Patent ID: 6181345
Filing Date: 2001-01-30
Classification: H04N

Abstract:
A method for replacing a representation of a target zone with a pattern in successive images of a video sequence, suitable for use while the target zone has a position with respect to a background scene which changes during the video sequence, comprising, for each of successive images of the video sequence, the steps of:(a) assuming that said position changes at constant speed, determining a global transformation predicted from a stored reference image, generating a modified image by applying the global transformation to the reference image, and adjusting the predicted transformation through a global analysis of the image;(b) recognizing said representation of the target zone from a colour thereof and extracting boundaries thereof by segmentation; and(c) verifying a coherence of the recognition, subjecting said pattern to a transformation responsive to the representation recognized at step (b) and substituting the representation of the target zone, by the transformed pattern.