Watermarking scheme for digital video

摘要

Watermark data is effectively placed in at least one of the bit positions, e.g., of the integer portion, of the average value of at least a selected one of the chrominance portions of up to each block, on up to a frame-by-frame basis. Values of the selected chrominance portion of individual pixels in a block may be adjusted if necessary in order to cause the resulting substitution of the selected bit of the average. The bit position replaced may be a function of the block's busyness. A “margin” value may also be added to the average value in order to better ensure that the bit of watermark data survives any MPEG encoding, while minimizing resulting artifacts. A receiver extracts the bit of watermark data from the selected bit position of the average value of the chrominance portion.

主权项

1. A method of watermarking a video signal to include additional information therein, said method being performed by an apparatus for watermarking a video signal, the method comprising the step of automatically impressing at least a portion of said additional information upon a chrominance portion of said video signal by placing it in at least one selected bit position of a value derived from an average of said chrominance portion over a block of said video signal.