WO2006103862A1 - 画像表示装置及び画像表示方法 - Google Patents
画像表示装置及び画像表示方法 Download PDFInfo
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- WO2006103862A1 WO2006103862A1 PCT/JP2006/303802 JP2006303802W WO2006103862A1 WO 2006103862 A1 WO2006103862 A1 WO 2006103862A1 JP 2006303802 W JP2006303802 W JP 2006303802W WO 2006103862 A1 WO2006103862 A1 WO 2006103862A1
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- luminance
- brightness
- image display
- correction
- image
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- 238000000034 method Methods 0.000 title claims description 34
- 238000012937 correction Methods 0.000 claims abstract description 135
- 238000001514 detection method Methods 0.000 description 37
- 238000010586 diagram Methods 0.000 description 14
- 238000012545 processing Methods 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
- H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/58—Control of contrast or brightness in dependence upon ambient light
Definitions
- the present invention relates to an image display device and an image display method, and more particularly to a technique for correcting gradation so as to improve visibility by eliminating the influence of external light.
- the histogram conversion method is a technique for correcting the gradation of an image, but it is useful for improving the contrast of an image projected by a projector device, and further improvements are being made in view of the characteristics of the projector device field. ing.
- the histogram conversion that was originally performed for all luminance ranges is a level corresponding to the difference between the maximum value and the minimum value for the range up to the minimum value force maximum value during the effective image period of the image luminance signal. This is performed using a key correction coefficient.
- FIG. 1 is a functional block diagram showing a configuration of an image processing apparatus according to the related art.
- the image processing apparatus 20 includes a minimum value detection circuit 2001, a maximum value detection circuit 2002, a differentiator 2003, a correction coefficient calculation circuit 2004, and a correction circuit 2005.
- the image processing device 20 receives the input video luminance signal, the minimum value during the effective video period is detected by the minimum value detection circuit 2001 and the maximum value is detected by the maximum value detection circuit 2002. Then, the difference between the maximum value and the minimum value is obtained by the differentiator 2003, and the correction coefficient calculation circuit 2004 determines the correction coefficient according to the difference.
- the correction circuit 2005 corrects the input video luminance signal and outputs it as an output video luminance signal. This further improves the contrast of the image.
- Patent Document 1 Japanese Patent No. 3549356
- the present invention has been made in view of the above-described problems, and is easy to see regardless of changes in the visual environment! /
- An object of the present invention is to provide an image display device and an image display method for displaying an image.
- an image display device is an image display device that displays a multi-tone image, and is a photometric means for detecting the intensity of external light (eg, FIG. 2). External light detector 304.) and correction means (for example, the luminance level adjustment circuit 303 in FIG. 2) that corrects the gradation so that the luminance is distributed within a narrow luminance range as the external light is stronger.
- the luminance range includes the highest luminance (for example, the offset level adjustment circuit 305 in FIG. 4).
- the luminance is increased according to the intensity of external light, so that an image can be easily displayed regardless of changes in the viewing environment.
- the correction means performs gradation correction that increases the correction coefficient as the luminance distribution is larger in the luminance range (for example, the coefficient calculation circuit 302 in FIG. 4).
- the correction means performs gradation correction that increases the correction coefficient as the luminance distribution is larger in the luminance range (for example, the coefficient calculation circuit 302 in FIG. 4).
- the image display device includes means for detecting the luminance or hue of a flesh-colored pixel (for example, the flesh-color detection circuit 806 in FIG. 9), and the correcting means has a luminance for the flesh-colored pixel. It is characterized by not adjusting. In this way, the luminance is not corrected for the flesh-colored part! Therefore, it is possible to display a natural image while suppressing the change in color tone.
- the correcting means increases the brightness as the brightness and hue of each pixel is closer to the skin color. It is more preferable to adjust so that the change in the degree is small. Further, the correction means may not adjust the brightness of the flesh color pixels when there are flesh color pixels around the flesh color pixels.
- the image display apparatus has an average luminance M over all pixels constituting the image.
- this difference is Predetermined
- Means for changing the value of the correction coefficient so as to be equal to or less than the value for example, the luminance level adjustment circuit 1103 in FIG. 11. In this way, large fluctuations in average luminance can be suppressed, so that a natural image can be displayed while suppressing excessive changes in gradation.
- the image display device is a means for lowering the luminance within the predetermined range when the luminance within the predetermined luminance range including the lowest luminance after adjustment by the correcting unit is higher than the predetermined luminance.
- a black level correction circuit 1706 in FIG. 17 is provided. In this way, it is possible to prevent the low-brightness part from floating brightly and display a tightened image.
- the image display device is a means for obtaining the maximum value and the minimum value of the luminance over all the pixels constituting the image (for example, the maximum value detection circuit 1406 and the minimum value detection circuit 1407 in FIG. 14). )) And means for distributing the luminance frequency distributed in the range from the minimum value to the maximum value in proportion to the range from 0 to the maximum number of gradations (for example, luminance distribution detection). Circuit 1401.), and the correction means adjusts the luminance of the proportionally distributed luminance distribution. In this way, it is possible to enhance visibility by enhancing the contrast of the image.
- An image display method is an image display method executed by an image display device that displays a multi-tone image, and is a photometric step for detecting the intensity of external light (for example, FIG. S60 4.) and a correction step (for example, S606 in FIG. 7) for correcting the gradation so that the luminance is distributed within a narrow luminance range as the outside light is strong, and the luminance range is the highest It is characterized by including brightness (eg S607 in Fig. 7). In this way, since the luminance is increased according to the intensity of external light, an easy-to-view image can be displayed regardless of changes in the viewing environment.
- the luminance distribution is within the luminance range. It is characterized by gradation correction that increases the correction coefficient as the number increases (for example, S603 in Fig. 7). In this way, it is possible to improve visibility by suppressing a decrease in contrast caused by increasing the lower limit of luminance.
- the image display method includes a step (for example, S902 in FIG. 10) of detecting the luminance or hue of a flesh-colored pixel, and the correction step does not adjust the luminance for the flesh-colored pixel. To do. In this way, since the brightness is not corrected for the flesh-colored portion, a natural image can be displayed while suppressing the change in color tone.
- the correction step is adjusted so that the change in luminance becomes smaller as the luminance and hue of each pixel are closer to skin color. Further, the correction step may not adjust the brightness of the skin color pixel when there is a skin color pixel around the skin color pixel.
- the image display method according to the present invention includes an average luminance M over all pixels constituting an image.
- the difference between the average luminance M after adjustment in the step of obtaining 0 (for example, S1202 in FIG. 12) and the average luminance M after adjustment in the correction step exceeds a predetermined value, the difference becomes less than the predetermined value.
- the image display method according to the present invention is a step of reducing the luminance in the range when the luminance in the predetermined range including the lowest luminance is higher than the predetermined luminance after the adjustment in the correction step. (For example, S 1807 in FIG. 18). In this way, it is possible to prevent the low brightness portion from being brightly lifted and display a tightened image.
- the image display method according to the present invention includes a step (for example, S1502 and S1503 in FIG. 15) of obtaining a maximum value and a minimum value of luminance over all pixels constituting an image, and the minimum value to the maximum value.
- FIG. 1 is a functional block diagram showing a configuration of an image processing apparatus according to a conventional technique.
- FIG. 2 is a diagram showing a usage pattern of the projector device according to the first embodiment of the present invention.
- FIG. 3 is an external view of projector device 1 according to the first embodiment of the present invention.
- FIG. 4 is a block diagram showing a main functional configuration of projector device 1 according to the first embodiment of the present invention.
- FIG. 5 is a graph illustrating a luminance distribution in an effective video period of a video luminance signal.
- FIG. 6 is a graph showing how the projector apparatus 1 according to the first embodiment of the present invention adjusts the correction coefficient.
- FIG. 7 is a flowchart showing tone correction processing executed by the projector device 1 according to the first embodiment of the present invention.
- FIG. 8 is a graph showing the correction coefficient of the gradation correction method according to the prior art and the correction coefficient of the gradation correction method according to the present embodiment.
- FIG. 9 is a block diagram showing a main configuration of a projector apparatus according to a second embodiment of the present invention.
- FIG. 10 is a flowchart showing the operation of the projector device 8 according to the second embodiment of the present invention.
- FIG. 11 is a block diagram showing a main configuration of a projector apparatus according to a third embodiment of the present invention.
- FIG. 12 is a flowchart showing the operation of the projector device 11 according to the third embodiment of the present invention.
- FIG. 13 is a graph illustrating the manner in which the correction coefficient is adjusted by projector device 11 according to the third embodiment of the invention.
- FIG. 14 is a block diagram showing a main configuration of a projector apparatus according to a fourth embodiment of the present invention.
- FIG. 15 is a flowchart showing the operation of the projector device 14 according to the fourth embodiment of the present invention.
- the correction coefficient is adjusted by the projector device 14 according to the fourth embodiment of the present invention. It is a graph which shows a mode that it is arranged.
- FIG. 17 is a block diagram showing the main configuration of the projector apparatus according to the fifth embodiment of the present invention.
- FIG. 18 is a flowchart showing the operation of the projector device 17 according to the fifth embodiment of the present invention.
- FIG. 2 is a diagram showing a usage form of the projector apparatus according to the present embodiment.
- the projector apparatus 1 receives a video luminance signal from a personal computer 101, processes the signal, develops it on a built-in liquid crystal panel, and projects it onto a screen 102.
- FIG. 3 is an external view of the projector device 1.
- the projector 1 includes a video input terminal 201, an S video input terminal 202, an RGBZYPbPr input terminal 203, a remote control light receiving unit 204, a lens 205, a direction key 206, a decision button 207, and an external light sensor 208.
- the video input terminal 201, the S video input terminal 202, and the RGBZYPbPr input terminal 203 are arranged on the side surface of the housing, and the remote control light receiving unit 204 and the lens 205 are arranged on the entire surface of the housing.
- the direction key 206, the enter button 207, and the outside light sensor 208 are arranged on the upper surface of the casing.
- the external light sensor 208 is a sensor that detects the brightness around the projector device 1.
- FIG. 4 is a block diagram showing a main functional configuration of projector apparatus 1.
- the projector apparatus 1 includes a luminance distribution detection circuit 301, a coefficient calculation circuit 302, a luminance level adjustment circuit 303, an external light detector 304, and an offset level adjustment circuit 305.
- the luminance distribution detection circuit 301 is a luminance in the effective video period of the input video luminance signal. Detect distribution.
- Fig. 5 is a graph illustrating the luminance distribution in the effective video period of the video luminance signal.
- Fig. 5 (a) shows the luminance distribution in the effective video period of the video luminance signal, and
- Fig. 5 (b) shows the gain.
- the luminance distribution detected by the luminance distribution detection circuit 301 when a video luminance signal having a luminance distribution is input is shown.
- the luminance distribution detection circuit 301 receives a video luminance signal having a luminance distribution of 8 bits: 256 gradations.
- the luminance distribution is divided into four levels from 0 to 63, 64 to 127, 128 to 191 and 192 to 255 (Fig. 5 (b)).
- P is the number of all pixels in the image
- the correction coefficient C is calculated using the luminance distribution.
- the correction factor C represents the slope of each part of the graph shown in Fig. 6 (a)! /
- the external light detector 304 detects the brightness around the projector device 1 using the external light sensor 208 described above, and inputs a brightness signal indicating the detected brightness to the brightness level adjustment circuit 303.
- the brightness level adjustment circuit 303 adjusts the correction coefficient C received from the coefficient calculation circuit 302 based on the brightness signal received from the outside light detector 304. That is, the brightness level The adjustment circuit 303 adjusts the correction coefficient C by the following formula using the correction coefficient Q indicated by the brightness signal.
- the corrected luminance is obtained by the following equation.
- D is the brightness after correction. This is the pixel with the lowest input luminance.
- the offset level adjustment circuit 305 adjusts the luminance of each pixel belonging to the effective video period of the video luminance signal using the correction coefficient C ′ obtained by the luminance level adjustment circuit 303.
- FIG. 7 is a flowchart showing the tone correction processing executed by the projector device 1.
- the luminance distribution detection circuit 301 detects the luminance distribution in the effective video period of the video luminance signal (S602), and the coefficient calculation circuit At 302, the correction coefficient C for each of the four levels of luminance distribution is calculated (S603).
- the projector device 1 generates a brightness signal indicating the ambient brightness by the external light detector 304 (S604), and the brightness level adjustment circuit 303 corrects the brightness signal using the brightness signal.
- the coefficient C force correction coefficient C ′ is obtained (S605), and the gradation of the image is corrected (S606).
- the projector device 1 adjusts the offset level by the offset level adjustment circuit 305 (S607).
- FIG. 8 is a graph showing the correction coefficient of the gradation correction method according to the prior art and the correction coefficient of the gradation correction method according to the present embodiment.
- the minimum luminance value is raised to Q according to the viewing environment, and the correction coefficient is proportionally distributed within the range from Q to 255. Therefore, the visibility of both the low-luminance part and the high-luminance part can be improved at the same time.
- the projector device according to the present embodiment has substantially the same configuration as the projector device according to the first embodiment, but differs in that skin color pixels in the image are detected and correction is prohibited. . Only the differences will be explained below.
- FIG. 9 is a block diagram showing the main configuration of the projector apparatus according to the present embodiment.
- the projector device 8 includes a luminance distribution detection circuit 801, coefficient calculation A circuit 802, a luminance level adjustment circuit 803, an external light detector 804, an offset level adjustment circuit 800, and a skin color detection circuit 806 are provided.
- the flesh color detection circuit 806 detects flesh color pixels during the effective video period of the video luminance signal and notifies the luminance level adjustment circuit 803 and the offset level adjustment circuit 805.
- the brightness level adjustment circuit 803 does not perform gradation correction for flesh-colored pixels, and the offset level adjustment circuit 805 does not adjust flesh-colored pixels!
- FIG. 10 is a flowchart showing the operation of the projector device 8.
- the skin color detection circuit 806 detects the skin color pixels (S902), and the brightness distribution detection circuit 801 shines.
- the degree distribution is detected (S903), and the correction coefficient C is calculated by the coefficient calculation circuit 802 (S904).
- the projector device 8 generates a brightness signal by the external light detector 804 (S905), and the brightness level adjustment circuit 803 obtains a correction coefficient C ′ using the brightness signal (S906). Then, correct the gradation of the image (S907). Finally, the projector device 8 adjusts the offset level by the offset level adjustment circuit 805 (S908).
- the tone of the flesh color portion may be corrected within a range that does not impair the color tone.
- the surrounding pixels are pixels other than the skin color and the luminance correction amount is large, the skin color part will be raised if the brightness of the skin color pixel is not changed at all. In such a case, the luminance of the skin color pixels may be corrected.
- the surrounding pixels are skin color
- the brightness of the skin color pixels may not be corrected. good. Changes in skin color are perceived sensitively in the skin area of a person, so whether the surrounding pixels are skin color or not is discriminated whether it is a person's skin area, and if the surrounding pixels are skin color, the brightness is not corrected. By doing so, it is possible to display a natural person image by avoiding color modulation of the person's skin.
- RGB Red 255, green 232, and blue 192.
- red 105, green 52, and blue 44 For black people, for example, red 105, green 52, and blue 44. However, brightness 0 is the darkest and 225 is the brightest.
- the projector device according to the present embodiment has substantially the same configuration as the projector device according to the first embodiment, but differs in that the average luminance of the image is detected and the correction coefficient is adjusted. do it! / Only the differences will be described below.
- FIG. 11 is a block diagram showing the main configuration of the projector apparatus according to the present embodiment.
- the projector device 11 includes a luminance distribution detection circuit 1101, a coefficient calculation circuit 1102, a luminance level adjustment circuit 1103, an external light detector 1104, an offset level adjustment circuit 1105, and an average luminance calculation circuit 1106. Yes.
- the average luminance calculation circuit 1106 calculates the average luminance of the video luminance signal during the effective video period and notifies the luminance level adjustment circuit 1103 of the average luminance.
- the luminance level adjustment circuit 1103 corrects based on the result of the average luminance calculation circuit 1106 so that the correction coefficient power ⁇ , gradation level, brightness, and gradation level obtained by the coefficient calculation circuit 1102 are not excessively overcorrected. Adjust the correction coefficient so that the value is less than or equal to the specified value.
- FIG. 12 is a flowchart showing the operation of the projector device 11. As shown in FIG. 12, when the projector device 11 receives the video luminance signal (S1201), The luminance calculation circuit 1106 calculates the average luminance (S1202), the luminance distribution detection circuit 1101 detects the luminance distribution (S1203), and the coefficient calculation circuit 1102 calculates the correction coefficient ⁇ (S 1204).
- the projector device 11 generates a brightness signal by the external light detector 1104 (S
- the luminance level adjustment circuit 1103 obtains the correction coefficient C ′ using the brightness signal. In this case, a correction coefficient is obtained so that an extreme overcorrection does not occur in an image whose frequency is biased (S 1206). Then, the gradation of the image is corrected (S 1207). Finally, the projector device 11 adjusts the offset level by the offset level adjustment circuit 1105 (S1208).
- the tone is simply corrected based on the histogram for an image in which the background is black and the black object is represented like a crow
- the foreground is overcorrected.
- the crow's brightness may be too bright.
- the average luminance of the image is detected in advance, and the gradation is corrected so as not to deviate significantly from the average luminance.
- FIG. 13 is a graph illustrating how the correction coefficient is adjusted by the projector device 11.
- the coefficient calculation circuit 1102 calculates a correction coefficient (FIG. 13 (a)).
- M is the average brightness obtained from the brightness distribution before correction. In contrast, when there is external light
- FIG. 14 is a block diagram showing the main configuration of the projector apparatus according to the present embodiment.
- the projector device 14 includes a luminance distribution detection circuit 1401, a coefficient calculation circuit 1402, a luminance level adjustment circuit 1403, an external light detector 1404, an offset level adjustment circuit 1405, a maximum value detection circuit 1406, and a minimum value.
- a detection circuit 1407 is provided.
- Maximum value detection circuit 1406 detects the maximum value of luminance during the effective video period of the video luminance signal.
- the minimum value detection circuit 1407 detects the minimum value. These maximum and minimum values are notified to the luminance distribution detection circuit 1401.
- the luminance distribution detection circuit 1401 generates a luminance distribution by proportionally distributing the luminance frequencies distributed in the range from the minimum value to the maximum value in the range from 0 to 255.
- FIG. 15 is a flowchart showing the operation of the projector device 14.
- the maximum value detection circuit 1406 calculates the maximum luminance value (S1502)
- the minimum value detection circuit 1407 The minimum luminance value is calculated (S1503).
- the luminance distribution detection circuit 1401 detects the luminance distribution (S1504)
- the coefficient calculation circuit 1402 calculates the correction coefficient C (S 1505).
- the projector device 14 generates a brightness signal by the external light detector 1404 (S1506), and the brightness level adjustment circuit 1403 adjusts the correction coefficient using the brightness signal.
- the correction coefficient C ′ is determined so that the luminance frequency distributed within the range up to the minimum value force and maximum value is proportionally distributed between 0 force and 255 (S1507), and the gradation of the image is adjusted. Correction is performed (S 1508).
- the projector device 14 adjusts the offset level by the offset level adjustment circuit 1405 (S 1509).
- FIG. 16 is a graph showing how the correction coefficient is adjusted by the projector device 14. As shown in FIG. 16, first, the input luminance within the range up to the minimum value and the maximum value of the luminance during the effective video period of the video luminance signal is higher than the minimum value. The correction coefficient is adjusted so that the gradation is corrected to the output luminance. Next, the correction coefficient is adjusted so that the maximum value of the input luminance is converted to 255. Like this For example, the contrast of the image can be further enhanced to improve the visibility.
- the projector device according to the present embodiment has substantially the same configuration as the projector device according to the first embodiment, but differs in that the black level of the image is further corrected after correcting the gradation. .
- FIG. 17 is a block diagram showing the main configuration of the projector apparatus according to the present embodiment.
- the projector device 17 includes a luminance distribution detection circuit 1701, a coefficient calculation circuit 1702, a luminance level adjustment circuit 1703, an external light detector 1704, an offset level adjustment circuit 1705, and a black level correction circuit 1706. Yes.
- the black level correction circuit 1706 reduces the luminance of the low luminance part.
- FIG. 18 is a flowchart showing the operation of the projector device 17. As shown in FIG. 18, when the projector device 17 receives the video luminance signal (S 1801), the luminance distribution detection circuit 1701 detects the luminance distribution (S 1802), and the coefficient calculation circuit 1702 corrects the correction coefficient C. Is calculated (S1803).
- the projector device 17 generates a brightness signal by the external light detector 1704 (S1804), obtains a correction coefficient C "by the brightness level adjustment circuit 1703 (S1805), and corrects the gradation of the image. Then, the projector device 17 adjusts the offset level by the offset level adjustment circuit 1705 (S 1807). Finally, the projector device 17 adjusts the luminance of the low-brightness portion by the black level correction circuit 1706. Reduce (S1808).
- FIG. 19 is a graph showing how the black level correction circuit 1706 reduces the luminance of the low luminance part. As shown in FIG. 19, the black level correction circuit 1706 adjusts the output brightness Q corresponding to the input brightness 0 to the output brightness Q.
- the projector device has been described as an example.
- the present invention is not limited to this, and the present invention may be applied to an image display device other than the projector device.
- the present invention is preferably applied to an image display device in which the screen is difficult to see due to the influence of outside light or the like.
- an external light sensor may be attached to the front of the screen to measure the intensity of external light incident on the screen.
- the external light sensor may be removed from the projector device so that the brightness can be measured at an appropriate position according to the environment in which the projector device is used.
- the present invention is not limited to this.
- the correction coefficient may be determined in a plurality of stages other than. Further, the effect of the present invention is not changed even when a gradation number other than 8 bits: 256 gradations such as 10 bits: 1024 gradations is used.
- the image processing apparatus is a program that accepts a signal indicating the intensity of external light and executes the above-described gradation correction.
- the power described in the case where the correction coefficient C ′ is obtained by adjusting all the correction coefficients C (i 1 to 4).
- the correction coefficient C may be adjusted only for the low luminance part.
- the coefficient to be adjusted may be only the correction coefficient of the portion with the lowest luminance, or ⁇ and C, or C force may be adjusted.
- the value of the positive coefficient Q may be up to 80 at 256 gradations. In the case of 512 floors, it may be up to about 160. In this way, problems such as a decrease in contrast due to the narrowing of the output luminance range can be minimized.
- An image display device and an image display method according to the present invention are provided in an image display device! It is useful as a technique for correcting gradation so as to improve the visibility by eliminating the influence of external light.
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Priority Applications (3)
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US11/721,965 US7907135B2 (en) | 2005-03-29 | 2006-02-28 | Image display and image displaying method for gradation correction |
JP2007510342A JP4950031B2 (ja) | 2005-03-29 | 2006-02-28 | 画像表示装置及び画像表示方法 |
EP06714926A EP1865709A4 (en) | 2005-03-29 | 2006-02-28 | PROJECTOR AND IMAGE DISPLAY METHOD |
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JP2005095740 | 2005-03-29 | ||
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WO2006103862A1 true WO2006103862A1 (ja) | 2006-10-05 |
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PCT/JP2006/303802 WO2006103862A1 (ja) | 2005-03-29 | 2006-02-28 | 画像表示装置及び画像表示方法 |
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US (1) | US7907135B2 (ja) |
EP (1) | EP1865709A4 (ja) |
JP (1) | JP4950031B2 (ja) |
CN (1) | CN100493142C (ja) |
WO (1) | WO2006103862A1 (ja) |
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JP2009168466A (ja) * | 2008-01-10 | 2009-07-30 | Konica Minolta Sensing Inc | ディスプレイ用カラーセンサおよびそれを用いるディスプレイシステムならびにディスプレイの校正方法 |
US8144085B2 (en) * | 2007-05-18 | 2012-03-27 | Sony Corporation | Display device, control method and computer program for display device |
JP2012103328A (ja) * | 2010-11-08 | 2012-05-31 | Mk Seiko Co Ltd | 表示装置 |
CN109740586A (zh) * | 2018-12-19 | 2019-05-10 | 南京华科和鼎信息科技有限公司 | 一种防眩光证件自动阅读系统及方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN100493142C (zh) | 2009-05-27 |
CN101151886A (zh) | 2008-03-26 |
US20090251448A1 (en) | 2009-10-08 |
JPWO2006103862A1 (ja) | 2008-09-04 |
EP1865709A4 (en) | 2010-07-07 |
JP4950031B2 (ja) | 2012-06-13 |
EP1865709A1 (en) | 2007-12-12 |
US7907135B2 (en) | 2011-03-15 |
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