1. A method of modifying video images which belong to a sequence and which are mutually correlated, said method comprising the steps of: storing a representation of a target to be replaced with a stored model in said images; storing a plurality of successive ones of said images of said sequence in a buffer memory; searching for the target in the stored images by pattern recognition until the target is found with reliability in at least one of said stored images; carrying out reverse and forward predictions as to the location of the target in said stored images which precede and follow the image where the target is found, based on an evaluation of global changes of the stored images, whereby precise identification of the location of the target in a particular one of said images is achieved even when only part of the target is available within the particular image; and replacing said target with a respective representation of the model.