Digital watermarking technique

Details Digital watermarking technique Digital watermarking technique

H - Electricity

04

L

H04L 9/32 (2006.01) G06T 1/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2316442

A watermarking system allowing both sufficiently high quality of watermarked moving pictures and enhanced ease of watermark detection is disclosed. A watermark level of a watermark to be embedded into a picture of data is changed depending on the picture type of a selected block of frequency component data, and then a watermark having the watermark level is inserted into the selected block of frequency component data. Therefore, a moving-picture can be effectively embedded with a digital watermark without substantially reducing the quality of image and the digital watermark can be detected reliably. A relative proportion of watermark levels of I-picture, B- picture, and P-picture is preferably set to 10:7:5.

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