WO2016184142A1 - Procédé et appareil de correction de couleurs pour image de projection - Google Patents

Procédé et appareil de correction de couleurs pour image de projection Download PDF

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Publication number
WO2016184142A1
WO2016184142A1 PCT/CN2016/070732 CN2016070732W WO2016184142A1 WO 2016184142 A1 WO2016184142 A1 WO 2016184142A1 CN 2016070732 W CN2016070732 W CN 2016070732W WO 2016184142 A1 WO2016184142 A1 WO 2016184142A1
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Prior art keywords
primary color
light source
color component
value
projection light
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PCT/CN2016/070732
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English (en)
Chinese (zh)
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曾慧鹏
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中兴通讯股份有限公司
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Publication of WO2016184142A1 publication Critical patent/WO2016184142A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for color correction of a projected picture.
  • the SPROII projection in the related art is an intelligent terminal with projection, and supports three color adjustments on SPROII, respectively, cold, normal, warm, respectively representing three colors of cold, medium and warm, and these three tones are changed by projection.
  • the brightness of the LED bulbs is achieved, but these settings are fixed.
  • SPROIII began to have a function to automatically adapt the color of the wall.
  • the traditional projector only supports color temperature adjustment.
  • the fixed color temperature allows the projected image to be yellowish, neutral, and blue with several fixed color compensations, and the fixed compensation range is very limited.
  • the invention provides a color correction method and device for a projection picture, so as to solve at least the problem of color deviation of a projection picture caused by a relatively fixed color adjustment mode of the projector in the related art.
  • a color correction method for a projection image including: acquiring a projection background image in a projection area formed by the projection light source; and analyzing color information of each primary color component in the projection background image, wherein And the color information is used to at least indicate the brightness of the primary color component; the color deviation value of the primary color component is respectively obtained according to the color information of the projected background image; and the color light deviation value of the primary color component is respectively corrected for the projection light source and the above The color information of the primary color projection light source corresponding to the primary color component.
  • the parsing the color information of each of the primary color components in the projected background image comprises: parsing the grayscale value and the gray color component of the red primary color component in each of the pixels from each of the pixels of the projected background image a grayscale value of the order value and the blue primary color component; obtaining an average grayscale value of the red primary color component according to the grayscale value of the red primary color component of all the pixels of the projected background image; and the green primary color of all the pixels according to the projected background image
  • the grayscale value of the component obtains an average grayscale of the green primary color component; and obtains an average grayscale of the blue primary color component according to the grayscale value of the blue primary color component of all the pixels of the projected background image.
  • the correcting the color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, respectively comprising: acquiring a standard luminance value of each primary color projection light source in the projection light source, where
  • the primary color projection light source comprises a red primary color projection light source, a green primary color projection light source and a blue primary color projection light source;
  • the above R is used to represent the average gray scale value of the red primary color component R
  • the D_R is used to represent the color deviation value of the red primary color component R
  • the L_R is used to represent the standard luminance value of the red primary color projection light source
  • the New_L_R is used.
  • the above G is used to indicate An average grayscale value of the green primary color component G
  • the D_G is used to represent a color deviation value of the green primary color component G
  • the L_G is used to represent a standard luminance value of the green primary color projection light source
  • the New_L_G is used to represent the corrected green primary color.
  • the brightness value of the projection light source is used to represent the average gray level value of the blue primary color component B
  • the D_B is used to represent the color deviation value of the blue primary color component B
  • the L_B is used to indicate the standard brightness of the blue primary color projection light source.
  • the above New_L_B is used to indicate the brightness value of the corrected blue primary color projection light source.
  • the projecting the background image in the projection area formed by the acquiring the projection light source comprises: collecting the projection background image on the projection area by a camera of the projector, wherein an area of the projection background image is less than or equal to the projection area area.
  • the method further includes: projecting according to the corrected color information of the primary color projection light source The projected picture.
  • a color correction device for a projection screen comprising: an acquisition module configured to acquire a projection background image in a projection area formed by the projection light source; and an analysis module configured to parse the projection The color information of each of the primary color components in the background image, wherein the color information is used to at least indicate the brightness of the primary color component; and the acquiring module is configured to respectively obtain the color deviation value of the primary color component according to the color information of the projected background image; And a module configured to correct color information of the primary color projection light source corresponding to the primary color component of the projection light source according to the color deviation value of the primary color component.
  • the parsing module includes: an parsing unit configured to parse a grayscale value, a grayscale value of the green primary color component, and a blue primary color of the red primary color component in each of the pixels from each of the pixels of the projected background image a grayscale value of the component; the first acquiring unit is configured to obtain an average grayscale value of the red primary color component according to the grayscale value of the red primary color component of all the pixels of the projected background image; and according to the foregoing all pixels of the projected background image
  • the grayscale value of the green primary color component obtains an average grayscale of the green primary color component; according to the grayscale value of the blue primary color component of all pixels of the projected background image Get the average gray level of the blue base component.
  • D_R is used to represent the color deviation of the red primary color component R.
  • a value of G above is used to represent an average grayscale value of the green primary color component G, and the above D_G is used to represent a color deviation value of the green primary color component G; and B is used to represent an average grayscale value of the blue primary color component B, D_B is used to represent the color deviation value of the above-described blue primary color component B.
  • the color deviation value of the quantity G, the above L_G is used to indicate the standard brightness value of the green primary color projection light source
  • the New_L_G is used to represent the brightness value of the corrected green primary color projection light source
  • the above B is used to represent the average of the blue primary color component B.
  • the gray scale value, the above D_B is used to indicate the color deviation value of the blue primary color component B
  • the L_B is used to represent the standard luminance value of the blue primary color projection light source
  • the New_L_B is used to represent the luminance value of the corrected blue primary color projection light source.
  • the acquiring module is further configured to collect the projected background image on the projection area by using a camera of the projector, wherein an area of the projected background image is less than or equal to an area of the projection area.
  • the apparatus further includes: a projection module configured to: after correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, according to the corrected primary color The color information of the projection source projects the picture to be projected.
  • a projection module configured to: after correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, according to the corrected primary color The color information of the projection source projects the picture to be projected.
  • a projection background image in a projection area formed by a projection light source is acquired; color information of each primary color component in the projection background image is parsed, wherein the color information is at least used to indicate brightness of the primary color component;
  • the color information of the background image respectively obtains a color deviation value of the primary color component; and corrects color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the present invention separately obtains the color deviation value of the primary color component by projecting the color information of the background image, and dynamically corrects the color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, thereby realizing the projection background.
  • the color of the picture is dynamically corrected to solve the problem of color deviation of the projection picture caused by the fixed color adjustment mode of the projector in the related art, thereby achieving color correction of the projected background picture of different colors, thereby realizing
  • the effect of a white balance normal projection screen is displayed on the projected background image of different colors.
  • FIG. 1 is a flowchart of a color correction method of a projected picture according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the composition of a digital light processing DLP system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the operation of a DMD chip according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a method for displaying a screen of a projector according to an embodiment of the invention.
  • FIG. 5 is a block diagram showing the structure of a color correction device for a projected picture according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram (1) of a color correction device for a projected picture according to an embodiment of the present invention
  • FIG. 7 is a structural block diagram (2) of a color correction device for a projected picture according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram (3) of a color correction device for a projected picture according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a color correction method for a projection screen according to an embodiment of the present invention. As shown in FIG. 1, the flow includes the following steps:
  • Step S102 acquiring a projected background image in a projection area formed by the projection light source
  • Step S104 parsing color information of each primary color component in the projected background picture, wherein the color information is at least used to indicate the brightness of the primary color component;
  • Step S106 respectively acquiring color deviation values of the primary color components according to the color information of the projected background image
  • Step S108 respectively correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the color correction method of the projection screen may include, but is not limited to, based on digital light.
  • the processing Digital Light Processing, DLP for short
  • the projection background image in the projection area formed by the projection light source is collected, and the color information of each primary color component in the projected background image is analyzed, and the color deviation values of the primary color components are respectively obtained.
  • the problem of color deviation due to the manner in which the brightness of the projected LED light bulb is changed by fixing three color tones for example, cold, medium, and warm three colors
  • the projected background image may include, but is not limited to, a background image for displaying a projected image captured by a camera of the projector.
  • the background image may be a wall surface, a curtain, or the like. That is to say, the color correction method of the projection screen can perform color adjustment on the projection background images of different colors, so as to avoid the influence of the projection background images of different colors on the projection image when the image to be projected is projected, so as to achieve display. White balances the effect of a normal projection screen.
  • each of the foregoing primary color components may include, but is not limited to, a red primary color component, a green primary color component, and a blue primary color component.
  • the color information may include, but is not limited to, a brightness for indicating the primary color component, wherein the color information of each primary color component in the projected background image may include, but is not limited to, a grayscale value of each primary color component.
  • the color information of the primary color projection light source may include, but is not limited to, a brightness value of the light source.
  • FIG. 2 is a schematic diagram of the composition of a digital light processing DLP system in accordance with an embodiment of the present invention.
  • the DLP system has the following key components:
  • the light source of the DLP system is composed of three LED lights (ie R-LED, G-LED and B-LED), which respectively correspond to the light emitting RED (represented by R) and the light of GREEN (indicated by G). , BLUE (indicated by B) color of light, the higher the brightness of the LED, the higher the brightness of the projected picture.
  • the DMD chip is the core display device in the DLP projection system. It is composed of many small mirrors that can be rotated.
  • 3 is a schematic diagram of the operation of a DMD chip according to an embodiment of the present invention. As shown in FIG. 3, small mirrors are arranged in a row of pixels, and each small mirror corresponds to each pixel of the image, or each pixel of the image is controlled. The deflection angle of a small mirror.
  • the RGB data of each pixel of the image is decomposed, the RGB lights of the control LED are respectively switched.
  • the R lamp is turned on, the small mirror is deflected according to the value of R. The larger the R value, the more light the mirror reflects, G, The B lamp is turned on in the same way, and through this process, the correct brightness of RGB is reflected in the image of one frame.
  • the light reflected by the small mirror is concentrated, and then projected onto the screen according to the focal length. Different focal lengths are realized by the lens group in the lens, and the image clarity and size of the screen can be adjusted by the focal length.
  • the DLP projection is realized by the above-mentioned key components.
  • the specific projection flow diagram is shown in FIG. 4 , wherein the projection light source on the projector shown in FIG. 4 is focused on the screen and imaged.
  • the camera on the projector focuses on the reflected light obtained by the reflected light reflected from the center of the screen, and then captures the center of the projection area through the camera after focusing on the projector.
  • the picture data on the DMD chip changes the mirror flip of the DMD chip to change the intensity of the RGB light, and realizes different colors and brightness of each pixel of the picture, by changing three LEDs of R, G, B
  • the brightness of the picture can be used to control the color balance of the picture as a whole.
  • the method for parsing the color information of each of the primary color components in the projected background image includes, but is not limited to, from the projected background image.
  • the grayscale values of the three primary color components are parsed in each pixel, and then the average grayscale values of the three primary color components of all pixels of the projected background image are respectively parsed; or, each pixel of the central image of the projected background image is parsed out
  • the grayscale values of the three primary color components are then respectively parsed out the average grayscale values of the three primary color components of all pixels of the projected background image.
  • the area of the projected background image and the area of the projected area in the projection area formed by the collected projection light source include, but are not limited to, the area of the projected background image is less than or equal to the projection area. area.
  • correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source includes, but is not limited to, correcting a primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the color information, or the color information of the primary color projection light source corresponding to the primary color component in the projection light source is corrected according to a preset threshold of the primary color component.
  • the method further includes, but is not limited to, following the corrected primary color.
  • the color information of the projection source projects the picture to be projected.
  • parsing color information of each primary color component in the projected background image includes at least the following steps:
  • Step S11 parsing the grayscale value of the red primary color component, the grayscale value of the green primary color component, and the grayscale value of the blue primary color component in each pixel from each pixel of the projected background image;
  • Step S12 Obtain an average grayscale value of a red primary color component according to a grayscale value of a red primary color component of all pixels of the projected background image; and obtain a green primary color component according to a grayscale value of the green primary color component of all pixels of the projected background image.
  • An average grayscale value; an average grayscale value of the blue primary color component is obtained according to a grayscale value of the blue primary color component of all pixels of the projected background image.
  • the grayscale value of the red primary color component, the grayscale value of the green primary color component, and the grayscale value of the blue primary color component in each pixel parsed in each pixel of different projected background images are different.
  • step S11 is exemplified in combination with the following examples.
  • the background image of the camera obtained under blue, red, white, and yellow walls and the grayscale value of the RGB channel of each background image are mainly used.
  • the gray component value of the obtained R component is between 0-100, the grayscale value of the G component is between 100-255, and the grayscale value of the B component is close to 255; if the background color is red Then, the gray component value of the obtained R component is between 100 and 255, the grayscale value of the G and B components is between 100 and 255, and the grayscale value of the B channel is close to 255; if the background color is white, R, G The values of B and B are similar, about 100-255; if the background color is yellow, R, G The grayscale value is close to 255 and the value of B is close to 100.
  • Red wall R component is large; blue wall: B component is large; white wall: RGB is almost; yellow wall: R and G components are greater than B.
  • the average grayscale values of the primary color components of the red, green, and blue primary colors can be calculated by:
  • X is the image width and Y is the image height.
  • Y is the image height.
  • n X*Y pixels.
  • the color of each pixel is composed of 16 bits of RGB, a total of 48 bytes, and the upper 16 bytes represent R, the middle 16 words.
  • the section represents G and the lower 16 bytes represent B.
  • 0xFF0000 means red
  • 0x00FF00 means green
  • 0x0000FF means blue
  • 0x333333 is gray.
  • the color component of each pixel is obtained by taking 16 bytes of the high, middle, and low bits, which is a value between 0 and 255.
  • mRi is assumed to be the grayscale value of the red primary color component of pixel point i, where i is a natural number from 1 to n.
  • the average grayscale value of G and B can be obtained.
  • the average grayscale values of the three primary color components of red, green, and blue components are obtained according to the grayscale values of the red, green, and blue primary color components of all the pixels of the projected background image, thereby improving the primary color corresponding to the primary color component in the corrected projection light source.
  • the accuracy of the color information of the projection light source further solves the problem of color deviation of the projection image caused by the fixed color adjustment mode of the projector in the related art, thereby achieving color correction of the projected background image of different colors.
  • the effect of displaying a projection screen with a normal white balance on a projected background image of different colors is realized.
  • respectively obtaining the color deviation value of the primary color component according to the color information of the projected background image includes the following steps:
  • Step S21 calculating a color deviation value of the red primary color component R, the green primary color component G, and the blue primary color component B in the projected background picture by:
  • D_R (R-A_RGB)/A_RGB
  • D_G (G-A_RGB)/A_RGB
  • D_B (B-A_RGB)/A_RGB.
  • A_RGB is used to represent the average gray scale value of the red primary color component R in the projected background picture, the average grayscale value of the green primary color component G, and the average grayscale value of the blue primary color component B.
  • a value of R is used to represent an average grayscale value of the red primary color component R
  • the D is used to represent a color deviation value of the red primary color component R
  • the G is used to represent an average grayscale value of the green primary color component G
  • D_G is used to represent the color deviation value of the green primary color component G
  • the B is used to represent the average grayscale value of the blue primary color component B
  • the D_B is used to represent the color deviation value of the blue primary color component B.
  • respectively correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component comprises the following steps:
  • Step S31 obtaining a standard brightness value of each of the primary color projection light sources in the projection light source, wherein the primary color projection light source comprises a red primary color projection light source, a green primary color projection light source, and a blue primary color projection light source;
  • Step S32 calculating the brightness value of the corrected primary color projection light source by:
  • New_L_R L_R-A_L_RGB*D_R,
  • New_L_G L_G-A_L_RGB*D_G,
  • New_L_B L_B-A_L_RGB*D_B.
  • A_L_RGB is used to represent the average brightness value of the red primary color projection light source, the standard brightness value of the green primary color projection light source, and the average brightness value of the blue primary color projection light source;
  • the R is used to indicate An average grayscale value of the red primary color component R
  • the D_R is used to represent a color deviation value of the red primary color component R
  • the L_R is used to represent a standard luminance value of the red primary color projection light source
  • the New_L_R is used to represent the corrected red color.
  • the luminance value of the primary color projection light source is used to represent the average grayscale value of the green primary color component G, and the D_G is used to represent the color deviation value of the green primary color component G, and the L_G is used to represent the standard of the green primary color projection light source.
  • a luminance value is used to indicate a luminance value of the corrected green primary color projection light source
  • the B is used to represent an average grayscale value of the blue primary color component B
  • the D_B is used to represent a color deviation value of the blue primary color component B
  • the L_B is used to indicate a standard luminance value of the blue primary color projection light source
  • the New_L_B is used to represent the luminance value of the corrected blue primary color projection light source.
  • the color compensation can be realized. Further, the problem of color deviation of the projection image caused by the fixed color adjustment mode of the projector in the related art is further solved, thereby achieving color correction of the projected background images of different colors to realize the projection background images of different colors. The effect of the projection screen with normal white balance is displayed.
  • acquiring the projected background image in the projection area formed by the projection light source comprises the following steps:
  • step S41 the projected background image is acquired on the projection area by the camera of the projector.
  • the area of the projected background picture is less than or equal to the area of the projection area; the camera of the projector may be the front camera of the projector.
  • the projection background image is acquired by using a projection camera (for example, a front camera), and the projection background image is further analyzed, and the color information of the primary color projection light source is corrected according to the analysis result, thereby further solving the color of the projector in the related art.
  • the problem of color deviation of the projection screen caused by the fixed adjustment method is fixed, and the color correction of the projected background image of different colors is achieved, so as to realize the effect of displaying the projection screen with normal white balance on the projected background image of different colors.
  • the method further includes the following steps:
  • Step S51 projecting the picture to be projected according to the color information of the corrected primary color projection light source.
  • the image to be projected is projected according to the color information of the corrected primary color projection light source, so that a white balance normal image can be seen on the wall of different colors, thereby dynamically adjusting the projection according to different colors of the projected background image.
  • the effect of the picture is a white balance normal image.
  • the method mainly includes the following steps:
  • Step S62 driving the camera to use a specific iso, taking a photo of the shutter aperture to obtain a picture of the projection center;
  • Step S63 analyzing the average grayscale value of the R, G, and B components of the picture of the center screen, and calculating the average grayscale value as follows:
  • X is the image width and Y is the image height.
  • Y is the image height.
  • the color of each pixel is composed of 16 bits of RGB, a total of 48 bytes, and the upper 16 bytes represent R, the middle 16 bytes. Indicates G, and the lower 16 bytes represent B.
  • 0xFF0000 means red
  • 0x00FF00 means green
  • 0x0000FF means blue
  • 0x333333 is gray.
  • the color component of each pixel is obtained by taking 16 bytes of high, medium, and low bits, which is a value between 0 and 255, assuming that mR is the component value of a certain pixel red.
  • D_R, D_G, and D_B are calculated according to the following formulas, and the three values respectively represent the percentage deviation of red, green, and blue with respect to other colors:
  • A_RGB (R+G+B)/3;
  • D_R (R-A_RGB)/A_RGB;
  • D_G (G-A_RGB)/A_RGB;
  • D_B (B-A_RGB)/A_RGB;
  • Step S65 calculating new brightness values New_L_R, New_L_G, New_L_B of the R, G, and B lamps of the optical machine to be adjusted according to D_R, D_G, and D_B,
  • A_L_RGB (L_R+L_G+L_B)/3;
  • New_L_R L_R-A_L_RGB*D_R;
  • New_L_G L_G-A_L_RGB*D_G;
  • New_L_B L_B-A_L_RGB*D_B;
  • Step S66 setting New_L_R, New_L_G, New_L_B to the LED hardware driving module, so that the RGB lights of the LED are adjusted according to the new brightness.
  • the micro-injection based on autofocus has a camera (for example, a front camera), and the camera can capture the sharpness, brightness and color of the image, and the function of capturing the color of the image by using the camera can be
  • This information is used as a data source, and three data of R, G, B (red, green, and blue) of the image are calculated, and the brightness of three LED lights of R, G, and B in the projection is guided according to the calculated result.
  • the invention solves the problem that the projection screen has a color deviation caused by the fixed color adjustment mode of the projector in the related art, and further achieves color correction on the projected background images of different colors to realize display on the projected background images of different colors. White balances the effect of a normal projection screen.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention in essence or the contribution to the related art can be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM).
  • the instructions include a number of instructions for causing a terminal device (which may be a cell phone, computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a color correction device for a projection screen is also provided, which is used to implement the above-described embodiments and preferred embodiments, and the detailed description thereof has been omitted.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 5 is a structural block diagram of a color correction device for a projected picture according to an embodiment of the present invention. As shown in FIG. 5, the device includes:
  • the acquisition module 52 is configured to collect a projection background image in a projection area formed by the projection light source
  • the parsing module 54 is configured to parse color information of each of the primary color components in the projected background image, wherein the color information is at least used to indicate the brightness of the primary color component;
  • the obtaining module 56 is configured to respectively obtain a color deviation value of the primary color component according to the color information of the projected background image
  • the correction module 58 is configured to respectively correct color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the color correction device of the projection screen may include, but is not limited to, a projection area formed by acquiring a projection light source in a Digital Light Processing (DLP) system.
  • the projection background image is used to parse the color information of each primary color component in the projected background image, and respectively obtain the color deviation values of the primary color components, so as to respectively correct the projection background images corresponding to the different color information to respectively correct the primary color projection corresponding to the primary color components in the projection light source.
  • Color information of the light source to achieve color correction of the projected background image of different colors The effect of a white balance normal projection screen is displayed on the projected background image of different colors.
  • three color tones for example, cold, medium, and warm three colors
  • the projected background image may include, but is not limited to, a background image for displaying a projected image captured by a camera of the projector.
  • the background image may be a wall surface, a curtain, or the like. That is to say, the color correction method of the projection screen can perform color adjustment on the projection background images of different colors, so as to avoid the influence of the projection background images of different colors on the projection image when the image to be projected is projected, so as to achieve display. White balances the effect of a normal projection screen.
  • each of the foregoing primary color components may include, but is not limited to, a red primary color component, a green primary color component, and a blue primary color component.
  • the color information may include, but is not limited to, a brightness for indicating the primary color component, wherein the color information of each primary color component in the projected background image may include, but is not limited to, a grayscale value of each primary color component.
  • the color information of the primary color projection light source may include, but is not limited to, a brightness value of the light source.
  • FIG. 2 is a schematic diagram of the composition of a digital light processing DLP system in accordance with an embodiment of the present invention.
  • the DLP system has the following key components:
  • the light source of the DLP system is composed of three LED lights (ie R-LED, G-LED and B-LED), which respectively correspond to the light emitting RED (represented by R) and the light of GREEN (indicated by G). , BLUE (indicated by B) color of light, the higher the brightness of the LED, the higher the brightness of the projected picture.
  • the DMD chip is the core display device in the DLP projection system. It is composed of many small mirrors that can be rotated.
  • 3 is a schematic diagram of the operation of a DMD chip according to an embodiment of the present invention. As shown in FIG. 3, small mirrors are arranged in a row of pixels, and each small mirror corresponds to each pixel of the image, or each pixel of the image is controlled. The deflection angle of a small mirror.
  • the RGB data of each pixel of the image is decomposed, the RGB lights of the control LED are respectively switched.
  • the R lamp is turned on, the small mirror is deflected according to the value of R. The larger the R value, the more light the mirror reflects, G, The B lamp is turned on in the same way, and through this process, the correct brightness of RGB is reflected in the image of one frame.
  • the light reflected by the small mirror is concentrated, and then projected onto the screen according to the focal length. Different focal lengths are realized by the lens group in the lens, and the image clarity and size of the screen can be adjusted by the focal length.
  • the DLP projection is realized by the above-mentioned key components.
  • the specific projection flow diagram is shown in FIG. 4 , wherein the projection light source on the projector shown in FIG. 4 is focused on the screen and imaged.
  • the camera on the projector focuses on the reflected light obtained by the reflected light reflected from the center of the screen, and then captures the center of the projection area through the camera after focusing on the projector.
  • the picture data on the DMD chip changes the mirror flip of the DMD chip to change the intensity of the RGB light, and realizes different colors and brightness of each pixel of the picture, by changing three LEDs of R, G, B
  • the brightness of the picture can be used to control the color balance of the picture as a whole.
  • the apparatus for parsing the color information of each of the primary color components in the projected background image includes, but is not limited to, from the projected background image.
  • the grayscale values of the three primary color components are parsed in each pixel, and then the average grayscale values of the three primary color components of all pixels of the projected background image are respectively parsed; or, each pixel of the central image of the projected background image is parsed out
  • the grayscale values of the three primary color components are then respectively parsed out the average grayscale values of the three primary color components of all pixels of the projected background image.
  • the area of the projected background image and the area of the projected area in the projection area formed by the collected projection light source include, but are not limited to, the area of the projected background image is less than or equal to the projection area. area.
  • correcting color information of the primary color projection light source corresponding to the primary color component in the projection light source includes, but is not limited to, correcting a primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the color information, or the color information of the primary color projection light source corresponding to the primary color component in the projection light source is corrected according to a preset threshold of the primary color component.
  • the method further includes, but is not limited to, following the corrected primary color.
  • the color information of the projection source projects the picture to be projected.
  • FIG. 6 is a structural block diagram (1) of a color correction device for a projected picture according to an embodiment of the present invention.
  • the analysis module 54 includes:
  • the parsing unit 62 is configured to parse out the grayscale value of the red primary color component, the grayscale value of the green primary color component, and the grayscale value of the blue primary color component in each pixel of the projected background picture;
  • the first obtaining unit 64 is configured to obtain an average grayscale value of the red primary color component according to the grayscale value of the red primary color component of all pixels of the projected background image; the green primary color component of all pixels of the projected background image
  • the grayscale value obtains an average grayscale value of the green primary color component; and obtains an average grayscale value of the blue primary color component according to the grayscale value of the blue primary color component of all pixels of the projected background image.
  • the grayscale value of the red primary color component, the grayscale value of the green primary color component, and the grayscale value of the blue primary color component in each pixel parsed in each pixel of different projected background images are different.
  • the grayscale value of the red primary color component, the grayscale value of the green primary color component, and the grayscale value of the blue primary color component in each pixel are respectively parsed from each pixel of the projected background image. .
  • the background image of the camera obtained under blue, red, white, and yellow walls and the grayscale value of the RGB channel of each background image are mainly used.
  • the gray component value of the obtained R component is between 0-100, the grayscale value of the G component is between 100-255, and the grayscale value of the B component is close to 255; if the background color is red Then, the gray component value of the obtained R component is between 100 and 255, the grayscale value of the G and B components is between 100 and 255, and the grayscale value of the B channel is close to 255; if the background color is white, R, G The values of B and B are similar, about 100-255. If the background color is yellow, the grayscale values of R and G are close to 255, and the value of B is close to 100.
  • Red wall R component is large; blue wall: B component is large; white wall: RGB is almost; yellow wall: R and G components are greater than B.
  • the average grayscale values of the primary color components of the red, green, and blue primary colors can be calculated by:
  • X is the image width and Y is the image height.
  • Y is the image height.
  • n X*Y pixels.
  • the color of each pixel is composed of 16 bits of RGB, a total of 48 bytes, and the upper 16 bytes represent R, the middle 16 words.
  • the section represents G and the lower 16 bytes represent B.
  • 0xFF0000 means red
  • 0x00FF00 means green
  • 0x0000FF means blue
  • 0x333333 is gray.
  • the color component of each pixel is obtained by taking 16 bytes of high, medium, and low bits, which is a value between 0 and 255.
  • mRi is assumed to be the grayscale value of the red primary color component of pixel point i, where i is a natural number from 1 to n.
  • the average grayscale value of G and B can be obtained.
  • the average grayscale values of the three primary color components of red, green, and blue components are obtained according to the grayscale values of the red, green, and blue primary color components of all the pixels of the projected background image, thereby improving the primary color corresponding to the primary color component in the corrected projection light source.
  • the accuracy of the color information of the projection light source further solves the problem of color deviation of the projection image caused by the fixed color adjustment mode of the projector in the related art, thereby achieving color correction of the projected background image of different colors.
  • the effect of displaying a projection screen with a normal white balance on a projected background image of different colors is realized.
  • the obtaining module 66 is further configured to calculate a color deviation value of the red primary color component R, the green primary color component G, and the blue primary color component B in the projected background image by:
  • D_R (R-A_RGB)/A_RGB
  • D_G (G-A_RGB)/A_RGB
  • D_B (B-A_RGB)/A_RGB
  • the A_RGB is used to represent an average value of the average grayscale value of the red primary color component R, the average grayscale value of the green primary color component G, and the average grayscale value of the blue primary color component B in the projected background image;
  • the R is used to represent an average grayscale value of the red primary color component R
  • the D_R is used to represent a color deviation value of the red primary color component R
  • the G is used to represent an average grayscale value of the green primary color component G
  • the D_G is used for the D_G
  • the color deviation value indicating the green primary color component G is used to represent the average grayscale value of the blue primary color component B
  • the D_B is used to represent the color deviation value of the blue primary color component B.
  • FIG. 7 is a structural block diagram (2) of a color correction device for a projected picture according to an embodiment of the present invention.
  • the correction module 58 includes:
  • the second obtaining unit 72 is configured to acquire a standard brightness value of each of the primary color projection light sources in the projection light source, wherein the primary color projection light source comprises a red primary color projection light source, a green primary color projection light source, and a blue primary color projection light source;
  • the calculating unit 74 is configured to calculate the brightness value of the corrected primary color projection light source by:
  • New_L_R L_R-A_L_RGB*D_R,
  • New_L_G L_G-A_L_RGB*D_G,
  • New_L_B L_B-A_L_RGB*D_B,
  • the A_L_RGB is used to represent an average value of a standard brightness value of the red primary color projection light source, a standard brightness value of the green primary color projection light source, and a standard brightness value of the blue primary color projection light source;
  • the R is used to represent the red primary color.
  • An average grayscale value of the component R the D_R is used to represent a color deviation value of the red primary color component R, the L_R is used to represent a standard luminance value of the red primary color projection light source, and the New_L_R is used to represent the corrected red primary color projection light source.
  • the G is used to represent an average grayscale value of the green primary color component G
  • the D_G is used to represent a color deviation value of the green primary color component G
  • the L_G is used to represent a standard luminance value of the green primary color projection light source
  • the New_L_G is used to represent the luminance value of the corrected green primary color projection light source
  • the B is used to represent the average grayscale value of the blue primary color component B
  • the D_B is used to represent the color deviation value of the blue primary color component B
  • the L_B is used for the L_B
  • the New_L_B is used to represent the brightness value of the corrected blue primary color projection light source.
  • the color compensation can be realized. Further, the problem of color deviation of the projection image caused by the fixed color adjustment mode of the projector in the related art in the related art is further solved, thereby achieving color correction of the projected background images of different colors to realize projection in different colors.
  • the effect of the projection screen with normal white balance is displayed on the background screen.
  • the acquiring module 62 is further configured to collect the projected background image on the projection area by using a camera of the projector, wherein an area of the projected background image is less than or equal to an area of the projected area.
  • the area of the projected background picture is less than or equal to the area of the projection area; the camera of the projector may be the front camera of the projector.
  • the projection background image is acquired by using a projection camera (for example, a front camera), and the projection background image is further analyzed, and the color information of the primary color projection light source is corrected according to the analysis result, thereby further solving the color of the projector in the related art.
  • the problem of color deviation of the projection screen caused by the fixed adjustment method is fixed, and the color correction of the projected background image of different colors is achieved, so as to realize the effect of displaying the projection screen with normal white balance on the projected background image of different colors.
  • the device includes: in addition to all the modules shown in FIG. 5, the device includes:
  • the projection module 82 is configured to, after correcting the color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, projecting according to the corrected color information of the primary color projection light source The picture to be projected.
  • the image to be projected is projected according to the color information of the corrected primary color projection light source, so that a white balance normal image can be seen on the wall of different colors, thereby dynamically adjusting the projection according to different colors of the projected background image.
  • the effect of the picture is a white balance normal image.
  • the method mainly includes the following steps:
  • Step S62 driving the camera to use a specific iso, taking a photo of the shutter aperture to obtain a picture of the projection center;
  • Step S63 analyzing the average grayscale value of the R, G, and B components of the picture of the center screen, and calculating the average grayscale value as follows:
  • X is the image width and Y is the image height.
  • Y is the image height.
  • n X*Y pixels.
  • the color of each pixel is composed of 16 bits of RGB, a total of 48 bytes, and the upper 16 bytes represent R, the middle 16 bytes. Indicates G, and the lower 16 bytes represent B.
  • 0xFF0000 means red
  • 0x00FF00 means green
  • 0x0000FF means blue
  • 0x333333 is gray.
  • the color component of each pixel is obtained by taking 16 bytes of the high, middle, and low bits, which is a value between 0 and 255.
  • mRi is assumed to be the grayscale value of the red primary color component of pixel point i, where i is a natural number from 1 to n.
  • the average grayscale value of G and B can be obtained;
  • D_R, D_G, and D_B are calculated according to the following formulas, and the three values respectively represent the percentage deviation of red, green, and blue with respect to other colors:
  • A_RGB (R+G+B)/3;
  • D_R (R-A_RGB)/A_RGB;
  • D_G (G-A_RGB)/A_RGB;
  • D_B (B-A_RGB)/A_RGB;
  • Step S65 calculating new brightness values New_L_R, New_L_G, New_L_B of the R, G, and B lamps of the optical machine to be adjusted according to D_R, D_G, and D_B:
  • A_L_RGB (L_R+L_G+L_B)/3;
  • New_L_R L_R-A_L_RGB*D_R;
  • New_L_G L_G-A_L_RGB*D_G;
  • New_L_B L_B-A_L_RGB*D_B;
  • Step S66 setting New_L_R, New_L_G, New_L_B to the LED hardware driving module, so that the RGB lights of the LED are adjusted according to the new brightness.
  • the embodiment of the present invention has a camera (for example, a front camera) through micro-focusing based on auto focus, and the camera can capture the sharpness, brightness and color of the image, and the camera can capture the color of the image.
  • the information is used as a data source, and three data of R, G, B (red, green, and blue) of the image are calculated, and the brightness of three LED lights of R, G, and B in the projection is guided according to the calculated result.
  • the invention solves the problem that the projection screen has a color deviation caused by the fixed color adjustment mode of the projector in the related art, and further achieves color correction on the projected background images of different colors to realize display on the projected background images of different colors. White balances the effect of a normal projection screen.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • a storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the processor performs the above steps S1, S2, S3, and S4 according to the stored program code in the storage medium.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described Alternatively, each of them may be fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof may be fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • a projection background image in a projection area formed by a projection light source is acquired; color information of each primary color component in the projection background image is parsed, wherein the color information is at least used to indicate brightness of the primary color component;
  • the color information of the background image respectively obtains a color deviation value of the primary color component; and corrects color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component.
  • the present invention separately obtains the color deviation value of the primary color component by projecting the color information of the background image, and dynamically corrects the color information of the primary color projection light source corresponding to the primary color component in the projection light source according to the color deviation value of the primary color component, thereby realizing the projection background.
  • the color of the picture is dynamically corrected to solve the problem of color deviation of the projection picture caused by the fixed color adjustment mode of the projector in the related art, thereby achieving color correction of the projected background picture of different colors to achieve different
  • the effect of the projection screen with normal white balance is displayed on the projected background image of the color.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

Procédé et appareil de correction de couleurs pour image de projection. Le procédé comporte les étapes consistant à: recueillir une image d'arrière-plan de projection dans une zone de projection formé par des sources lumineuses de projection; analyser des informations de couleurs concernant chaque composante de couleur primaire dans l'image d'arrière-plan de projection, les informations de couleurs étant au moins utilisées pour indiquer la luminosité des composantes de couleurs primaires; acquérir, en fonction des informations de couleurs de l'image d'arrière-plan de projection, des valeurs d'écart de couleurs des composantes de couleurs primaires respectivement; et corriger, en fonction des valeurs d'écart de couleurs des composantes de couleurs primaires, des informations de couleurs concernant respectivement des sources lumineuses de projection de couleurs primaires correspondant aux composantes de couleurs primaires dans les sources lumineuses de projection. Le procédé résout le problème de l'écart de couleurs d'une image de projection causé par un mode relativement fixe de réglage de couleurs d'un projecteur dans la technique apparentée, ce qui a pour effet d'afficher une image de projection avec une balance de blancs normale sur des images d'arrière-plan de projection de différentes couleurs au moyen d'une correction de couleurs pour les images d'arrière-plan de projection de différentes couleurs.
PCT/CN2016/070732 2015-11-25 2016-01-12 Procédé et appareil de correction de couleurs pour image de projection WO2016184142A1 (fr)

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