Display control device, program, and display control method

Abstract

To suppress deterioration in image visibility and adjust the brightness of a text window section.SOLUTION: A control section 20 to which an image signal is externally supplied comprises: a display control section 25 that receives the supplied image signal and controls to display a screen image on a display section 11; a comparison section 23 that compares a peak level of an image signal of a text window section displayed on the display section 11 with a peak level of an image signal of an image displayed on the display section 11; and a luminance control section 24 that, according to comparison results from the comparison section 23, controls to adjust gain in a direction which decreases the peak level across the entire screen image when the peak level of the image signal of the image is greater than the peak level of the image signal of the text window section.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a display control device, a program, and a display control method.

Background Art

[0002] Regarding a display device that inputs RGB luminance signals and displays a color image on a display unit, a technique for optimally correcting the color temperature of white according to the area of white in the image is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, in a display device such as a fluoroscopic imaging device, when displaying an image with many dark portions such as a fluoroscopic image, a bright window such as a text window may be opened. In this case, the level of the displayed luminance becomes extremely high, and it may be dazzling and difficult to directly view with the naked eye. The technique shown in Patent Document 1 is a technique for optimizing the color temperature of white regardless of whether it is a small area or a large area, and is not a technique that takes into account the glare of the user who is directly viewing. Further, when a bright text window is opened, if the overall luminance of the display unit is lowered, the visibility of the image may be reduced.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a display control device, a program, and a display control method capable of suppressing a decrease in image visibility and adjusting the brightness of a text window portion.

Means for Solving the Problems

[0006] In order to solve the above-described problems and achieve the object, a display control device according to the present invention is a display control device to which an image signal is supplied from the outside, and includes a display control unit that controls to display a screen image on a display unit in response to the supplied image signal, a comparison unit that compares a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image displayed on the display unit, and a luminance control unit that controls to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image is greater than the peak level of the image signal of the text window unit according to a comparison result of the comparison unit.

[0007] A program according to the present invention is executed by a computer operating as a display control device, and includes a display control step of controlling to display a screen image on a display unit in response to a supplied image signal, a comparison step of comparing a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image displayed on the display unit, and a luminance control step of controlling to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image is greater than the peak level of the image signal of the text window unit according to a comparison result of the comparison step.

[0008] An image reading control method according to the present invention includes a display control step of controlling to display a screen image on a display unit in response to a supplied image signal, a comparison step of comparing a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image displayed on the display unit, and a luminance control step of controlling to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image is greater than the peak level of the image signal of the text window unit according to a comparison result of the comparison step.

Effect of the Invention

[0009] According to the present invention, it is possible to suppress a decrease in visibility of an image and adjust the brightness of a text window unit.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of a display control device, a program, and a display control method according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments.

[0012] [First Embodiment] (Display Device) FIG. 1 is a block diagram showing a configuration example of a display device 10 having a control unit 20 according to the first embodiment. The display device 10 is a device that displays a screen image including an image and a text window image of a text window section. The display device 10 displays while suppressing the brightness of the text window section without changing the brightness of the image. The display device 10 is, for example, a device that reads a radiographic image such as an X-ray or a mammogram, which is an image. The display device 10 may be, for example, a display device that displays an image such as a natural picture. In the present embodiment, a case where the display device 10 is a reading device and the image is a radiographic image will be described as an example.

[0013] The text window section is input via an external computer of the display device 10. The text window section is a text window displayed on the display device 10 by an image signal of a text window image output from an external computer.

[0014] An image signal for displaying a screen image is supplied to the display device 10 from the outside. For example, an image signal is input to the display device 10 from an external computer connected by wire or wirelessly. The display device 10 performs display based on the image signal input from the outside.

[0015] The text window section is a window in which text is displayed on a white background or a substantially white background. In this case, since it is grayscale, it becomes achromatic. When displaying achromatic colors in 8-bit gradations, there are 256 gradations from 0 to 255. A window in which all pixels are displayed at the maximum gradation of 255 levels is called a white background window. The display at this 255 level is called the white level. Substantially white means, for example, having a region composed of pixels with a level less than 255, such as 254, as the background. The white level of the text window section may be a level not included in the radiographic image. The text window section is a window that is brighter than the radiographic image displayed on the same screen of the display unit 11. The text window section can be displayed on the display unit 11 side by side with the radiographic image or with a part overlapping the radiographic image.

[0016] The display device 10 includes a display unit 11 and a control unit (display control device) 20.

[0017] The display unit 11 is a device that displays various types of information. The display unit 11 is, for example, a display including a liquid crystal display (LCD) or an organic EL (Electro-Luminescence) display. The display unit 11 displays a screen image based on an image signal input to the display device 10 from the outside. The display unit 11 displays a screen image based on the image signal output via the display control unit 25 of the control unit 20. In the present embodiment, the display unit 11 displays a radiographic image and a text window section. The display unit 11 displays the text window section with its brightness suppressed without changing the brightness of the radiographic image.

[0018] The control unit 20 is, for example, an arithmetic processing device (control device) configured by a CPU (Central Processing Unit) or the like. The control unit 20 loads a stored program into a memory and executes instructions included in the program. The control unit 20 includes an internal memory (not shown), and the internal memory is used for temporarily storing data in the control unit 20. The control unit 20 controls to display the text window section with its brightness suppressed without changing the brightness of the radiographic image. The control unit 20 includes an image signal acquisition unit 29, a detection unit 21, an analysis unit 22, a comparison unit 23, a luminance control unit 24, and a display control unit 25.

[0019] The image signal acquisition unit 29 acquires an image signal of a screen image to be displayed on the display unit 11 from outside the display device 10.

[0020] The detection unit 21 detects the text window section displayed on the display unit 11. More specifically, the detection unit 21 detects pixels corresponding to the text window section from the image signal of the screen image output to the display unit 11. In the present embodiment, the detection unit 21 detects pixels with a white level of 100% as the pixels corresponding to the text window section from the image signal of the screen image. As described above, since the read shadow image does not include pixels with a white level of 100%, the pixels with a white level of 100% included in the screen image are those of the text window image of the text window section. For example, when the image signal is an 8-bit gradation, the detection unit 21 detects pixels with a level of 255, which is the white level of 100%. The detection unit 21 may include pixels close to white as detection targets. For example, the detection unit 21 may also detect pixels with a level less than 255, such as 254. For example, when a plurality of pixels detected in this way form a region with a predetermined area or more, the detection unit 21 detects it as the text window section.

[0021] The analysis unit 22 analyzes the peak level of the image displayed on the display unit 11. The analysis unit 22 analyzes the peak level of the image signal of the image output to the display unit 11. For example, the analysis unit 22 may analyze the peak level excluding the portions with a high black level and the portions with a high white level in the image signal of the image. A known method can be used for analyzing the peak level, and it is not limited.

[0022] In the analysis unit 22, when calculating the peak level from the histogram of the screen image including the text window section, the signal level corresponding to the text window section is included in the histogram. As a result, the accuracy of detecting the peak level may decrease. Therefore, it is preferable to exclude and detect the signal level corresponding to the text window section.

[0023] In the analysis unit 22, the peak level of the image may be calculated in consideration of the histogram immediately before opening the text window section.

[0024] The comparison unit 23 compares the level of the text window portion displayed on the display unit 11 with the peak level of the image displayed on the display unit 11. In the present embodiment, the comparison unit 23 compares the clip level of the text window portion displayed on the display unit 11 with the peak level of the image displayed on the display unit 11. More specifically, based on the analysis result of the analysis unit 22, the comparison unit 23 determines whether the clip level of the text window portion displayed on the display unit 11 is equal to or higher than the peak level of the image displayed on the display unit 11.

[0025] The text window portion includes not only 100% white but also those with a level of a text window portion having a bright gray background other than 100% white that is not clipped.

[0026] When the peak level of the image is greater than the level of the text window portion according to the comparison result of the comparison unit 23, the luminance control unit 24 controls to adjust the gain in a direction to lower the peak level of the entire image. In the present embodiment, when the peak level of the image is greater than the clip level of the text window portion according to the comparison result of the comparison unit 23, the luminance control unit 24 controls to adjust the gain in a direction to lower the peak level of the entire image.

[0027] When the level of the text window portion is equal to or higher than the peak level of the image according to the comparison result of the comparison unit 23, the luminance control unit 24 controls to clip the clip level of the text window portion to near the peak level of the image. In the present embodiment, when the clip level of the text window portion is equal to or higher than the peak level of the image according to the comparison result of the comparison unit 23, the luminance control unit 24 controls to clip the clip level of the text window portion to near the peak level of the image.

[0028] The predetermined value of the gain is, for example, 1.

[0029] In this embodiment, when the clip level of the text window section is equal to or higher than the peak level of the image, the luminance control unit 24 reduces the clip level of the image signal of the text window section. The luminance control unit 24 does not change the clip level of the image signals other than the text window section.

[0030] In this way, the luminance control unit 24 adjusts the brightness of the pixels in the text window section on the display unit 11.

[0031] The display control unit 25 controls the display unit 11 to display the image and the text window section. The display control unit 25 performs the display based on the image signal in which the clip level of the signal intensity for displaying the maximum gradation among the image signals is reduced by the luminance control unit 24. Thereby, the display control unit 25 performs the display while keeping the brightness of the image as it is and suppressing the brightness of the text window section.

[0032] (Processing in the display device) Next, with reference to FIG. 2, the processing in the display device 10 will be described. FIG. 2 is a flowchart showing an example of the processing in the control unit 20 according to the first embodiment. While the display device 10 is activated and the process of displaying the screen image on the display unit 11 is being performed, the process of the flowchart shown in FIG. 2 is performed.

[0033] The control unit 20 detects the text window section (step S101). More specifically, the control unit 20 detects, by the detection unit 21, the pixels corresponding to the text window section from the image signal output to the display unit 11. The control unit 20 detects, by the detection unit 21, the pixels with 100% white level from the screen image displayed on the display unit 11 as the pixels corresponding to the text window section. When the plurality of detected pixels with 100% white level form a region with a predetermined area or more, the control unit 20 detects it as the text window section. The control unit 20 proceeds to step S102.

[0034] The control unit 20 calculates the peak level of the image (step S102). More specifically, the control unit 20 analyzes the peak level of the image displayed on the display unit 11 by the analysis unit 22. The control unit 20 may analyze the peak level by the analysis unit 22, for example, excluding portions with a high black level and portions with a high white level in the image signal. The control unit 20 proceeds to step S103.

[0035] The control unit 20 determines whether the clip level of the text window unit is equal to or higher than the peak level of the image (step S103). More specifically, the control unit 20 determines by the comparison unit 23 whether the clip level of the text window unit displayed on the display unit 11 is equal to or higher than the peak level of the image displayed on the display unit 11. When the control unit 20 determines that the clip level of the text window unit is equal to or higher than the peak level of the image (Yes in step S103), it proceeds to step S104. When the control unit 20 does not determine that the clip level of the text window unit is equal to or higher than the peak level of the image (No in step S103), it proceeds to step S105.

[0036] When it is determined that the clip level of the text window unit is equal to or higher than the peak level of the image (Yes in step S103), the control unit 20 adjusts the luminance (step S104). More specifically, the control unit 20 reduces the clip level of the image signal at 100% white level to near the peak level of the image by the luminance control unit 24. The control unit 20 proceeds to step S106.

[0037] When it is not determined that the clip level of the text window unit is equal to or higher than the peak level of the image (No in step S103), the control unit 20 applies a gain of 1 or less (step S105). More specifically, the control unit 20 applies a gain of 1 or less to the entire screen by the luminance control unit 24. The control unit 20 proceeds to step S106.

[0038] The control unit 20 determines whether to end the process (step S106). More specifically, the control unit 20 determines to end the process, for example, when an operation to end the process of displaying the screen image is performed, when an operation to change the displayed image is performed, or when the power of the display device 10 is turned off. If the control unit 20 determines to end the process (Yes in step S106), it ends the process. If the control unit 20 does not determine to end the process (No in step S106), it executes the process of step S101 again.

[0039] FIG. 3 is a diagram for explaining an example of the display of the display unit 11. FIG. 4 is a diagram showing a histogram of the image shown in FIG. 3. FIG. 5 is a diagram showing the signal level and gain of the image in FIG. 3. In step S102, the peak level of the image is calculated from FIG. 4. In step S103, it is determined from FIGS. 4 and 5 whether the clip level of the text window part is equal to or higher than the peak level of the image. In the example shown in FIG. 3, it is assumed that the clip level B1 of the text window part 101 is determined to be equal to or higher than the peak level of the image (Yes in step S103). In this case, the clip level of the image signal remains at clip level B1.

[0040] FIG. 6 is a diagram for explaining an example of the display of the display unit 11. FIG. 7 is a diagram showing the signal level and gain of the image in FIG. 6. Note that the peak level of the fluoroscopic image included in the image is the same as that in FIG. 4. In step S103, it is determined from FIG. 7 whether the clip level of the text window part is equal to or higher than the peak level of the image. Here, it is assumed that the clip level B2 (B2 < B1) of the text window part 101 is determined to be equal to or higher than the peak level of the image (Yes in step S103). In this case, as shown in FIG. 7 from the state shown in FIG. 3, the brightness of the text window part 101 is lowered to the clip level B2, and the text window 101 and the fluoroscopic image are made the same darkness. The brightness of the text window part 101 shown in FIG. 6 is adjusted to be darker than the text window part 101 shown in FIG. 3.

[0041] FIG. 8 is a diagram for explaining an example of the display on the display unit 11. FIG. 9 is a diagram showing the signal level and gain of the image in FIG. 8. FIG. 10 is a diagram showing the histogram of the image shown in FIG. 8. Note that the clip level of the text window image included in the image is lower than that in FIG. 4. The value A of the signal level at which the slope in FIG. 9 changes is shown as the value A of the peak level of the histogram in FIG. 4. In step S103, it is determined from FIG. 10 whether or not the clip level of the text window portion is equal to or higher than the peak level of the image. Here, it is assumed that the clip level B3 (B3 < B2) of the text window portion 101 is determined to be less than the peak level of the image (No in step S103). In this case, a gain of 1 or less is applied to the image signal of the entire screen output to the display unit 11. As a result, the clip level of the image signal is the clip level B3, and the entire image becomes darker. In the example shown in FIG. 8, the entire screen including the image becomes darker than the example shown in FIG. 6.

[0042] (Effect) As described above, in the present embodiment, when the peak level of the image displayed on the display unit 11 is greater than the level of the image signal of the text window portion, it is possible to control so as to adjust the gain in the direction of lowering the peak level of the entire image. According to the present embodiment, when an image and a text window portion are displayed on the display unit 11, it is possible to suppress a decrease in the visibility of the image and adjust the brightness of the text window portion.

[0043] According to the present embodiment, when another window such as a text window portion with high brightness is opened during viewing of an image, it is possible to reduce the uncomfortable feeling due to glare. It is possible to suppress a decrease in the brightness of the image being viewed.

[0044] Each component of the illustrated display device is functionally conceptual and does not necessarily have to be physically configured as shown in the figure. That is, the specific form of each device is not limited to that shown in the figure, and all or part of it may be functionally or physically distributed or integrated in any unit according to the processing load of each device, the usage situation, and the like.

[0045] The configuration of the display device is realized, for example, as software by a program loaded into the memory or the like. In the above embodiment, it has been described as a functional block realized by the cooperation of these hardware or software. That is, these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

[0046] The components described above include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the configurations described above can be combined as appropriate. Also, various omissions, substitutions, or changes in the configuration are possible without departing from the gist of the present invention.

[0047] This disclosure includes matters that contribute to the realization of "Health and Well-being for All" of the SDGs (Sustainable Development Goals) and contribute to value creation by healthcare products and services.

Explanation of Reference Numerals

[0048] 10 Display device 11 Display unit 20 Control unit (display control device) 21 Detection unit 22 Analysis unit 23 Comparison unit 24 Luminance control unit 25 Display control unit

Claims

1. A display control device to which an image signal is supplied from the outside, comprising: a display control unit that controls to display a screen image on a display unit in response to the supplied image signal; a comparison unit that compares a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image of an image unit displayed on the display unit; a luminance control unit that controls to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image of the image unit is greater than the peak level of the image signal of the text window unit according to the comparison result of the comparison unit; A display control device comprising the above.

2. The image displayed on the image unit is a fluoroscopic image, The display control device according to claim 1.

3. When the peak level of the image signal of the text window unit is equal to or higher than the peak level of the image signal of the screen image of the image unit, the luminance control unit controls a clip level of a signal intensity that displays a maximum gradation among the image signals output from the display control unit to the display unit according to the comparison result of the comparison unit. The display control device according to claim 1.

4. A display control step of controlling to display a screen image on a display unit in response to a supplied image signal; a comparison step of comparing a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image of an image unit displayed on the display unit; a luminance control step of controlling to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image of the image unit is greater than the peak level of the image signal of the text window unit according to the comparison result of the comparison step; A program executed by a computer operating as a display control device.

5. A display control step of controlling to display a screen image on a display unit in response to a supplied image signal; a comparison step of comparing a peak level of an image signal of a text window unit displayed on the display unit with a peak level of an image signal of an image of an image unit displayed on the display unit; a luminance control step of controlling to adjust a gain in a direction of lowering the peak level of the entire screen image when the peak level of the image signal of the image of the image unit is greater than the peak level of the image signal of the text window unit according to the comparison result of the comparison step; A display control method including the above.

Images