CN112085805B - Ink color screening and classifying method for LED display module - Google Patents
Ink color screening and classifying method for LED display module Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a screening and classifying method for ink colors of an LED display module, which comprises the following steps: fixing the camera, the light source and the LED display module in a mode that the centers of the camera, the light source and the LED display module are arranged in sequence and are on the same straight line, and enabling the intersection point of the diagonal lines of the LED display module to coincide with the normal line of the optical axes of the light source and the camera lens; sequentially irradiating the LED display module with light of different colors, photographing the LED display module by using a camera, and recording gray data of each pixel point on the photograph; calculating average gray values of photos corresponding to the colors of the LED display modules; and classifying the LED display modules with average gray values of photos corresponding to various colors within a set threshold range into the same class, thereby completing the classification of the LED display modules. The invention can rapidly and accurately screen and classify the ink colors of the LED display modules, thereby ensuring the consistency of the ink colors of the LED display screen spliced by the LED display modules.
Description
Technical Field
The invention belongs to the technical field of screening and classifying of ink colors of LED display modules, and relates to a screening and classifying method of ink colors of LED display modules.
Background
At present, the ink color of the LED display module is deviated due to the deviation of the color of the PCB, a film or other processes, so that the ink color of the LED display module is required to be screened and classified to ensure that the ink color of the same display screen is the same, and the screening and classifying method in the current industry is also used for screening and classifying the ink color of the LED display module in a specific place in a manner of depending on human eyes, and the color resolution capability of the LED display module is screened and classified by the human eyes. The method for screening and classifying the ink colors of the led display module by using human eyes has poor consistency and low efficiency.
For a flat display screen, the purpose of the ink screening classification is to make all led display modules of the same class ink the same. When the led module ink is screened and classified by human eyes, the screening classification among different operators cannot be ensured to be the same because the degree of perception of the color among people is deviated, so that the final screening classification result is inevitably influenced.
Disclosure of Invention
The invention aims to provide the LED display module ink color screening and classifying method which can show the ink color grade of each LED module very finely and has high screening and classifying efficiency.
In order to solve the technical problems, the method for screening and classifying the ink colors of the LED display module comprises the following steps:
fixing the camera, the light source and the LED display module in a mode of arranging the camera, the light source and the LED display module in sequence, and ensuring that the center of a camera lens, the center of the light source and the center of the LED display module are on the same straight line, wherein the intersection point of the diagonal lines of the LED display module and the central axis of the light source coincide with the normal line of the optical axis of the camera lens; wherein the camera adopts a black-and-white camera, and the light source comprises led lamp beads with at least 8 colors;
step two: switching the colors of the light sources to sequentially emit light with various colors to irradiate the LED display module, photographing the LED display module by using a camera, and recording gray data of each pixel point on the photograph;
step three: calculating average gray values of photos corresponding to the colors of the LED display module according to the formula (1);
p k represents the average gray value, a, of a photograph taken when the LED display module is illuminated with the kth color ij-k Representing the gray value of the ith row and jth column pixels in the pixel matrix on the photo, wherein m and n respectively represent the row number and the column number of the pixels in the pixel matrix;
step four: similarly, obtaining average gray values of the photos corresponding to the LED display modules under the irradiation of each color light according to the steps;
step five: setting a photo average gray value threshold range corresponding to each color, and classifying the LED display modules with photo average gray values within the set threshold ranges corresponding to the colors into the same class to finish the classification of the LED display modules.
The LED lamp beads of each color are uniformly distributed in the light source.
The LED lamp beads of each color are uniformly distributed in the light source in a divided area.
The camera adopts an 8bit CMOS black-and-white camera.
The camera adopts a 10bit CMOS black-and-white camera.
The light source adopts an annular light source.
The combined polygonal light source.
The semicircular combined light source.
The light source comprises LED lamp beads with 8 colors of yellow light, red light, light red light, infrared light, purple light, blue light, green light and white light.
The invention can rapidly and accurately screen and classify the ink colors of the LED display modules, thereby ensuring the consistency of the ink colors of the LED display screen spliced by the LED display modules.
According to the invention, the LED display module images are lighted and collected by a plurality of light sources, so that the LED display module images can be very finely classified according to the gray average value of the images, and compared with the traditional method for screening and classifying the ink colors of the LED display module by human eyes, the method improves the screening and classifying efficiency and the screening and classifying effect of the ink colors of the LED display module, and can ensure the consistency of the screening and classifying results of the ink colors.
Drawings
Fig. 1 is a schematic diagram of a relative positional relationship among a camera, a light source and an LED display module according to the present invention.
FIG. 2 is a cut-away view of a light source.
Fig. 3 is a schematic view of an annular light source.
FIG. 4 is a schematic diagram of a combined polygonal light source.
Fig. 5 is a schematic view of a semicircular combined light source.
Detailed Description
As shown in FIG. 1, the method for screening and classifying the ink colors of the LED display module comprises the following steps:
step one, fixing according to the modes of the camera, the intermediate light source and the LED module, and ensuring that the center of the camera lens, the center of the light source and the center of the LED display module are on the same straight line, wherein the intersection point of the diagonal lines of the LED display module and the central axis of the light source coincide with the normal line of the optical axis of the camera lens. Finally, adjusting the brightness of the light source and the focal length of the aperture of the camera to ensure that the acquired image is clear and has no saturated pixel points;
the camera adopts an 8-bit CMOS black-and-white camera, the light source adopts an annular light source, the light source contains LED high-density lamp beads of 8 wavelengths of yellow light, red light, light red light, infrared light, purple light, blue light, green light and white light, and each color contains a plurality of LED high-density lamp beads; the LED high-density lamp beads of each color can be uniformly distributed in the light source, and can be uniformly distributed in the light source in a region; the LED display module adopts a standard flawless LED display module;
step two: switching the colors of the light sources to sequentially emit yellow light, red light, light red light, infrared light, purple light, blue light, green light and white light, photographing the LED display module by using a camera, and recording the gray data of each pixel point on the photo until all the colors are switched and photographed;
step three: calculating average gray values of photos corresponding to the colors of the LED display module according to the formula (1);
p k representing the average gray value, a, of a matrix of photo pixels acquired when the LED display module is illuminated with the kth color LED high density light beads ij-k Representing the gray value of the pixel in the ith row and the jth column of the pixel matrix, wherein m and n respectively represent the row number and the column number of the pixel in the pixel matrix;
step four: similarly, the average gray value of the corresponding photo when the LED display module is irradiated by 8 colors of light can be obtained according to the steps;
step five: setting an average gray value threshold range corresponding to each color, screening and classifying the LED display modules according to the average gray value of the photo corresponding to each color, and classifying the LED display modules with the average gray values corresponding to the colors in the set threshold range into the same class to finish the classification of the LED display modules.
For example, the LED display modules with the average gray value corresponding to yellow light in the threshold range 66-70, the average gray value corresponding to red light in the threshold range 71-75, the average gray value corresponding to light red in the threshold range 72-76, the average gray value corresponding to infrared light in the threshold range 37-40, the average gray value corresponding to purple light in the threshold range 70-74, the average gray value corresponding to blue light in the threshold range 58-62, the average gray value corresponding to green light in the threshold range 62-65 and the average gray value corresponding to white light in the threshold range 60-64 are classified into the same type, and the LED display screen can be formed by splicing the LED display modules of the same type.
The invention is not limited to the above embodiment, and the camera may also adopt a 10bit black-and-white camera or a black-and-white camera with higher gray level; the light source can also adopt a combined polygonal light source shown in fig. 4, a semicircular combined light source shown in fig. 5 and the like, so long as the light source can be ensured to irradiate at all angles and the problem of irradiation shadow can be avoided; the light source can also comprise 9-color LED high-density lamp beads or 10-color LED high-density lamp beads and the like, the more the color types are, the smaller the threshold range is, the finer the classification of the LED display modules is, and the better the consistency of ink colors of the LED display screens spliced by the same type of LED display modules is.
Claims (9)
1. The method for screening and classifying the ink colors of the LED display modules is characterized by comprising the following steps of:
fixing the camera, the light source and the LED display module in a mode of arranging the camera, the light source and the LED display module in sequence, and ensuring that the center of a camera lens, the center of the light source and the center of the LED display module are on the same straight line, wherein the intersection point of the diagonal lines of the LED display module and the central axis of the light source coincide with the normal line of the optical axis of the camera lens; wherein the camera adopts a black-and-white camera, and the light source comprises led lamp beads with at least 8 colors;
step two: switching the colors of the light sources to sequentially emit light with various colors to irradiate the LED display module, photographing the LED display module by using a camera, and recording gray data of each pixel point on the photograph;
step three: calculating average gray values of photos corresponding to the colors of the LED display module according to the formula (1);
p k represents the average gray value, a, of a photograph taken when the LED display module is illuminated with the kth color ij-k Representing the gray value of the ith row and jth column pixels in the pixel matrix on the photo, wherein m and n respectively represent the row number and the column number of the pixels in the pixel matrix;
step four: similarly, obtaining average gray values of the photos corresponding to the LED display modules under the irradiation of each color light according to the steps;
step five: setting a photo average gray value threshold range corresponding to each color, and classifying the LED display modules with photo average gray values within the set threshold ranges corresponding to the colors into the same class to finish the classification of the LED display modules.
2. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the LED lamp beads of each color are uniformly distributed in the light source.
3. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the LED lamp beads of each color are uniformly distributed in the light source in the divided areas.
4. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the camera is an 8-bit CMOS black-and-white camera.
5. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the camera is a 10-bit CMOS black-and-white camera.
6. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the light source is a ring light source.
7. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the light source is a combined polygonal light source.
8. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the light source is a semicircular combined light source.
9. The method for screening and classifying ink colors of an LED display module according to claim 1, wherein the light source comprises LED lamp beads with 8 colors of yellow light, red light, light red light, infrared light, purple light, blue light, green light and white light.
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| CN112802133B (en) * | 2021-04-13 | 2021-07-06 | 武汉精测电子集团股份有限公司 | Mini Led display screen unit plate ink color detection and sorting method based on machine vision |
| CN113546874B (en) * | 2021-07-15 | 2023-04-11 | 厦门强力巨彩光电科技有限公司 | SMT PCB ink color classification method |
| CN113695267B (en) * | 2021-08-30 | 2023-05-26 | 深圳市洲明科技股份有限公司 | Ink color sorting device and sorting method thereof |
| CN114308735B (en) * | 2021-12-30 | 2024-05-10 | 西安诺瓦星云科技股份有限公司 | Ink color detection and sorting method, system and equipment for display module |
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| CN110024020A (en) * | 2016-11-23 | 2019-07-16 | 三星电子株式会社 | Display device, calibrating installation and its calibration method |
| CN110322830A (en) * | 2019-06-10 | 2019-10-11 | 北京凯视达科技有限公司 | LED screen brightness correcting method and device |
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| CN101150732B (en) * | 2006-09-20 | 2010-08-11 | 王锦峰 | Imaging method and device for color image shot by black and white camera |
| CN107144993B (en) * | 2017-06-30 | 2020-05-05 | 惠科股份有限公司 | Display panel detection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110024020A (en) * | 2016-11-23 | 2019-07-16 | 三星电子株式会社 | Display device, calibrating installation and its calibration method |
| CN110322830A (en) * | 2019-06-10 | 2019-10-11 | 北京凯视达科技有限公司 | LED screen brightness correcting method and device |
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