What should do if there is Moore pattern of LED advertising vehicle?
Time:2019-10-11
Views:958
What is the water ripple (moore pattern) of the LED advertising vehicle? The water ripple is different from the scanning line, and it generally exhibits a random arc diffusion state. How did it come about? So how can the LED advertising car display show such a texture? Is there any way to solve it?
The process of water ripple generation: (1) Two stripes with slightly different spatial frequencies have the same black line at the left end. Due to the different spacing, the line stripes on the right side cannot overlap. (2) The two stripes overlap, and the black line coincides on the left side, so the white line can be seen. The right side is gradually misplaced, the white line is facing the black line, and the overlapping result becomes completely black. There are white lines and all black variations that make up the ripples (moore lines).
LED display screen produces water ripple phenomenon: LED display pixel distribution density is just between the CCD resolution interval, the inevitable digital camera will still interpret some identifiable results, but it will not be recognized In the gray-scale zone, the sum of the two forms a regular pattern, and the response is visually periodic ripples.
The above describes the process of water ripple generation and the reasons for the LED display. Let‘s talk about the method of eliminating moiré:
1. Change the camera angle. Since the angle at which the camera captures an object causes a moiré, slightly changing the angle of the camera, by rotating the camera, any moiré present can be eliminated or changed.
2. Change the camera position. In addition, the moiré can be reduced by changing the angular relationship by moving left and right or up and down.
3. Change the focus. Too sharp focus and high detail can lead to moiré, and a slight change in focus can change the clarity, which in turn helps the fire moir.
4. Change the lens focal length. Different lens or focal length settings can be used to change or eliminate moiré.
5. Use the pre-mirror filter directly on the front of the CCD to make the exposure conditions meet the spatial frequency, thoroughly filter the high spatial frequency part of the image, and reduce the chance of moiré, but this will also reduce the sharpness of the image.
LED display screen produces water ripple phenomenon: LED display pixel distribution density is just between the CCD resolution interval, the inevitable digital camera will still interpret some identifiable results, but it will not be recognized In the gray-scale zone, the sum of the two forms a regular pattern, and the response is visually periodic ripples.
The above describes the process of water ripple generation and the reasons for the LED display. Let‘s talk about the method of eliminating moiré:
1. Change the camera angle. Since the angle at which the camera captures an object causes a moiré, slightly changing the angle of the camera, by rotating the camera, any moiré present can be eliminated or changed.
2. Change the camera position. In addition, the moiré can be reduced by changing the angular relationship by moving left and right or up and down.
3. Change the focus. Too sharp focus and high detail can lead to moiré, and a slight change in focus can change the clarity, which in turn helps the fire moir.
4. Change the lens focal length. Different lens or focal length settings can be used to change or eliminate moiré.
5. Use the pre-mirror filter directly on the front of the CCD to make the exposure conditions meet the spatial frequency, thoroughly filter the high spatial frequency part of the image, and reduce the chance of moiré, but this will also reduce the sharpness of the image.
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