H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/08 (2006.01) G06K 9/00 (2006.01) G06K 9/36 (2006.01) G06T 1/00 (2006.01) H04L 9/00 (2006.01) H04N 1/387 (2006.01) H04N 1/40 (2006.01) H04N 1/46 (2006.01) H04N 1/60 (2006.01) H04N 7/025 (2006.01) H04N 7/081 (2006.01) H04N 11/00 (2006.01) H04N 11/24 (2006.01) H04N 5/445 (2006.01) H04N 7/16 (2006.01) H04N 7/24 (2006.01)
Patent
CA 2477511
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.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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