1. An image processing method to process a moving image, which is shot by a predetermined video shooting device, in increments of access units, imaging blur being represented by a corresponding low-pass filter showing the properties of imaging blur which occurs at the time that said moving image is shot with said video shooting device, comprising the steps of: generating an inverse filter having inverse properties as to said low-pass filter; and performing processing to apply said inverse filter to each of the access units to be processed, wherein said step of generating an inverse filter includes applying an iterative algorithm in a frequency domain based on a blurred image gain function G, a point spread function H and iteratively calculated original image gain functions F.