Patent ID: 7593541

Claim:
Method of image processing intended to display at least one anti-copy pattern in a sequence of video images, each video image comprising a plurality of pixels arranged in rows and columns, each pixel of said image having a predetermined intensity, wherein a set of pixels is selected from said image to insert said anti-copy pattern, the method comprising the steps of: displaying each pixel of the selected pixels with the predetermined intensity and inserting said anti-copy pattern by temporally modulating the predetermined intensity of the selected pixels about their predetermined intensity such that said anti-copy pattern is invisible to the human eye when the video images of the sequence are still and such that artifacts are generated when the video images of the sequence are copied by picture-taking during their display, estimating motion of at least the selected pixels between the images of at least one group of n consecutive images of the sequence, n being greater than or equal to 2, and motion compensating the selection of pixels within the images of said at least one group according to the estimated motion by changing from image to image of said at least one group, the selection of the pixels used to insert said anti-copy pattern in such a way that said anti-copy pattern moves according to the estimated motion of said selected pixels.