Why does the computer screen ripple when you shoot it with a camera?

Many people will find a strange phenomenon in their daily life, that is, no matter what kind of camera is used to take pictures on the computer screen, ripples will appear. Why? In fact, this kind of ripple is called moire fringe. In order to help you understand this problem, here is a brief introduction.

What are Moore stripes? Moire fringe is an optical phenomenon first discovered by Mr Moore. This phenomenon refers to an optical phenomenon that different stripes and lines interfere from a specific angle or frequency. When it is difficult for people to distinguish these lines and objects with the naked eye, they can only see the fringes of the interfered pattern, which is the secret of moire fringes.

When we shoot a computer screen with a camera, there will be moire fringes with different shapes. No matter how high the pixels of a mobile phone or camera are, they will appear in the process of shooting a computer screen.

What caused the ripples in the photo? In fact, knowing the causes of moire fringes, we can well analyze these ripples in the process of taking pictures on the computer screen. In fact, the reason why ripples appear in the process of taking pictures is mainly because of the mutual interference of spatial frequencies, and there will be time-space overlap in the process of taking pictures. These lines are not real, but the illusion caused by interference.

When we shoot a computer screen with a mobile phone or camera, there will be other image information superimposed, which is difficult for the mobile phone camera to distinguish effectively, so there will be many mysterious ripples in the shooting process. In fact, this is an optical phenomenon, and people need not be too surprised.

People who often watch TV may find a line moving up and down on the computer when the camera took pictures of it a long time ago. This is actually a moire fringe, just like the ripple in the photo.

How can I avoid ripples in photos? Knowing the cause of moire fringe, we can set the camera parameters in the process of taking pictures, so that this fringe will no longer appear in the photos taken. Generally speaking, the camera of our mobile phone has a frequency setting. In order to effectively reduce the probability of stripes, we should use the module to reduce flicker. After entering, we can effectively avoid ripple by adjusting the flicker speed to be less than the frame rate of the computer screen. For example, if the frame rate of our computer screen is 50, then we can adjust the flashing speed to 1/40 or 1/30, which can effectively avoid the appearance of ripples. Of course, there are many ways to deal with it. If you have any good methods, please leave a message for discussion.

In short, the phenomenon of moire fringes often occurs in daily life, so people should have a clear understanding of moire fringes, and this problem can be avoided as long as the causes of moire fringes can be effectively dealt with. I suggest you learn more about optics in your daily life to help us better understand and solve optical phenomena in our lives and help us deal with problems more pertinently.