Patent ID: 7386147
Filing Date: 2008-06-10
Classification: G06T,H04N

Abstract:
1. A method for the watermarking of a sequence of video images, implementing a step for the insertion of at least one watermarking bit into at least one motion vector obtained by motion estimation between two images of said sequence, so as to obtain at least one watermarked motion vector, said motion vector being identified by its coordinates in a reference space, associated with a reference grid comprising a plurality of blocks, each block being partitioned into two zones of complementary types, one zone surrounding the other zone, each zone having a distinct binary value associated with it, said insertion step determining in which block and which zone of said block the motion vector is located and implementing, if necessary, a modification of the coordinates of the motion vector so that it is located in a zone with a binary value corresponding to said watermarking bit to be inserted, wherein, during said modification, at least two potential watermarked motion vectors are determined and, from among said potential watermarked motion vectors, an optimal watermarked motion vector is selected according to at least one predetermined criterion, so that the modified coordinates of said motion vector are those of said optimal watermarked motion vector.