Digital watermarking technique

Details Digital watermarking technique Digital watermarking technique

2006-08-15

2006-08-15

Wu, Jingge (Department: 2621)

Image analysis

Applications

C382S232000

Reexamination Certificate

active

07092546

ABSTRACT:
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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