Defocused video image restoration method and system

The invention provides a defocused video image restoration method and system. The method specifically comprises the steps that 1, edge detection is conducted to obtain the edge of a dark ring; 2, the detected edge is subjected to opening operation to obtain the thinned edge; 3, a point spread function is acquired through the radius of the dark ring; 4, image restoration is conducted through wiener filtering. By the means of the method and system, defocusing blurring video signals are restored; in the defocusing processing algorithm, a Canny operator is introduced to detect the dark ring on the innermost layer of a spectral image, and then the detected edge is thinned through the mathematical morphology opening operation; in this way, the calculation accuracy of the radius of the detected dark ring is improved, and the defocused image restoration effect is improved.