, the reduction rate for each of the R component and G component is 10% ((1 −0.9) × 100), and if the B component graph is expressed by, for example, output pixel value = input pixel value × 0.75, the reduction rate of the B component is 25% ((1-0.75). ) × 100). On the other hand, when the reduction process illustrated in FIG. 2A is expressed in the RGB color space, for example, it is illustrated in FIG. As is clear from FIG. 2B, in the reduction processing according to the first embodiment, not only the B component but also the R component and the G component are reduced, respectively. It is assumed that it is larger than the color component.

  In FIG. 2A, it is possible to reduce only the B component, but in that case, the color of the entire image changes (more specifically, yellowish), It is not preferable as the display device D1. Therefore, in the reduction process according to the first embodiment, not only the B component but also the R component and the G component are reduced as illustrated in FIG. And the reduction rate in each of the R component and G component at this time is set to, for example, one quarter or more and one half or less of the reduction rate in the B component. More specifically, for example, when the reduction rate for the B component is 10 percent, the reduction rates for the R component and the G component are each 2.5 percent or more and 5 percent or less. Thereby, harmful blue light can be reduced while suppressing a change in color of the entire image. At this time, depending on the content of the image, the above-described reduction of only the B component may be performed (in other words, the reduction rate in each of the R component and the G component is zero (the R component and the G component are not reduced). ) If possible. Also in this case, the display device D1 according to the first embodiment can make this possible by selecting a reduction rate table for reducing only the B component.

  In the recording unit 5 of the display device D1 according to the first embodiment, the reduction rate table including reduction rate parameters respectively indicating different reduction rates for the purpose of the reduction processing according to the first embodiment illustrated in FIG. For example, as illustrated in FIG. 1, the first reduction rate table T1, the second reduction rate table T2, the third reduction rate table T3,..., And the nth reduction rate table Tn are recorded in advance. At this time, as for the difference in the reduction rate in each reduction rate table, for example, as illustrated in FIG. 3, as the number as the reduction rate table increases, the reduction rate in line with the spirit illustrated in FIG. Each color component is recorded in advance. The actual value of the reduction rate parameter in each reduction rate table may be determined in advance experimentally or empirically, for example.

  Next, the reduction process according to the first embodiment will be described more specifically with reference to FIGS. 4 and 5.

  As shown in FIG. 4, in the reduction process according to the first embodiment, when the image information Sin is input from the image generation unit 1, it is first taken into the blue light reduction control unit 3 (step S1). Then, the blue light reduction control unit 3 determines whether or not to perform the reduction process according to the first embodiment on the image information Sin based on the on / off signal from the operation unit 2 (step S2). When the reduction process is executed in the determination in step S2 (step S2; YES), the blue light reduction control unit 3 outputs the image information Sin to the correction target range setting unit 4. On the other hand, when the reduction process is not executed in the determination of step S2 (step S2; NO), the blue light reduction control unit 3 outputs the image information Sin as it is to the switching unit 7 (step S6).

  Next, the correction target range setting unit 4 determines, in the image information Sin, a pixel that is a target of reduction processing according to the first embodiment and other pixels based on the range designation signal from the operation unit 2 ( Step S3). More specifically, for example, when the range designation signal indicates that the pixels included in the range AR illustrated in FIG. 5A are to be subjected to reduction processing according to the first embodiment, the correction target range setting is performed. The unit 4 outputs the image information Sin to the pixel value update unit 6 for the pixels in the range AR (step S3; YES). On the other hand, for the pixels other than the pixels in the range AR (step S3; NO), the image information Sin is output to the switching unit 7 as it is (step S6). In this case, as illustrated in FIG. 5B, a range AR including an image that is not targeted for reduction processing according to the first embodiment is designated by the range designation signal from the operation unit 2, and other than this range AR. It is also possible to configure the pixels included in this range to be subject to reduction processing according to the first embodiment.

  In parallel with these, the recording unit 5 selects the reduction rate table (in other words, specifies the reduction rate) indicated by the table designation signal from the operation unit 2 (step S4), and the table designation signal. The reduction rate parameter included in the reduction rate table specified by is output to the pixel value update unit 6.

  Accordingly, the pixel value update unit 6 outputs the pixel values of the B component, the R component, and the G component in each pixel included in the image information Sin output from the correction target range setting unit 4 from the recording unit 5. The pixel value indicated by the reduced rate table is updated (step S5) and output to the switching unit 7 as updated image information Sbc.

  The switching unit 7 switches between the blue light reduction control unit 3 or the correction target range setting unit 4 side and the pixel value update unit 6 side based on the on / off signal and the range designation signal from the operation unit 2, The display information Sout is output and displayed on the display 8 (step S6).

  As described above, according to the reduction process according to the first embodiment, for example, the luminance reduction rate corresponding to the B component in the image information Sin corresponding to the image to be displayed is the R component and the G component in the image information. For example, display information Sout is generated and displayed by reducing at least the luminance corresponding to the B component so as to be larger than the corresponding luminance reduction rate. Therefore, harmful blue light can be reduced by image processing without separately using an optical member or the like for reducing the B component.

  In addition, since the reduction rate corresponding to each of the R component and the G component is set to ¼ to ½ of the reduction rate corresponding to the B component, the R component and the G component are set in consideration of the balance with respect to the B component. By reducing this, harmful blue light can be reduced while preventing the color of the entire image from changing.

  Furthermore, since the reduction process is performed using the reduction rate table selected by the operation of the operation unit 2 among the reduction rate tables recorded in the recording unit 5, harmful blue light can be generated in a manner in line with the user's intention. Can be reduced.

  Furthermore, when the reduction process according to the first embodiment is performed only on the range selected by the operation unit 2, the range targeted for the reduction process can be selected, which matches the user's preference. In embodiments, harmful blue light can be reduced. In this case, as illustrated in FIG. 5, in addition to the user specifying the range to be reduced according to the first embodiment, for example, an image (for example, a document to be reduced) according to the first embodiment Or a so-called window in which an image that is not targeted for the reduction process (for example, a movie image) is displayed can also be configured. In this case, when the window is moved, the position in the display 8 of the pixel that is the target of the reduction process (or is not the target) itself changes, but the image displayed in the window is always Control can be performed so as to be a target (or not a target) of the reduction process.

  In addition, about the reduction process which concerns on 1st Embodiment, aspects other than having mentioned above are possible.

  For example, in the first embodiment described above, the case where the reduction rate for each color component is linearly changed as illustrated with reference to FIG. 2 or FIG. 3 has been described, but other than this, for example, FIG. As illustrated in FIG. 6, the reduction rate can be increased as the luminance in the input image information Sin increases. In this case, if the reduction process illustrated in FIG. 6A is expressed in the RGB color space, for example, as illustrated in FIG. 6B, the reduction rate changes unevenly. Such a reduction process can be realized by changing the content of the reduction rate parameter included in the reduction rate table according to the first embodiment.

  Further, as illustrated in FIG. 7, R, G, and B are not set independently, but, for example, even when an image to be subjected to reduction processing according to the first embodiment includes a large amount of B component. Similarly, if the R component or G component is large, the reduction rate as the B component is lowered, and if the R component or G component is small (in other words, if the image (pixel) is closer to pure “blue”). It is also possible to increase the reduction rate as blue. In this case, since the display information Sout is generated by increasing the reduction rate corresponding to the B component as the B component in the pixels constituting the image is larger than the R component and the G component, more pixels are present in the B component. By reducing the B component, the B component can be reduced in consideration of the balance between the color components, and harmful B component can be reduced while preventing the color of the entire image from changing.

  Further, for example, as another aspect in which the aspect described with reference to FIG. 7 is applied, the RGB color space is converted into a color space such as an HLS (Hue Luminance Saturation) space or an HSV (Hue Value Saturation) color space, and R, In consideration of not only the three primary colors G and B but also cyan, magenta, yellow, etc., the reduction rate is controlled for each color space to efficiently reduce blue light, and the display is converted back to the RGB color space. It can also be configured to be displayed. Therefore, an embodiment in which the present invention is implemented using the above HLS color space or HSV color space will be described below as a second embodiment according to the present invention.

(II) Second Embodiment Next, the second embodiment will be described with reference to FIGS. 8 to 10 are diagrams for explaining the principle and the like of the second embodiment, FIG. 11 is a block diagram showing a schematic configuration of a display device according to the second embodiment, and FIG. 12 is a diagram showing the second embodiment. It is a figure which shows the reduction process of the blue light which concerns on. FIG. 13 is a flowchart illustrating the reduction process, and FIG. 14 is a diagram illustrating another example of the reduction process. In the following description, the blue light reduction processing according to the second embodiment is simply referred to as “reduction processing according to the second embodiment”.

(A) About the HLS color space and the HSV color space First, the concept of the HLS color space and the HSV color space according to the second embodiment will be described with reference to FIG. Note that the HLS color space and the HSV color space itself are generally known color spaces together with the RGB color space according to the first embodiment for image processing.

  First, as shown in FIG. 8 (a), the concept is shown in the form of a vertical cone, the HLS color space used for the reduction processing according to the second embodiment includes a hue (Hue) axis H, a luminance (Luminance) axis L, and saturation. (Saturation) The axis S is constituted.

  Of these, the hue axis H is an axis representing the so-called “color” by an angle in the range of 0 degrees to 360 degrees. As illustrated in FIG. 8A, the R (Red) component, G ( Besides C (Cyan) component, M (Magenta) component and Y (Yellow) component in addition to Green (green) component and B (Blue) component . At this time, for example, 0 degree is the R component, and 180 degrees located on the opposite side on the hue axis H is a blue-green component corresponding to the opposite color of the R component. Using the HLS color space makes it easy to find the opposite color. The wavelength of the B component is, for example, about 440 nanometers to 490 nanometers, the wavelength of the R component is, for example, about 620 nanometers to 740 nanometers, and the wavelength of the G component is, for example, 500 nanometers to 600 nanometers. It is about nanometer. The C component is a component composed of the G component and the B component, the M component is a component composed of the R component and the B component, and the Y component is composed of the R component and the G component. It is the component which consists of.

  Next, the saturation axis S represents “color vividness” in the range of 0% (center axis itself) to 100% (outermost circumference) in relation to the distance from the luminance axis L (center axis of the HLS color space). It is an axis, and the fact that saturation falls from pure color is a concept based on the idea of approaching gray.

  Finally, the luminance axis L is an axis representing “brightness of color” in the range of 0% to 100%, luminance 0% (the bottom end in FIG. 8A) is “black”, and luminance 100% ( In FIG. 8A, the uppermost end) is “white”, and the middle (the position of the disk representing the hue axis H) is 50%, which represents a pure color.

  Next, as shown in FIG. 8B in a cylindrical shape, the HSV color space used for the reduction processing according to the second embodiment includes a hue (Hue) axis H and a lightness (or luminance) (Value) axis. It is constituted by V and a saturation axis S.

  Of these, the hue axis H is basically the same axis as the hue axis H of the HLS color space, and the color type is represented by an angle in the range of 0 to 360 degrees, and the R component, the G component, and the B component. In addition, a C component, an M component, and a Y component are included.

  Next, similarly to the saturation axis S of the HLS color space, the saturation axis S is 0% (the central axis itself) to 100% in terms of the distance from the lightness axis V (the central axis of the HSV color space). This is an axis representing “color vividness” in the range of (outermost circumference).

  Finally, the lightness axis V is an axis representing “brightness of color” in a range of 0% to 100%, similar to the luminance axis L of the HLS color space. At this time, the brightness axis V indicates how much brightness is lost from a pure color with a brightness of 100%, whereas the brightness axis L of the HLS color space is “black” with 0% brightness as described above. There is a difference that “white” has a luminance of 100% and an intermediate luminance of 50% is a pure color. In this regard, it can be said that 50% or less of the luminance axis L in the HLS color space corresponds to the lightness axis V of the HSV color space, and 50% or more of the luminance axis L corresponds to the saturation axis S of the HSV color space.

(B) Principle of Second Embodiment Next, the principle of the reduction process according to the second embodiment applied to the HLS color space or HSV color space will be described for each color space with reference to FIGS. 9 and 10. .

  First, when the reduction processing according to the second embodiment is performed on white (achromatic color) in the HLS color space, the luminance on the luminance axis L is illustrated as illustrated by a broken line and a solid line in FIG. For example, by reducing the level from the level of the broken line ◯ to the level of the solid line ◯, the blue light can be reduced without changing the color on the display by the display 8. On the other hand, when the reduction processing according to the second embodiment is performed on the B component of the HLS color space, the level of only the B component on the hue axis H is exemplified by the broken line ○ and the solid line ○ in FIG. By reducing the above, it is possible to reduce blue light while suppressing changes in the color on the entire display by reducing the influence on other color components (for example, the C component and the M component).

  On the other hand, when the reduction processing according to the second embodiment is performed on white (achromatic color) in the HSV color space, the case of the HLS color space as illustrated by the broken line ○ and the solid line ○ in FIG. Similarly to the above, by reducing the luminance on the luminance axis L from, for example, the level of the broken line ◯ to the level of the solid line ◯, the blue light can be reduced without changing the color on the display by the display 8. Further, when the reduction processing according to the second embodiment is performed on the B component of the HSV color space, as illustrated by the broken line ○ and the solid line ○ in FIG. 10B, this is the same as in the case of the HLS color space. In addition, by reducing the level of only the B component on the hue axis H, it is possible to reduce blue light while suppressing changes in the overall color tone by reducing the effect on other color components. is there.

(C) Configuration and operation of the display device according to the second embodiment Next, the configuration and operation of the display device according to the second embodiment that executes the reduction process according to the second embodiment using the principle described above. This will be specifically described with reference to FIGS. 11 to 14, the same members or the same steps as those of the display device D1 according to the first embodiment are denoted by the same member numbers or the same step numbers, and detailed description thereof is omitted. Further, in the following description, a case where the HLS color space is used as an example of the reduction process according to the second embodiment will be described.

  As illustrated in FIG. 11, the display device D2 according to the second embodiment includes an image generation unit 1, an operation unit 2, and blue light reduction control that have the same configuration and functions as the display device D1 according to the first embodiment. In addition to the unit 3, the correction target range setting unit 4, the recording unit 5, the switching unit 7, and the display 8, the pixel value update unit 60 according to the second embodiment, the color space conversion unit 61 according to the second embodiment, And a color space inverse transform unit 62 according to the second embodiment. In addition, about the recording part 5, the reduction rate table currently recorded on it is a preset reduction rate table for the reduction process which concerns on 2nd Embodiment, Comprising: It uses when reducing B component in the said image. The difference is from the recording unit 5 of the display device D1 according to the first embodiment in that the reduction rate table includes at least a reduction rate parameter. Each reduction rate table according to the second embodiment will be described in detail later.

  In the display device D2 according to the second embodiment having the above configuration, the image information Sin output from the image generation unit 1 corresponds to the RGB color space as in the case of the display device D1 according to the first embodiment. Includes color data and the like. Then, based on the range designation signal from the operation unit 2, the correction target range setting unit 4 converts the image information Sin into the color space conversion unit 61 for the pixels of the image information Sin to be subjected to reduction processing according to the second embodiment. Output to. On the other hand, for the pixels of the image information Sin other than the pixels to be reduced, the image information Sin is output to the switching unit 7 as it is.

  Then, the color space conversion unit 61 converts the color space corresponding to the image information Sin output from the correction target range setting unit 4 from the RGB color space to the HLS color space, and the image information Sin corresponding to the converted HLS color space. Is output to the pixel value update unit 60. Note that the color space conversion processing (conversion processing from the RGB color space to the HLS color space) itself in the color space conversion unit 60 is the same as the conventional conversion processing, and thus detailed description thereof is omitted.

  On the other hand, from the recording unit 5, the reduction rate parameter included in the reduction rate table designated by the table designation signal from the operation unit 2 is output to the pixel value update unit 60.

  As a result, the pixel value update unit 60 has at least the B component pixel value of the HLS color space (more specifically, for example, luminance) in each pixel included in the image information Sin output from the color space conversion unit 61. ) Is updated to the pixel value indicated by the reduction rate table output from the recording unit 5 and output to the color space inverse conversion unit 62 as updated image information Sbc. The update of the pixel value in this case is an update of the pixel value based on the principle illustrated in FIG.

  Then, the color space inverse conversion unit 62 inversely converts the color space corresponding to the updated image information Sbc output from the pixel value update unit 60 from the HLS color space to the RGB color space, and corresponds to the RGB color space after the reverse conversion. The updated image information Sbc is output to the switching unit 7. Note that the color space reverse conversion process (inverse conversion process from the HLS color space to the RGB color space) itself in the color space reverse conversion unit 62 is the same as the conventional reverse conversion process, and thus detailed description thereof is omitted.

  Based on the on / off signal and the range designation signal from the operation unit 2, the switching unit 7 performs blue light reduction control for the image information Sin of the pixels that are not subjected to reduction processing according to the second embodiment. The unit 3 or the correction target range setting unit 4 is switched to the display information Sout as it is and output to the display 8 as it is. On the other hand, the image information Sin of the pixel that is the target of the reduction process according to the second embodiment is switched to the color space inverse transform unit 62 side, and the updated image information Sbc according to the second embodiment is displayed as the display information. The data is output to the display 8 as Sout.

  Finally, the display 8 displays an image corresponding to the display information Sout output from the switching unit 7.

  Next, the said reduction rate table used for the reduction process which concerns on 2nd Embodiment is demonstrated using FIG.

  In the reduction process according to the second embodiment, similarly to the reduction process according to the first embodiment, the color adjustment process as the display device D2 corresponds to the image information Sin without using the special optical component separately. Reduce blue light in the image.

  That is, as illustrated in FIG. 12A, when the horizontal axis is an input pixel value and the vertical axis is an output pixel value, the reduction processing according to the second embodiment is indicated by a broken line in FIG. For the original image (that is, the image corresponding to the image information Sin), the reduction rate of the B component on the hue axis H (see FIG. 8 or FIG. 9) is greater than the reduction rate of the other color components on the hue axis H. In addition, the pixel value update unit 60 updates the luminance of each color component of the hue axis H and outputs the updated image information Sbc to the switching unit 7. At this time, the case where the reduction rate of the B component on the hue axis H is the same as the reduction rate of the other color components on the hue axis H corresponds to the principle described with reference to FIG. On the other hand, when the reduction rate of the B component on the hue axis H is made larger than the other color components on the hue axis H, or when only the B component on the hue axis H is reduced, the principle described with reference to FIG. Equivalent to. These reduction processes are executed for each pixel, for example. In addition, when the reduction process illustrated in FIG. 12A is expressed in the HLS color space, for example, the reduction process illustrated in FIG. As is clear from FIG. 12B, when only the B component on the hue axis H is reduced in the reduction process according to the second embodiment, the color components other than the B component on the hue axis H are not reduced. In this case, other color components other than the B component may be reduced using a reduction rate lower than the reduction rate for the B component.

  In the recording unit 5 of the display device D2 according to the second embodiment, the reduction rate table including reduction rate parameters respectively indicating different reduction rates for the purpose of the reduction processing according to the second embodiment illustrated in FIG. For example, as illustrated in FIG. 11, the first reduction rate table TT1, the second reduction rate table TT2, the third reduction rate table TT3,..., And the nth reduction rate table TTn are recorded in advance. At this time, the difference in the reduction rate in each reduction rate table is illustrated in FIG. 12 as a reduction rate that increases as the number as the reduction rate table increases, for example, as described with reference to FIG. 3 in the first embodiment. The reduction rate according to the purpose is recorded in advance for each color component. The actual value of the reduction rate parameter in each reduction rate table may be determined in advance experimentally or empirically, for example.

  Next, the reduction process according to the second embodiment will be described more specifically with reference to FIG.

  As shown in FIG. 13, in the reduction process according to the second embodiment, first, steps S1 to S3 similar to the reduction process according to the first embodiment are executed.

  Next, for example, the above range from the operation unit 2 indicates that pixels included in the range AR similar to the range AR illustrated in FIG. 5A in the first embodiment are targeted for reduction processing according to the second embodiment. When indicated by the designation signal, the correction target range setting unit 4 outputs the image information Sin to the color space conversion unit 61 for the pixels in the range AR (step S3; YES). On the other hand, for pixels other than the pixels in the range AR (step S3; NO), the correction target range setting unit 4 outputs the image information Sin as it is to the switching unit 7 (step S6). In this case, as in the case illustrated in FIG. 5B in the first embodiment, a range AR including an image that is not an object of reduction processing according to the second embodiment is determined by the range designation signal from the operation unit 2. It is also possible to designate and include pixels included in a range other than the range AR as a target of reduction processing according to the second embodiment.

  Next, the color space conversion unit 61 performs the conversion process from the RGB color space to the HLS color space described above on the image information Sin output from the correction target range setting unit 4 to convert the color space to the HLS color space. The processed image information Sin is output to the pixel value update unit 60 (step S10).

  In parallel with these, the recording unit 5 selects the reduction rate table (in other words, specifies the reduction rate) indicated by the table designation signal from the operation unit 2 (step S11), and the table designation signal. The reduction rate parameter included in the reduction rate table specified by is output to the pixel value update unit 60.

  Accordingly, the pixel value update unit 60 reduces the pixel value of at least the B component of the hue axis H in each pixel included in the image information Sin output from the color space conversion unit 61, which is output from the recording unit 5. The pixel value indicated by the rate table is updated (step S12), and the updated image information Sbc is output to the color space inverse transform unit 62.

  Then, the color space inverse conversion unit 62 performs the above-described reverse conversion processing from the HLS color space to the RGB color space on the updated image information Sbc output from the pixel value update unit 60, and the color space is changed to the RGB color space. The returned updated image information Sbc is output to the switching unit 7 (step S13).

  Thereafter, the switching unit 7 switches between the blue light reduction control unit 3 or the correction target range setting unit 4 side and the color space inverse conversion unit 62 side based on the on / off signal and the range designation signal from the operation unit 2. The display information Sout is output and displayed on the display 8 (step S6).

  As described above, according to the reduction processing according to the second embodiment, the luminance reduction rate corresponding to the B component in the HLS color space has each luminance corresponding to each color component other than the B component in the hue axis H. The updated image information Sbc is generated and displayed by reducing the luminance corresponding to the B component so as to be equal to or greater than the reduction rate of. Therefore, harmful B components can be reduced without separately using an optical member or the like that reduces the B components.

  Further, as illustrated in FIG. 9A, when the image corresponding to the image information Sin is achromatic, only on the luminance axis L (in other words, the saturation on the saturation axis S is set to zero). If the updated image information Sbc is generated by reducing the luminance, it is possible to effectively protect the eyes even for an achromatic color such as a white image. Furthermore, even when the saturation in the image corresponding to the image information Sin is, for example, 10% or less, the reduction ratios of the luminance corresponding to the B component in the hue and the color components other than the B component in the hue are all omitted. If the updated image information Sbc is generated as the same, all the color components in the hue are reduced approximately equally, so that, for example, the B component can be reduced while preventing the white color on the display from changing, which is harmful. B component can be reduced without change in color.

  Furthermore, as illustrated in FIG. 9B, when the display image information is generated by reducing only the luminance corresponding to the B component in the hue, the color tone of the color including white on the display changes. It is possible to reduce the harmful B component while preventing this.

  The reduction process according to the second embodiment described above has been described for the case where the HLS color space is used as the color space. However, even when the HSV color space described with reference to FIGS. The reduction process according to the second embodiment can be executed. In this case, the color space conversion unit 61 converts the image information Sin from the RGB color space to the HSV color space, and the color space inverse conversion unit 62 converts the update image information Sbc from the HSV color space to the RGB color space. Inverse conversion processing is performed. Further, the update of the pixel value in this case is an update of the pixel value based on the principle illustrated in FIG. Note that the conversion process itself from the RGB color space to the HSV color space in the color space conversion unit 60 and the reverse conversion process from the HSV color space to the RGB color space in the color space inverse conversion unit 62 are the conventional conversion processes. And the same inverse transformation process. As described above, in the reduction processing according to the second embodiment, the color space of the image information Sin is converted into either the HLS color space or the HSV color space and the reduction processing is executed. The harmful B component can be reduced while preventing the color tone from changing. The present invention is also applicable to a so-called La * b * color space, which is a similar color space, and a so-called YCbCr (YUV) color space consisting of luminance and color difference.

  Furthermore, the reduction process is performed using the reduction rate table selected by operating the operation unit 2 out of the reduction rate tables recorded in the recording unit 5, and the range to be subjected to the reduction process according to the second embodiment. Can be selected, the same effects as the reduction process according to the first embodiment can be obtained, respectively, and the same application as the reduction process according to the first embodiment is possible.

  Furthermore, the reduction process according to the second embodiment can have other modes than those described above.

  For example, in the second embodiment described above, a case has been described in which the reduction rate for the B component of the hue axis H is changed linearly as illustrated with reference to FIG. 12, but other than this, for example, FIG. As illustrated in a), the reduction rate can be increased as the luminance in the input image information Sin increases. In this case, if the reduction process illustrated in FIG. 14A is expressed in the HLS color space, the reduction rate changes unevenly as illustrated in FIG. 14B, for example. Such a reduction process can be realized by changing the content of the reduction rate parameter included in the reduction rate table according to the second embodiment.

  Further, when the average luminance in the entire image to be displayed is detected by, for example, the blue light reduction control unit 3 and the detected average luminance is, for example, experimentally or empirically set in advance, the first embodiment. It is also possible to perform a reduction process according to the second embodiment or a reduction process according to the second embodiment. In this case, since the reduction process is performed when the average luminance in the entire image is equal to or higher than the predetermined luminance, harmful blue light can be reduced without impairing the color or impression of the entire image. Note that the luminance at this time may be detected by separately providing an illuminance sensor for detecting the illuminance on the surface of the display 8, for example.

  Furthermore, in the first embodiment or the second embodiment described above, the range in the image is designated to control whether or not the reduction process according to the first embodiment or the reduction process according to the second embodiment is a target. However, the range specifying process may be omitted, and the reduction process according to the first embodiment or the reduction process according to the second embodiment may be performed uniformly on the entire image. Furthermore, instead of recording in advance like the reduction rate table according to each embodiment, the reduction rate itself can be configured to be finely specified by the user each time.

Furthermore, in the first embodiment or the second embodiment described above, blue light is reduced by controlling, for example, the luminance reduction rate corresponding to the color component. The present invention can also be applied to a case where blue light is reduced by controlling the reduction amount itself. More specifically in this case, for example,
Reduction rate [%] = (reduction amount / input pixel value) × 100
The present invention can be similarly applied by controlling the amount of reduction so as to satisfy the following relationship.

  Also, a program corresponding to the flowchart shown in FIG. 4 or FIG. 13 is recorded on a recording medium such as an optical disk, or acquired and recorded via a network such as the Internet, and these are recorded, for example, as a general-purpose microcomputer or the like Are read out and executed by the blue light reduction control unit 3, the correction target range setting unit 4, and the pixel value update unit 6 (pixel value update unit 60) according to the first or second embodiment. It is also possible to function as the switching unit 7.

  Next, experimental results and the like that verify the effect of the reduction process according to the first embodiment among the above-described embodiments will be described with reference to FIGS. 15 to 17. 15 to 17 are diagrams illustrating the effect. In addition, the experimental results and the like described below can be similarly applied to the reduction processing according to the second embodiment.

  First, an outline of an experiment performed to confirm the effect of the reduction process according to the first embodiment will be described. In the experiment for explaining the result below, when both the optical filter corresponding to the optical component explained in the background art and the present invention are not used (hereinafter “original picture” in FIGS. 15 to 17), only the optical filter is used. When blue light is reduced by using (hereinafter, “optical filter” in FIGS. 15 to 17), and when blue light is reduced without using an optical filter by applying the present invention (hereinafter, FIG. 15) Through FIG. 17, for each of the “present invention”), white is displayed as an image (for example, the brightness value of each color is “255, 255, 255” in a color space of RGB 24 bits (each 8 bits)). The energy irradiated from the display 8 was observed with a spectral radiance meter. 15 to 17, the horizontal axis is the wavelength, and the vertical axis is the normalized value of the measured radiance value. 15 to 17, (a) shows all wavelengths, and (b) shows an enlarged view of the B component.

  First, as illustrated in FIG. 15, when the reduction rate is relatively small, as shown in FIGS. 15A and 15B, the reduction process according to the first embodiment is the same as the optical filter. The blue light reduction effect is realized.

  On the other hand, as illustrated in FIG. 16, when the reduction rate is relatively large, as shown in FIGS. 16 (a) and 16 (b), although the measurement results show some deviation, the deviation is observed. In itself, it is not large, and can be sufficiently relaxed by optimizing the parameters at the time of color adjustment.

  15 and 16 show the results, respectively, and even when an optical filter having different characteristics is used, the same blue light as the optical filter can be obtained by changing the reduction rate parameter according to the first embodiment. Can be reduced. In other words, the reduction rate can be arbitrarily controlled by the user by adjusting the reduction rate parameter.

  Finally, as illustrated in FIG. 17, an experiment was performed using four types of reduction rate parameters (first reduction rate to fourth reduction rate). In addition, about each reduction rate parameter, the thing similar to what was illustrated in FIG. 3 was used. As is apparent from FIG. 17, an arbitrary blue light reduction rate can be realized by changing the reduction rate parameter as color adjustment. That is, since the reduction rate can be controlled arbitrarily by the user, it is possible to respond to a request for a reduction rate that differs depending on the situation or individual.

  As described above, the present invention can be used in the field of display devices, and has a particularly remarkable effect when applied to the field of display device control for the purpose of protecting the eyes of users. can get.

DESCRIPTION OF SYMBOLS 1 Image generation part 2 Operation part 3 Blue light reduction control part 4 Correction object range setting part 5 Recording part 6, 60 Pixel value update part 61 Color space conversion part 62 Color space reverse conversion part 7 Switching part 8 Display D1, D2 Display apparatus AR range Sin image information Sop operation signal Sbc updated image information Sout display information T1, TT1 first reduction rate table T2, TT2 second reduction rate table T3, TT3 third reduction rate table Tn, TTn nth reduction rate table

Claims (14)

Obtaining means for obtaining image information corresponding to an image to be displayed on the display means;
The display image information is displayed by reducing each luminance so that the luminance reduction rate corresponding to the blue component in the acquired image information is equal to or higher than the luminance reduction rate corresponding to the other color components in the image information. Processing means for performing brightness control processing to be generated and output and displayed on the display means;
An image processing apparatus comprising: The image processing apparatus according to claim 1.
The blue component is a B component in an RGB (Red Green Blue) color space, and the other color components are an R component and a G component in the RGB color space,
The processing means includes the luminance corresponding to the B component such that the reduction rate of the luminance corresponding to the B component is greater than the reduction rate of the luminance corresponding to the R component and the G component, respectively. The image processing apparatus is characterized in that the image information for display is reduced and output to the display means for display. The image processing apparatus according to claim 2,
As the luminance control process, the processing unit increases the luminance reduction rate corresponding to the B component as the B component in the pixels constituting the image is larger than the R component and the G component in the pixel. Generating the display image information. The image processing apparatus according to claim 2 or 3,
As the luminance control process, the processing means sets the luminance reduction rate corresponding to each of the R component and the G component to be one quarter or more and one half or less of the luminance reduction rate corresponding to the B component. An image processing apparatus for generating the display image information. The image processing apparatus according to claim 1.
The blue component is a B component in the hue in a color space composed of three elements including hue and saturation, and the other color component is a color component other than the B component in the hue,
The processing means is configured so that the reduction rate of the luminance corresponding to the B component is equal to or higher than the reduction rate of the luminances corresponding to the color components other than the B component in the hue. The image processing apparatus is characterized in that the display image information is generated by reducing the luminance corresponding to the above, and is output and displayed on the display means. The image processing apparatus according to claim 5.
As the luminance control process, the processing means sets the image information for display with the same reduction ratios of the luminances corresponding to the B component in the hue and the color components other than the B component in the hue. Generating an image processing apparatus. The image processing apparatus according to claim 5.
When the image corresponding to the acquired image information is an achromatic color, as the luminance control process, the processing means reduces the elements other than the hue and the saturation in the color space and reduces the display image information. An image processing apparatus that generates the image processing apparatus. In the image processing device according to any one of claims 5 to 7,
The image processing apparatus, wherein the color space is one of an HLS (Hue, Luminance, Saturation) color space or an HSV (Hue, Saturation, Value) color space. In the image processing device according to any one of claims 1 to 8,
Detecting means for detecting an average luminance in the entire image to be displayed;
The image processing apparatus, wherein the processing means performs the brightness control process when the detected average brightness is equal to or higher than a preset brightness. In the image processing device according to any one of claims 2 to 8,
The processing means includes
Storage means for preliminarily storing luminance information indicating at least a reduction rate of the luminance corresponding to the B component corresponding to the luminance control processing;
Selection means used to select the stored luminance information;
With
The image processing apparatus, wherein the processing means performs the brightness control process using the selected brightness information. The image processing apparatus according to any one of claims 1 to 10,
An area selection unit used for selecting a part of a display area of the display unit on which the image is displayed;
The image processing apparatus, wherein the processing means performs the brightness control process only on the selected part. An image processing apparatus according to any one of claims 1 to 11,
The display means for acquiring the display image information and displaying an image corresponding to the display image information;
A display device comprising: An acquisition step of acquiring image information corresponding to an image to be displayed on the display means;
The display image information is displayed by reducing each luminance so that the luminance reduction rate corresponding to the blue component in the acquired image information is equal to or higher than the luminance reduction rate corresponding to the other color components in the image information. Generating, outputting and displaying on the display means;
An image processing method comprising: A computer included in the image processing apparatus;
Obtaining means for obtaining image information corresponding to an image to be displayed on the display means; and
Display image information is generated by reducing each luminance so that the luminance reduction rate corresponding to the blue component in the acquired image information is equal to or higher than the luminance reduction rate corresponding to the other components in the image information. And processing means for outputting and displaying on the display means,
An image processing program that is made to function as: