CN108389234B - Flat LCD (liquid Crystal display) heterochromatic detection method, storage device and mobile terminal - Google Patents
Flat LCD (liquid Crystal display) heterochromatic detection method, storage device and mobile terminal Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims description 8
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- 238000004590 computer program Methods 0.000 claims description 12
- 238000003384 imaging method Methods 0.000 claims description 4
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- 241001268993 Heterochrosis Species 0.000 abstract description 3
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- 238000009125 cardiac resynchronization therapy Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
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Abstract
The invention discloses a method for detecting the different color of a flat-panel LCD, a storage device and a mobile terminal. The method comprises the following steps: generating a 256 × 256 color statistical table for counting the times of the same color in all the pixel points; generating a color lookup table of 256 × 256 in the color statistical table, comparing and filtering the colors counted in the color statistical table with a set threshold value, and recording the colors in the color lookup table; and generating a binary picture by each pixel point in the image according to the result inquired in the color lookup table. The color lookup table is simple in arrangement, simple and easy to operate and high in starting speed; the recognition efficiency of the heterochrosis is higher, and the inherent color characteristics of the screen are expressed by adopting a method for calculating a screen color statistical table, so that the color model is the largest and close to the collection of the colors; the running time is shortened, and the calculation speed is faster than the threshold value searching speed due to the adoption of the method of directly searching colors in the color searching table.
Description
Technical Field
The invention relates to the field of LCD (liquid crystal display) different color detection, in particular to a flat panel LCD different color detection method, a storage device and a mobile terminal.
Background
LCD (short for Liquid Crystal Display) Liquid Crystal Display.
The LCD is constructed by placing liquid crystal cells between two parallel glass substrates, arranging TFT (thin film transistor) on the lower substrate glass, arranging color filter on the upper substrate glass, and controlling the rotation direction of liquid crystal molecules by changing the signal and voltage on the TFT, so as to control whether polarized light of each pixel point is emitted or not to achieve the purpose of display.
Now, LCDs have become the mainstream of replacements for CRTs, and the price has also dropped a lot and has become sufficiently popular.
In the existing algorithm technology for detecting the different colors of the flat-panel LCD screen, red, green and blue are firstly displayed on the screen, then a camera captures an image, and the captured image is subjected to color analysis, so that whether the different colors exist is judged. The range threshold of the RGB colors is set manually or semi-automatically, all colors which are not within the threshold are judged to be unqualified, and the colors in the original color set are judged to be qualified. The prior art has some obvious disadvantages: 1, setting the color threshold value is troublesome, and the color parameter model needs to be modified manually and continuously. The model for the 2 color threshold setting is relatively extensive and does not accurately characterize the color of the LCD screen. The 3-color thresholding algorithm will be slow and require repeated comparisons at each point.
Therefore, a method for rapidly detecting the color difference of the flat panel LCD is needed in the market.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for detecting the different color of a flat-panel LCD, a storage device and a mobile terminal.
The technical scheme adopted by the invention to achieve the technical purpose is as follows: a method for detecting a color cast of a flat panel LCD, the method comprising:
generating a 256 × 256 color statistical table for counting the times of the same color in all the pixel points;
generating a color lookup table of 256 × 256 in the color statistical table, comparing and filtering the colors counted in the color statistical table with a set threshold value, and recording the colors in the color lookup table;
and generating a binary picture by each pixel point in the image according to the result inquired in the color lookup table.
In some embodiments, the color points within the color statistics are expanded to form a bead.
In some embodiments, the spherical radius of the color point
R0, G0, B0 denote RGB values of statistically normal points, and R, G, B denotes points in the center of the sphere.
In some embodiments, the method further comprises:
and filtering out the miscellaneous points in the picture after the binary picture is generated.
In some embodiments, the Index formula Index of the color statistics table corresponding to R, G, B for each color in the picture is Index = R < <16+ G < <8+ B, and if the corresponding color appears once, the color statistics in the corresponding Index is increased by 1.
In some embodiments, the colors in the color statistics table are compared to a set threshold, and statistical colors below the threshold are all set to 0 in the color lookup table, and colors above the threshold are all set to 1 in the color lookup table.
In some embodiments, each color point in the picture is corresponding to an index in the color lookup table, and is directly queried in the color lookup table through the index, when the query result is 1, the point is set to be 1, and when the query result is 0, the point is set to be 0, so as to generate a binarized image.
In some embodiments, after generating the binarized picture, filtering out the outliers in the picture specifically includes: counting the number of white points in the window through one window, and if the number of the white points in the window is lower than a specified threshold value, determining that the white points are interference points of image imaging and removing the interference points; otherwise, the points of the original image are retained.
The present invention also proposes a storage device storing a computer program that can be executed to implement the above-mentioned method for detecting the heterochromatic color of the flat panel LCD.
The invention also provides a mobile terminal, comprising: the device comprises a processor and a memory which is in communication connection with the processor, wherein the memory stores a computer program, and the computer program realizes the method for detecting the different colors of the flat panel LCD when being executed by the processor;
the processor is used for calling the computer program in the memory to execute the flat-panel LCD different color detection method.
The invention has the beneficial effects that: compared with the prior art, the invention has the following advantages: the color lookup table is simple to set, simple and easy to operate and high in starting speed; the recognition efficiency of the heterochrosis is higher, and the inherent color characteristics of the screen are expressed by adopting a method for calculating a screen color statistical table, so that the color model is the largest and close to the collection of the colors; the running time is shortened, and the calculation speed is faster than the threshold value searching speed due to the adoption of the method of directly searching colors in the color searching table.
Drawings
FIG. 1 is a flow chart of a method for detecting the color difference of a flat panel LCD according to the present invention;
FIG. 2 is a schematic diagram of generating a color statistical table according to the method for detecting different colors of a flat panel LCD;
FIG. 3 is a schematic diagram of a color look-up table generated by a color statistic table in the method for detecting the different colors of a flat panel LCD according to the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 3, the present invention provides a method for detecting a color difference of a flat panel LCD, the method comprising:
generating a 256 × 256 color statistical table 10 for counting the times of the same color in all the pixel points;
generating a color lookup table 20 of 256 × 256 in the color statistical table 10, comparing and filtering the color counted in the color statistical table 10 with a set threshold, and recording the color in the color lookup table 20;
and each pixel point in the image generates a binary image according to the result inquired in the color lookup table 20.
Specifically, a color statistical table 10 of 256 × 256 is generated first, then each pixel in the image is counted, for example, the RGB value of the first pixel in the image is 255,0,0, and then it is counted as 1 at the corresponding point in the color statistical table 10, when the point appears for the second time, it is counted as 2 at the corresponding point in the color statistical table 10, and so on, the number of occurrences of all pixels in the image is counted in the color statistical table 10 according to the RGB value of the color of the pixel, and a color statistical table 10 for all pixels in the image is formed.
After the table is generated, according to different settings for the color critical threshold in different images, taking the critical threshold as an example, a pixel greater than or equal to the threshold is marked as 1, a pixel smaller than the threshold is marked as 0, and a color lookup table 20 is formed according to the color statistical table 10 and the critical threshold.
After the color lookup table 20 is generated, querying each speed limit point in the image in the color lookup table 20, for example, querying that one point in the image is 1 in the color lookup table, i.e., 1 in the binarized image, querying that one point in the image is 0 in the color lookup table, i.e., 0 in the binarized image, and converting the image into the binarized image according to different query results.
In some embodiments, the color points within the color statistics table 10 are expanded to form a bead.
In some embodiments, the spherical radius of the color point
R0, G0, B0 denote RGB values of statistically normal points, and R, G, B denotes points in the center of the sphere.
Specifically, since there are not many points appearing inside the color set model in the statistical table, there is a possibility that points around the normal color are not added. The model thus established is very good False alarms are easily generated. A dilation of the statistical pixels inside the color must be performed. The specific method comprises the following steps: to the current color point, expand a small ball into the system. As shown in fig. 3. Specific formula
d represents the sphere radius, R0, G0, B0, and represents the RGB values of the statistical normal points. R, G, B represent points within the center of the sphere. The statistical table thus processed is finally set with a threshold. All points larger than this threshold are set to 1 in the corresponding look-up table indicating normal. Points smaller than this threshold are set to 0 in the look-up table.
In some embodiments, the method further comprises:
and filtering out the miscellaneous points in the picture after the binary picture is generated.
In some embodiments R, G, B for each color in the picture corresponds to the Index of color statistics table 10, Index formula Index = R < <16+ G < <8+ B, and if the corresponding color appears once, the color statistics in the corresponding Index is incremented by 1.
In some embodiments, the colors in the color statistics table 10 are compared to a set threshold, and statistical colors below the threshold are all set to 0 in the color lookup table 20, and colors above the threshold are all set to 1 in the color lookup table 20.
In some embodiments, each color point in the picture is mapped to an index in the color lookup table 20, and is directly queried in the color lookup table 20 through the index, and when the query result is 1, the point is set to 1, and when the query result is 0, the point is set to 0, so as to generate a binarized image.
In some embodiments, after generating the binarized picture, filtering out the outliers in the picture specifically includes: counting the number of white points in the window through one window, and if the number of the white points in the window is lower than a specified threshold value, determining that the white points are interference points of image imaging and removing the interference points; otherwise, the points of the original image are retained.
Specifically, the method filters out the miscellaneous points in the image. In the actual image acquisition process, dark and fine dots appear in the image due to dust and the like. Very small speckles will appear in the resulting binarized image. Since the noise point is not generated by the screen itself, the false detection may be brought about in practice. A filter module is added. The specific method is to count the number of white points in a window through one window, if the number is lower than a specified threshold value, the white points are considered to be interference points due to image imaging, and if the number is not higher than the specified threshold value, the white points are removed, otherwise, the white points of the original image are reserved.
The present invention also proposes a storage device storing a computer program that can be executed to implement the above-mentioned method for detecting the heterochromatic color of the flat panel LCD.
The invention also provides a mobile terminal, comprising: the device comprises a processor and a memory which is in communication connection with the processor, wherein the memory stores a computer program, and the computer program realizes the method for detecting the different colors of the flat panel LCD when being executed by the processor;
The processor is used for calling the computer program in the memory to execute the flat-panel LCD different color detection method.
In summary, the color lookup table 20 of the present invention is simple in setting, simple and easy to operate, and fast in operation; the recognition efficiency of the heterochrosis is higher, and because the inherent color characteristics of the screen are expressed by adopting the method of calculating the screen color statistical table 10, the maximum color-near set on the color model is obtained; the running time becomes short and the calculation speed is faster than the threshold value search speed because the method of directly searching colors in the color lookup table 20 is adopted.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A method for detecting the color difference of a flat-panel LCD is characterized by comprising the following steps:
generating a 256 × 256 color statistical table for counting the times of the same color in all the pixel points;
Generating a color lookup table of 256 × 256 in the color statistical table, comparing and filtering the colors counted in the color statistical table with a set threshold, recording the colors in the color lookup table, setting all the statistical colors lower than the threshold to be 0 in the color lookup table, and setting all the colors higher than the threshold to be 1 in the color lookup table;
and generating a binary image by each pixel point in the image according to the result inquired in the color lookup table.
2. The method of claim 1, wherein the color dots inside the color statistics table are expanded to form a small sphere.
3. The method of claim 2, wherein the spherical radius of the color dots is larger than the spherical radius of the color dots
R0, G0, B0 denote RGB values of statistically normal points, and R, G, B denotes points in the center of the sphere.
4. The method of detecting the color difference of the flat panel LCD according to claim 3, further comprising:
and filtering out the miscellaneous points in the picture after the binary picture is generated.
5. The method as claimed in any one of claims 1 to 4, wherein the Index of the color statistics table corresponding to R, G, B for each color in the picture is indexed by the formula Index = R < <16+ G < <8+ B, and if the corresponding color appears once, the color statistics in the corresponding Index is increased by 1.
6. The method as claimed in any one of claims 1-4, wherein each color point in the picture is mapped to an index in the color lookup table, and directly queried in the color lookup table by the index, and when the query result is 1, the point is set to 1, and when the query result is 0, the point is set to 0, thereby generating a binarized image.
7. The method for detecting the color cast of the flat-panel LCD according to claim 4, wherein the filtering of the noise points in the picture after the binary picture is generated specifically comprises: counting the number of white points in a window through a window, and if the number of the white points in the window is lower than a specified threshold, considering the white points as interference points of image imaging and removing the interference points; otherwise, the points of the original image are retained.
8. A storage device, wherein the storage device stores a computer program, the computer program being executable to implement the method for detecting a color cast in a flat panel LCD according to any one of claims 1 to 7.
9. A mobile terminal, comprising: a processor, a memory communicatively coupled to the processor, the memory storing a computer program that, when executed by the processor, implements the flat panel LCD metamerism detection method of any of claims 1-7;
The processor is used for calling a computer program in the memory to execute the method for detecting the color difference of the flat panel LCD according to any one of the claims 1-7.
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