Why do cameras, video cameras, computers or televisions blink?

Analysis:

The reason is that the signals are out of sync!

We can understand that the camera is an image, and the TV and computer monitor play images, but we know that the camera does not record all the information of a series of actions, but takes image information every short time. If we shoot the image information once every second and present the recorded information once again, we will see the intermittent information of a picture coming out every second; What happens when you shoot a thousand times a second? The information obtained in this way is presented as a continuous action image! Television and monitor are responsible for presenting this discontinuous image information to us! Their principle is just the opposite of that of a camera. For example, if a TV gives us a picture information every second, then we are watching one picture after another. What if you show us 1000 photos every second? Can you still separate the images? This is a continuous animation!

It's okay to take pictures one by one with a camera and arrange objects, but what about using it to take pictures of TVs and monitors similar to your own works? Suppose the camera takes 100 photos per second and the computer monitor takes 120 photos per second. Suppose the camera takes a picture for the first time when the first picture is placed on the monitor, then the second picture on the monitor has been released when the second picture is taken, and then nothing will come from the camera! Then after a certain interval, the camera will take pictures while shooting and playing. It is because of this unsynchronization that the image flashes when the camera shoots TV and computer monitor!

Inappropriate, basically can be understood like this! The difference is that TV sets and monitors display different images, and the display of image information depends on pixels. We can compare the basic structure of the display to the chessboard of Go, but it is finer than the chessboard. The display of the display is to fill the top line of the chessboard with information first, then the second line, and then row down in turn. After a certain interval, the information in the first line is refreshed, so that we can see continuous images from top to bottom. So the TV monitor taken by the camera will be horizontal and flashing!

In addition, generally speaking, when the refresh rate is lower than 75HZ, our naked eyes will notice the flicker, but when it is higher than this frequency, it will not. In the past, the refresh rate of TV was basically 60HZ, because watching TV for a long time was very tiring and my eyes were blinking for this reason, so it would be much more comfortable to watch the monitor, because the refresh rate of the monitor was basically above 75HZ!