Patent US 4,600,281

The invention relates to substituting for an original sound track of a motion picture a new sound track in a different language while at the same time correcting the lip movements of actors in the film to correspond to the new language. The method makes use of selected equipment, such as a digital video image processor, a video display, a programmed digital computer, and selected data on a frame-by-frame basis as to mouth location, mouth shape, mouth movements, etc. of the actor on the film and the frame-by-frame photographed mouth area of the new actor supplying the new language sound. The computer cooperates with the image processor to effect the alteration in the lip shapes by varying the intensities of the video pixels in the facial area on the film in accordance with the data and the program in the computer, whereby the new sound track with correct lip movements may be substituted for the original sound track.