How did moire patterns come into being?

The main reason for moire fringe in photography is that the spatial frequency of the pixels of the camera photosensitive element is close to the spatial frequency of the fringe in the image actually taken by the camera. Moire is like the kind of lines produced in the picture below. If the landlord wants to reduce moire, the resolution of the camera should be less than the spatial frequency of the photosensitive element. In this way, there will be no fringe similar to the photosensitive element in the image, and there will be no moire fringe.

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