How to judge whether the object photographed by the camera is dynamic rather than static?

No matter what movie it is, it can be broken down into pictures, which can be saved at any time, and then the color of each pixel in it can be obtained, and then this color can be compared with the points saved in history. If not, it proves that the image is moving. . . In other words, the object is moving. . Otherwise, it means no exercise. .