Method based on still image scene judgment to avoid noise amplification

The invention discloses a method based on still image scene judgment to avoid noise amplification. The method is characterized by including the following steps: 101, calculating Global Motion between a previous image frame and a current image frame, wherein Global Motion=(Sigmai=N/Rcur(i)-Rpre(i)/+/Gcur(i)-Gpre(i)/+/Bcur(i)-Bpre(i)/)/(3xN), N refers to number of pixel points of each image frame, Rcur(i), Gcur(i) and Bcur(i) refer to gray-scale values of R, G and B components of an ith pixel point in the current frame, and Rpre(i), Gpre(i) and Bpre(i) refer to gray-scale values of R, G and B components of an ith pixel point in the previous frame. By the method, the problem that noise is amplified caused by the fact that existing overdrive technology cannot adapt to changing of input signals when image scenes are still is solved, and image display quality can be improved.