the difference:
★ (above left) The water ripples generally show a random arc diffusion state!
★ (above right) 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 effect" (Moiré effect)
When shooting a scene with a digital camera, if there is a dense texture, there are often inexplicable water-like stripes. This is the moiré. 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
â–²The above picture shows: The LED display unit is rented by the RGB tri-color unit and evenly distributed on the display.
â–² The figure above shows the detailed structure of the digital camera CCD. The color content of each pixel is calculated by the distribution of the mosaic color patches.
Note: If the LED display pixel density is just in the middle of the CCD distinguishable, the inevitable 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. Eliminate any moiré that appears on the final image, such as Nikon Capture or Photoshop plug-ins.
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