CN111093042B - White balance adjustment system and white balance adjustment method - Google Patents
White balance adjustment system and white balance adjustment method Download PDFInfo
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- CN111093042B CN111093042B CN201911372740.7A CN201911372740A CN111093042B CN 111093042 B CN111093042 B CN 111093042B CN 201911372740 A CN201911372740 A CN 201911372740A CN 111093042 B CN111093042 B CN 111093042B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
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- H—ELECTRICITY
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- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
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- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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Abstract
The application discloses white balance adjustment system and white balance adjustment method, including liquid crystal display panel, signal connection board, chronogenesis control panel, video conversion board, control processing apparatus and image acquisition device, wherein: the control processing device is used for specifically encoding first test image data corresponding to a test image and outputting a first video stream to the video conversion plate; the video conversion board is used for decoding the first video stream and outputting second test image data to the time sequence control board; the time sequence control board is used for driving the liquid crystal display panel to display a test image according to the second test image data; the liquid crystal display panel is used for displaying a test image; the image acquisition device is used for acquiring full gray scale data when the liquid crystal display panel displays a test image; and the control processing device is also used for carrying out white balance adjustment on the liquid crystal display panel according to the full gray scale data acquired by the image acquisition device.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a white balance adjustment system and a white balance adjustment method.
Background
In the field of white balance adjustment, the data bit width of test image data output by a display card of a control processing device such as a computer is generally 8 bits, and the data bit width of data in a time sequence control board is generally 10 bits; therefore, in order to drive the display panel to display the test image, the timing control board needs to perform data bit width conversion.
Most PC graphics card outputs have noise interference or chatter (diter) that can jitter up and down the current gray level. The shut-down flutter function is correspondingly complicated and different manufacturers are driven differently. Moreover, after the parameters of white balance are debugged, the parameters are manually burned into a timing control board (TCON), and then a test is performed to determine whether the parameters of white balance (WT) are correct, which wastes time and is not efficient. In the existing data bit width conversion technology, the data bit width is directly converted, 8-bit data is converted into 10-bit data, the upper 8bit of the 10-bit data is the original 8-bit data, and the lower 2-bit data is 00, for example, 10000000 is directly converted into 1000000000. However, when the 8-bit maximum gray scale 255(11111111) is converted, the conversion method can only convert the gray scale 1020(1111111100) into the 10-bit gray scale, which results in that the brightness corresponding to the 10-bit maximum gray scale 1023(1111111111) cannot be obtained, which results in low precision of the white balance test and further may cause the gamma curve of the optical test to have differences.
Therefore, the existing white balance adjusting technology has the technical problem that the brightness corresponding to the 10-bit full gray scale cannot be obtained by a data bit width direct conversion mode, so that the precision of testing white balance is not high, and needs to be improved.
Disclosure of Invention
The embodiment of the application provides a white balance adjustment system and a white balance adjustment method, which can realize measurement of 10-bit full gray scale white balance data by modifying computer software on the premise of not changing original white balance test hardware.
The embodiment of the application provides a white balance adjustment system, including liquid crystal display panel, signal connecting plate, time sequence control panel, video conversion board, control processing apparatus and image acquisition device, wherein: the control processing device is used for specifically encoding first test image data corresponding to a test image and outputting a first video stream to the video conversion plate; the video conversion board is used for decoding the first video stream and outputting second test image data to the time sequence control board, wherein the data bit width of the second test image data is greater than that of the first test image data; the time sequence control board is used for driving the liquid crystal display panel to display a test image according to the second test image data; the liquid crystal display panel is used for displaying a test image; the image acquisition device is used for acquiring full gray scale data when the liquid crystal display panel displays a test image; and the control processing device is also used for carrying out white balance adjustment on the liquid crystal display panel according to the full gray scale data acquired by the image acquisition device.
In some embodiments, the data bit width of the first test image data is 8 bits, and the data bit width of the first video stream and the second test image data is 10 bits.
In some embodiments, the particular encoding specifies:
the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; and the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits.
In some embodiments, the video conversion board is configured to perform histogram statistics on the data of the first video stream, and when a ratio of histogram statistics on any two of the red emitting pixels R, the green emitting pixels G, and the blue emitting pixels B exceeds 90%, the decoded video of the previous frame is displayed in a next frame drawing mode or the corresponding decoded video is output in a current frame drawing mode from the image data of the 4 th row of the first test image data.
In some embodiments, the image capture device is a CCD image sensor.
In some embodiments, the control processing device is configured to input a white balance value of a standard sample into the liquid crystal display panel, control the liquid crystal display panel to display a test image with different gray scales, obtain full gray scale data of the liquid crystal display panel, determine whether the obtained data is within a specification range, if so, enter a next process, otherwise, recalculate the white balance value according to a difference value between the obtained full gray scale data and the full gray scale data of the standard sample, input the calculated white balance value into the liquid crystal display panel, and readjust the white balance value.
The embodiment of the present application further provides a white balance adjustment method, where the method includes:
s10, the software of the control processing device encodes the first test image data corresponding to the test image into a first video stream through specific encoding, and outputs the first video stream to the video conversion board;
s20, the video conversion board performs histogram statistics on the first video stream respectively to obtain corresponding gray scale data corresponding to the red light-emitting pixel R, gray scale data corresponding to the green light-emitting pixel G, and gray scale data corresponding to the blue light-emitting pixel B, decodes the first video stream, converts the first video stream into second test image data supported by the timing control board, and outputs the second test image data to the timing control board, where a data bit width of the second test image data is greater than a data bit width of the first test image data;
s30, the timing control board drives the liquid crystal display panel to display a test image according to the second test image data;
s40, the liquid crystal display panel displays a test image;
s50, collecting full gray scale data of the liquid crystal display panel when the liquid crystal display panel displays the test image by an image collecting device;
and S60, the control processing device carries out white balance adjustment on the display panel according to the full gray scale data acquired by the image acquisition device.
In some embodiments, the data bit width of the first test image data is 8 bits, and the data bit width of the first video stream and the second test image data is 10 bits.
In some embodiments, in S10, the specific code specifies:
the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; and the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits.
In some embodiments, in S20, when the histogram statistics ratio of any two of the red emitting pixels R, the green emitting pixels G, and the blue emitting pixels B exceeds 90%, starting from the 4 th line image data of the first test image data, the decoded video of the previous frame is displayed in the next frame or the corresponding decoded video is output to the timing control board in the current frame.
In the white balance adjustment system and the white balance adjustment method provided by the embodiment of the application, the video conversion board decodes the image data coded by the software of the control processing device into the test image data supported by the time sequence control board, and outputs the test image data to the time sequence control board, so that the measurement of the full gray scale white balance data can be realized.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a white balance adjustment system according to an embodiment of the present invention.
Fig. 2 is a flowchart of a white balance adjustment method according to an embodiment of the present invention.
Detailed Description
The technical solutions in 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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The technical problem that the testing white balance precision is not high due to the fact that the brightness corresponding to the 10-bit full gray scale cannot be obtained through a data bit width direct conversion mode in the existing white balance adjusting technology can be solved.
In one embodiment, as shown in fig. 1, a white balance adjustment system according to an embodiment of the present invention includes a display panel 11, a signal connection board 12, a timing control board 13, a video conversion board 14, a control processing device 15, and an image capturing device 16.
Specifically, the control processing device 15 is a general home computer. The control processing device 15 is configured to perform specific encoding on first test image data corresponding to a test image, and output a first video stream to the video conversion board 14; the test image may be a single image or a plurality of images, for example, 256 images.
Specifically, the video converter board 14 is configured to process the first video stream output from the control processing device 15, decode the first video stream, and output second test image data to the timing control board 13, where a data bit width of the second test image data is greater than a data bit width of the first test image data.
Specifically, the timing control board 13 is configured to drive the liquid crystal display panel 11 to display a test image according to the second test image data; specifically, the timing control board 13 is configured to convert the control signals DE, HS, and VS received by the input interface into control signals recognizable by the data driving circuit and the scan driving circuit, and to drive the liquid crystal display panel to display a test image through the signal connection board 12 according to the second test image data.
In particular, the signal connection board 12 is used for coupling or adjusting a video signal.
Specifically, the liquid crystal display panel 11 is used to display a test image.
Specifically, the image acquisition device 16 is configured to acquire full grayscale data when the liquid crystal display panel 11 displays a test image; as shown in fig. 1, the image capture device 16 includes a test light probe 161 and an optical test instrument 162.
Specifically, the control processing device 15 is further configured to perform white balance adjustment on the liquid crystal display panel according to the full grayscale data acquired by the image acquisition device 16.
In this embodiment, a video converter decodes image data encoded by software of a control processing device into test image data supported by a timing control board, and outputs the test image data to the timing control board, so as to measure full gray-scale white balance data.
Preferably, the data bit width of the first test image data is 8 bits, and the data bit width of the first video stream and the data bit width of the second test image data are 10 bits.
Preferably, the specific coding specifies: the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; and the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits.
Preferably, the video conversion board 14 is configured to perform histogram statistics on the data of the first video stream, and when a ratio of histogram statistics on any two of the red emitting pixels R, the green emitting pixels G, and the blue emitting pixels B exceeds 90%, the decoded video of the previous frame is displayed in the next frame or the corresponding decoded video is output in the current frame, starting from the image data of the 4 th line of the first test image data.
Preferably, the image capturing Device 16 is a Charge Coupled Device (CCD) image sensor. The CCD image sensor can directly convert the optical image into a digital signal, so that the acquired image can be conveniently processed subsequently.
Preferably, the control processing device 16 is configured to input a white balance value of a standard sample into the liquid crystal display panel, control the liquid crystal display panel 11 to display a test image with different gray scales, acquire full gray scale data of the liquid crystal display panel 11, determine whether the acquired data is within a specification range, if so, enter a next process, otherwise, recalculate the white balance value according to a difference value between the acquired full gray scale data and the full gray scale data of the standard sample, input the calculated white balance value into the liquid crystal display panel, and readjust the white balance value.
Preferably, the full gray scale data is a white field chromaticity coordinate value and a gamma value at the full gray scale. For example, the test image is a circular image including 256 sectors, wherein the 256 sectors display different gray scale images from black to white. The image acquisition device 16 is used for acquiring the brightness and the chromaticity of the liquid crystal display panel 11 when the test image is displayed, so that the brightness value and the chromaticity coordinate value under 256 different gray levels can be obtained, the change curve of the white field chromaticity coordinate value and the gamma along with the gray level can be obtained in a fitting mode, and further the white field chromaticity coordinate value and the gamma value of the liquid crystal display panel 11 under the full gray level can be obtained, so that a large amount of time can be saved in data acquisition.
Preferably, the number of gray levels in the test image corresponds to a data bit width of the first test image data.
Preferably, the specification range of the white field chromaticity coordinate is within ± 0.3% of the white field chromaticity coordinate value of the standard sample from the white field chromaticity coordinate value of the standard sample; the standard range of gamma values is such that the difference between the gamma values of the standard sample is between (-0.1, + 0.1).
The embodiment of the application also provides a white balance adjusting method. As shown in fig. 2, a flowchart of a white balance adjustment method provided in the embodiment of the present application includes the following steps:
s10, the software of the control processing device encodes the first test image data corresponding to the test image into a first video stream through specific encoding, and outputs the first video stream to the video conversion board;
s20, the video conversion board performs histogram statistics on the first video stream respectively to obtain corresponding gray scale data corresponding to the red light-emitting pixel R, gray scale data corresponding to the green light-emitting pixel G, and gray scale data corresponding to the blue light-emitting pixel B, decodes the first video stream, converts the first video stream into second test image data supported by the timing control board, and outputs the second test image data to the timing control board, where a data bit width of the second test image data is greater than a data bit width of the first test image data;
s30, the timing control board drives the liquid crystal display panel to display a test image according to the second test image data;
s40, the liquid crystal display panel displays a test image;
s50, collecting full gray scale data of the liquid crystal display panel when the liquid crystal display panel displays the test image by an image collecting device;
and S60, the control processing device carries out white balance adjustment on the display panel according to the full gray scale data acquired by the image acquisition device.
In the white balance adjustment method provided in this embodiment, the software controlling the processing device encodes the first test image data corresponding to the test image into the first video stream through a specific encoding, and outputs the first video stream to the video converter board.
And when the histogram statistics of any two of the red luminous pixel R, the green luminous pixel G and the blue luminous pixel B exceeds more than 90%, starting from the 4 th row image data of the first test image data, displaying the decoded video of the previous frame in the next frame drawing mode or outputting the corresponding decoded video in the current frame.
And the video conversion board converts the first video stream into second test image data supported by the time sequence control board after decoding, and outputs the second test image data to the time sequence control board, wherein the data bit width of the second test image data is greater than that of the first test image data.
According to the white balance adjusting method provided by the embodiment of the application, on the premise that original hardware is not changed, software in the control processing device is modified, so that 10-bit full gray scale white balance data can be measured, automatic white balance testing is further realized, partial values of high gray scale gamma curves are reduced, and product output is accelerated.
Preferably, the data bit width of the first test image data is 8 bits, and the data bit width of the first video stream and the data bit width of the second test image data are 10 bits.
Preferably, the specific coding specifies: the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; and the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits.
Preferably, the video conversion board 14 is configured to perform histogram statistics on the data of the first video stream, and when a ratio of histogram statistics on any two of the red emitting pixels R, the green emitting pixels G, and the blue emitting pixels B exceeds 90%, the decoded video of the previous frame is displayed in the next frame or the corresponding decoded video is output in the current frame, starting from the image data of the 4 th line of the first test image data.
Preferably, the image capturing Device 16 is a Charge Coupled Device (CCD) image sensor. The CCD image sensor can directly convert the optical image into a digital signal, so that the acquired image can be conveniently processed subsequently.
Preferably, the control processing device 16 is configured to input a white balance value of a standard sample into the liquid crystal display panel, control the liquid crystal display panel 11 to display a test image with different gray scales, acquire full gray scale data of the liquid crystal display panel 11, determine whether the acquired data is within a specification range, if so, enter a next process, otherwise, recalculate the white balance value according to a difference value between the acquired full gray scale data and the full gray scale data of the standard sample, input the calculated white balance value into the liquid crystal display panel, and readjust the white balance value.
Preferably, the full gray scale data is a white field chromaticity coordinate value and a gamma value at the full gray scale. For example, the test image is a circular image including 256 sectors, wherein the 256 sectors display different gray scale images from black to white. The image acquisition device 16 is used for acquiring the brightness and the chromaticity of the liquid crystal display panel 11 when the test image is displayed, so that the brightness value and the chromaticity coordinate value under 256 different gray levels can be obtained, the change curve of the white field chromaticity coordinate value and the gamma along with the gray level can be obtained in a fitting mode, and further the white field chromaticity coordinate value and the gamma value of the liquid crystal display panel 11 under the full gray level can be obtained, so that a large amount of time can be saved in data acquisition.
Preferably, the number of gray levels in the test image corresponds to a data bit width of the first test image data.
Preferably, the specification range of the white field chromaticity coordinate is within ± 0.3% of the white field chromaticity coordinate value of the standard sample from the white field chromaticity coordinate value of the standard sample; the standard range of gamma values is such that the difference between the gamma values of the standard sample is between (-0.1, + 0.1).
In the white balance adjustment system provided by the embodiment of the application, the video conversion board decodes the image data coded by the software of the control processing device into the test image data supported by the time sequence control board, and outputs the test image data to the time sequence control board, so that the measurement of full gray scale white balance data can be realized.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing detailed description is directed to a white balance adjustment system provided in an embodiment of the present application, and a specific example is applied in the detailed description to explain the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (6)
1. The white balance adjusting system is characterized by comprising a liquid crystal display panel, a signal connecting plate, a time sequence control plate, a video conversion plate, a control processing device and an image acquisition device, wherein:
the control processing device is used for specifically encoding first test image data corresponding to a test image and outputting a first video stream to the video conversion board, wherein the specific encoding specifies that: the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits;
the video conversion board respectively carries out histogram statistics on the first video stream to obtain corresponding gray scale data corresponding to the red light-emitting pixel R, gray scale data corresponding to the green light-emitting pixel G and gray scale data corresponding to the blue light-emitting pixel B, the first video stream is converted into second test image data supported by the time sequence control board after decoding, and outputting to a timing control board, wherein the data bit width of the second test image data is greater than the data bit width of the first test image data, wherein when the histogram statistics ratio of any two of the red emitting pixel R, the green emitting pixel G and the blue emitting pixel B exceeds 90%, starting from the 4 th line image data of the first test image data, displaying a decoded video of a previous frame on a picture of a next frame or outputting a corresponding decoded video on a current frame;
the time sequence control board is used for driving the liquid crystal display panel to display a test image according to the second test image data;
the liquid crystal display panel is used for displaying a test image;
the image acquisition device is used for acquiring full gray scale data when the liquid crystal display panel displays a test image; and the control processing device is also used for carrying out white balance adjustment on the liquid crystal display panel according to the full gray scale data acquired by the image acquisition device.
2. The white balance adjustment system according to claim 1, wherein a data bit width of the first test image data is 8 bits, and a data bit width of the first video stream and the second test image data is 10 bits.
3. The white balance adjustment system according to claim 1, wherein the image acquisition device is a CCD image sensor.
4. The white balance adjustment system according to claim 1, wherein the control processing device is configured to input a white balance value of a standard sample into the liquid crystal display panel, control the liquid crystal display panel to display a test image with different gray scales, acquire full gray scale data of the liquid crystal display panel, determine whether the acquired data is within a specification range, if so, enter a next process, otherwise, recalculate the white balance value according to a difference value between the acquired full gray scale data and the full gray scale data of the standard sample, input the calculated white balance value into the liquid crystal display panel, and readjust the white balance value.
5. A white balance adjustment method, characterized in that the method comprises:
s10, the software controlling the processing device encodes the first test image data corresponding to the test image into a first video stream via a specific encoding, and outputs the first video stream to the video conversion board, wherein the specific encoding specifies: the 1 st line image data of the first test image data is set as a red light-emitting pixel R with a data bit width of 10 bits; the 2 nd line image data of the first test image data is set as a green light-emitting pixel G with a data bit width of 10 bits; the 3 rd line image data of the first test image data is set as a blue light-emitting pixel B with a data bit width of 10 bits;
s20, the video conversion board respectively makes histogram statistics on the first video stream to obtain corresponding gray scale data corresponding to red emitting pixel R, green emitting pixel G and blue emitting pixel B, decodes the gray scale data to convert the first video stream into second test image data supported by the timing control board, and outputting to the timing control board, wherein the data bit width of the second test image data is greater than the data bit width of the first test image data, wherein when the histogram statistics ratio of any two of the red emitting pixel R, the green emitting pixel G and the blue emitting pixel B exceeds 90%, starting from the 4 th line image data of the first test image data, displaying a decoded video of a previous frame on a picture of a next frame or outputting a corresponding decoded video to the time sequence control board on a current frame;
s30, the timing control board drives the liquid crystal display panel to display the test image according to the second test image data;
s40, the liquid crystal display panel displays a test image;
s50, collecting full gray scale data of the liquid crystal display panel when the liquid crystal display panel displays the test image by an image collecting device;
and S60, the control processing device carries out white balance adjustment on the display panel according to the full gray scale data acquired by the image acquisition device.
6. The white balance adjustment method according to claim 5, wherein a data bit width of the first test image data is 8 bits, and a data bit width of the first video stream and the second test image data is 10 bits.
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