CN113035118B - Method for correcting color temperature and brightness consistency of multiple display screens - Google Patents
Method for correcting color temperature and brightness consistency of multiple display screens Download PDFInfo
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- CN113035118B CN113035118B CN202110285753.1A CN202110285753A CN113035118B CN 113035118 B CN113035118 B CN 113035118B CN 202110285753 A CN202110285753 A CN 202110285753A CN 113035118 B CN113035118 B CN 113035118B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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Abstract
The invention discloses a method for correcting the color temperature and brightness consistency of a plurality of display screens. The method comprises the steps of obtaining a picture of a display screen, analyzing the obtained picture of the display screen according to an algorithm, collecting an algorithm of RGB (red, green and blue) values of a central point of the display screen on the picture, and designing a flow and an algorithm for automatically adjusting the color temperature and the brightness of the display screen according to the RGB values. According to the invention, the RGB values of the pixel points in the center of the image are obtained by shooting the image of the display screen, so that the image is consistent.
Description
Technical Field
The invention relates to the field of color temperature and brightness adjustment of display screens, in particular to a method for correcting color temperature and brightness consistency of a plurality of display screens.
Background
The display screen produced at present has certain color temperature and brightness difference, and the color difference can be distinguished by naked eye observation. Especially, the color difference of the pictures of a plurality of display screens is obvious for the display screen splicing wall product. In the existing processing method, an engineer observes the color temperature and the brightness of the display screen by naked eyes, the adjusting speed is low, and color difference still exists.
Currently, the correction effect can only be adjusted by depending on the experience of an engineer and by means of visual observation, and the correction effect greatly depends on the related technical level and the adjustment experience of the engineer, and the time consumption is large.
Disclosure of Invention
The invention aims to provide a method for correcting color temperature and brightness consistency of a plurality of display screens.
The technical scheme adopted by the invention is as follows:
the method for correcting the color temperature and brightness consistency of a plurality of display screens comprises the following steps:
step 1, selecting a display screen as a standard screen and other display screens as target screens, and acquiring 4 GAIN values of the standard screen, wherein the GAIN values are (R \ G \ B GAIN and backlight);
step 2, shooting the standard screen and obtaining a color RGB value of a standard screen picture;
step 3, selecting an uncalibrated display screen from all target screens as a current target screen, and acquiring GAIN values of the current target screen, wherein the GAIN values are (R \ G \ B GAIN and backlight);
step 4, shooting the current target screen and acquiring the color RGB value of the current target screen picture;
step 5, judging whether the difference degree between the 4 gain values of the current target screen and the 4 gain values of the standard screen is in the maximum limit range; if yes, executing step 6; otherwise, synchronizing 4 gain values of the standard screen to the current target screen;
Step 6, judging whether the fixed Gain value of the current target screen is the same as the fixed Gain value (maximum R \ G \ B Gain value) of the standard screen; if yes, executing step 7; otherwise, synchronizing the fixed gain value of the standard screen to the current target screen;
step 7, correspondingly calculating the difference value between the color RGB value of the current target screen and the color RGB value of the standard screen;
step 8, judging whether the difference value of the current target screen is within an allowable range; if so, judging that the current target screen is successfully calibrated, and executing the step 10; otherwise, executing step 9;
step 9, judging whether the calibration times are less than the set calibration wheel number N; if yes, adjusting one or more gain values in 4 gain values according to a calibration algorithm by the current target screen, adding 1 to the calibration times, and executing the step 4; otherwise, judging that the current target screen calibration fails and executing the step 10
Step 10, judging whether all the target screens are calibrated; if so, ending the calibration; otherwise, step 3 is executed.
Further, as a preferred embodiment, the specific method for shooting the standard screen in step 2 or shooting the current target screen in step 4 is as follows:
a1, drawing a shooting calibration frame in the shooting display frame, and setting a central setting area in the shooting calibration frame;
Step a2, keeping the display screen in the shooting calibration frame and the frame of the display screen outside the central setting area during shooting;
step a3, adjusting the shooting device to make the parallel offset degree of the four sides of the display screen relative to the corresponding calibration frame sides less than a set value;
step a4, setting fixed parameters for the shooting device and acquiring a picture of a display screen in a focusing state.
Further, as a preferred embodiment, the method for calculating the RGB value of the center point on the picture of the display screen:
step b1, obtaining the coordinates of four vertexes of the frame of the display screen on the picture,
step b2, acquiring the coordinates of the central point of the display screen according to the four vertexes,
and b3, taking the average value of the RGB values of a plurality of pixel points at the center point of the picture display screen as the picture RGB value of the display screen.
Further, as a preferred embodiment, a plurality of pictures are taken, the RGB value of each picture is calculated, and then the average value of the RGB values of all the pictures is used as the RGB value corresponding to the display screen.
Further, as a preferred embodiment, in step 7, the allowable range of the difference value of the current target screen is set to R3G1B 3.
Further, as a preferred embodiment, in step 9, the value of the number N of calibration rounds is set to be an integer greater than 1.
Further, as a preferred embodiment, the value of the number N of calibration rounds is set to be not more than 30.
By adopting the technical scheme, the fixed Gain is set according to the R \ G \ B Gain value of the selected standard display screen. Comparing R \ G \ B Gain values and backlight values of the standard screen and the target screen through an algorithm, determining whether to initially adjust the target screen, and synchronizing single or multiple setting values of the standard screen to the target screen. A color temperature and brightness automatic correction system (such as a mobile phone and a corresponding APP) is installed through third-party equipment (comprising a camera and an operating system), a plurality of display screens are automatically shot, and the color temperature and the brightness of each display screen are automatically calculated and adjusted through a set flow and an algorithm, so that the color temperature and the brightness of the adjusted plurality of display screens tend to be consistent. The method is suitable for adjusting the brightness and the color temperature of the LED screens by constructors when installing LED screen scenes.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic diagram of a preliminary adjustment process of a method for correcting color temperature and brightness uniformity of multiple display screens according to the present invention;
FIG. 2 is a schematic view of RGB Gain and backlight calibration process of the method for correcting color temperature and brightness uniformity of multiple display screens according to the present invention;
FIG. 3 is a diagram illustrating a state of a calibration frame during image capture of a display screen according to the present invention;
FIG. 4 is a second schematic diagram illustrating a state of a calibration frame during image capture of a display screen according to the present invention;
FIG. 5 is a schematic diagram illustrating a calculation process of the RGB value of the center point on the picture of the display screen according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1 to fig. 5, the present invention discloses a method for correcting color temperature and brightness uniformity of a plurality of display screens, which comprises the following steps:
step 1, selecting a display screen as a standard screen and other display screens as target screens, and acquiring GAIN values (R \ G \ B GAIN and backlight) of the standard screen;
step 2, shooting the standard screen and acquiring a color RGB value of a standard screen picture;
step 3, selecting an uncalibrated display screen from all target screens as a current target screen, and acquiring a GAIN value (R \ G \ B GAIN, backlight) of the current target screen;
step 4, shooting the current target screen and acquiring the color RGB value of the current target screen picture;
step 5, judging whether the difference degree between the 4 gain values of the current target screen and the 4 gain values of the standard screen is in the maximum limit range; if yes, executing step 6; otherwise, synchronizing 4 gain values of the standard screen to the current target screen;
Step 6, judging whether the fixed Gain value of the current target screen is the same as the fixed Gain value (maximum R \ G \ B Gain value) of the standard screen; if yes, executing step 7; otherwise, synchronizing the fixed gain value of the standard screen to the current target screen;
step 7, correspondingly calculating the difference value between the color RGB value of the current target screen and the color RGB value of the standard screen;
step 8, judging whether the difference value of the current target screen is within an allowable range; if so, judging that the current target screen is successfully calibrated, and executing the step 10; otherwise, executing step 9;
step 9, judging whether the calibration times are less than the set calibration wheel number N; if yes, adjusting one or more gain values in 4 gain values according to a calibration algorithm by the current target screen, adding 1 to the calibration times, and executing the step 4; otherwise, judging that the current target screen calibration fails and executing the step 10
Step 10, judging whether all the target screens are calibrated; if so, ending the calibration; otherwise, step 3 is executed.
Further, as shown in fig. 3 or fig. 4, as a preferred embodiment, the specific method for shooting the standard screen in step 2 or shooting the current target screen in step 4 includes:
a1, drawing a shooting calibration frame in the shooting display frame, and setting a central setting area in the shooting calibration frame;
A2, keeping the display screen in the shooting calibration frame and the frame of the display screen outside the central setting area during shooting;
a3, adjusting the shooting device to make the parallel deviation degree of the four edges of the display screen relative to the corresponding calibration frame edge less than a set value;
step a4, setting fixed parameters for the shooting device and acquiring a picture of a display screen in a focusing state.
Further, as shown in fig. 5, as a preferred embodiment, the method for calculating the RGB value of the center point on the picture of the display screen includes:
step b1, obtaining the coordinates of four vertexes of the frame of the display screen on the picture,
step b2, obtaining the coordinates of the central point of the display screen according to the four vertexes,
and b3, taking the average value of the RGB values of a plurality of pixel points at the center point of the picture display screen as the picture RGB value of the display screen.
Further, as a preferred embodiment, a plurality of pictures are taken, the RGB value of each picture is calculated, and then the average value of the RGB values of all the pictures is used as the RGB value corresponding to the display screen.
Further, as a preferred embodiment, in step 7, the allowable range of the difference value of the current target screen is set to R3G1B 3.
Further, as a preferred embodiment, in step 9, the value of the number N of calibration rounds is set to be an integer greater than 1.
Further, as a preferred embodiment, the value of the number N of calibration rounds is set to be not more than 30.
The invention can automatically adjust a plurality of display screens by shooting the acquired picture through the camera for image analysis and then through the set calibration flow and algorithm, so that the color temperature and the brightness of each display screen tend to be consistent. The method comprises the steps of acquiring a picture of a display screen, analyzing the acquired picture of the display screen according to an algorithm, collecting RGB (red, green and blue) values of a central point of the display screen on the picture, and designing a flow and an algorithm for automatically adjusting the color temperature and the brightness of the display screen according to the RGB values, wherein the environment greatly affects the shot picture, and various interference factors need to be eliminated. The invention obtains the RGB values (red, green and blue) of the pixel point in the central part of the image by shooting the image of the display screen, so that the consistency of the RGB values is achieved. The camera equipment and the processor adopted by the invention can be only a high-grade mobile phone, and the processing algorithm can be realized through APP programming without a professional sensor and a corresponding circuit board and processor for executing the algorithm.
It should be apparent that the embodiments described are some, but not all embodiments of the present application. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (7)
1. The method for correcting the color temperature and brightness consistency of a plurality of display screens is characterized by comprising the following steps: which comprises the following steps:
step 1, selecting a display screen as a standard screen, and other display screens as target screens, and acquiring 4 Gain values of the standard screen, wherein the 4 Gain values are R Gain, G Gain, B Gain and backlight respectively;
step 2, shooting the standard screen and obtaining the color RGB value of the central pixel point of the standard screen picture;
step 3, selecting an uncalibrated display screen from all the target screens as a current target screen, and acquiring 4 gain values of the current target screen;
step 4, shooting the current target screen and acquiring the color RGB value of a central pixel point of the current target screen picture;
step 5, judging whether the difference degree between the 4 gain values of the current target screen and the 4 gain values of the standard screen is in the maximum limit range; if yes, executing step 6; otherwise, synchronizing 4 gain values of the standard screen to the current target screen;
step 6, judging whether the fixed Gain value of the current target screen is the same as that of the standard screen or not, wherein the fixed Gain value represents the maximum item of the R Gain value, the G Gain value and the B Gain value; if yes, executing step 7; otherwise, synchronizing the fixed gain value of the standard screen to the current target screen;
Step 7, correspondingly calculating the difference value between the color RGB value of the current target screen and the color RGB value of the standard screen;
step 8, judging whether the difference value of the current target screen is within an allowable range; if yes, judging that the current target screen is successfully calibrated, and executing the step 10; otherwise, executing step 9;
step 9, judging whether the calibration times are less than a set calibration wheel number N, wherein N is an integer greater than 0; if yes, adjusting one or more gain values in 4 gain values according to a calibration algorithm by the current target screen, adding 1 to the calibration times, and executing the step 4; otherwise, judging that the current target screen calibration fails and executing the step 10
Step 10, judging whether all the target screens are calibrated; if so, ending the calibration; otherwise, step 3 is executed.
2. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 1, wherein: the specific method for shooting the standard screen in the step 2 or shooting the current target screen in the step 4 is as follows:
a1, drawing a shooting calibration frame in the shooting display frame, and setting a central setting area in the shooting calibration frame;
step a2, keeping the display screen in the shooting calibration frame and the frame of the display screen outside the central setting area during shooting;
A3, adjusting the shooting device to make the parallel deviation degree of the four edges of the display screen relative to the corresponding calibration frame edge less than a set value;
step a4, setting fixed parameters for the shooting device and acquiring a picture of a display screen in a focusing state.
3. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 2, wherein: the method for calculating the RGB value of the central point on the picture of the display screen comprises the following steps:
step b1, obtaining the coordinates of four vertexes of the frame of the display screen on the picture,
step b2, acquiring the coordinates of the central point of the display screen according to the four vertexes,
and b3, taking the average value of the RGB values of a plurality of pixel points at the center point of the picture display screen as the picture RGB value of the display screen.
4. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 3, wherein: and shooting a plurality of pictures, respectively calculating the RGB value of each picture, and taking the average value of the RGB values of all the pictures as the RGB value corresponding to the display screen.
5. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 1, wherein: in step 8, the allowable range of the difference value of the current target screen is set as the upper limit R3G1B 3.
6. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 1, wherein: in step 9, the value of the number N of calibration rounds is set to be an integer greater than 1.
7. The method for correcting color temperature and brightness uniformity of a plurality of display screens according to claim 6, wherein: and setting the value of the number N of the calibration wheels to be not more than 30.
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| CN101149894A (en) * | 2006-09-19 | 2008-03-26 | 采亦国际顾问有限公司 | Plane display capable of automatic correction for color characteristic and its method |
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