When we take pictures with LED display, the photos we take always feel with water ripples or scan lines. We often wonder if it is not as good as the legendary LED display. But some people say that there will be water ripples that are not actually LED displays. That's because you will cause water ripples when shooting because your angle and focus are different. Does that mean that? Today Xiaobian will take you to understand it. There are often people who mistakenly think that the water ripple is the scan line, which is a big mistake. First, the difference between water ripple and scanning line phenomenon The water ripple generally exhibits a random arc diffusion state. The scan line is a horizontal black stripe line, mainly due to the lower display refresh rate, captured by the camera! Second, the "water ripple" scientific name "Moiré" (Moiréeffect) When shooting a scene with a digital camera, if there is a dense texture, there are often inexplicable water-like stripes. Simply put, moiré is a manifestation of the principle of beat. Mathematically, an equal amplitude sine wave with two frequencies close to each other, the amplitude of the composite signal will vary according to the difference between the two frequencies. Third, the process of moiré generation 1. Two strips with slightly different spatial frequencies have the same black line at the left end. Because of the different spacing, the lines gradually overlap to the right. 2. The result of the overlap of the two stripes, the black line coincides on the left, 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 moiré. 3. The two sets of stripes in Figure 2 are completely coincident, and the typical moiré can be seen. Fourth, the display produces a moiré phenomenon process As shown in the figure above: The LED display is composed of RGB three-color units and is evenly distributed on the display. Note: If the LED display pixel density is just in the middle of the CCD distinguishable, it is inevitable that the digital camera will still interpret some of the identifiable results, but it will also add the grayscale zone that can be recognized. The sum of the two forms a regular pattern, and the response is visually periodic ripples. Fifth, the method of eliminating moiré 1. Change the camera angle. Since the camera's angle to the object can cause moiré, slightly changing the angle of the camera (by rotating the camera) can eliminate or alter any moiré present. 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 on the detailed pattern can lead to moiré, and a slight change in focus can change the sharpness and help eliminate the moiré. 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. 6, with software processing. Use the Photoshop plugin, etc. to eliminate any moiré that appears on the final image.
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