When you use a mobile phone or camera to take a close shot of an LED film screen, there are often water ripples, which are called moire, or water ripples. So how does the LED film screen water ripple come into being? How to solve it?

What is the cause of water ripple on LED film?

Water ripple is a manifestation of the beat principle. When two equal amplitude sine waves with close frequency are superimposed, the amplitude of the synthesized signal will change according to the difference between the two frequencies. Water ripple generally presents an irregular arc diffusion state.

How to eliminate the LED film screen water ripple?

1. Change the camera angle. The water ripple phenomenon can be eliminated or improved by changing the camera's shooting angle or rotating the camera's focal length.

2. Change the camera position. The molar ripple can be reduced by moving left and right or up and down to change the angle relationship.

3. Change focus. Too clear focus and high detail may lead to molar ripples. Changing the focus can change the definition, which can help eliminate molar ripples.

4. Change the lens focal length. Different lens or focal length settings can be used to change or eliminate molar ripple.

5. Use the front filter to make its exposure conditions meet the spatial frequency, completely filter the high spatial frequency part of the image, and reduce the chance of moire, but this will also reduce the sharpness of the image simultaneously.

The above is the way to eliminate water ripple. Water ripple is not the problem of LED film screen itself. Even when shooting conventional LED display screen, water ripple will appear, which is a common phenomenon! The effect of water ripple can only be improved or eliminated from the shooting equipment.