A method and apparatus of hiding identification data (12) in visual media. When image or video data is received, frequency masking (14) is performed to divide the image or video data into blocks of smooth regions and blocks of non-smooth regions and to obtain preliminary just-noticeable-difference. Edge detection is performed to divide the non-smooth region of the image or video data into texture blocks and edge blocks (16). The image or video data is then adjusted by applying different strength of watermark in association with the type of each block.
申请公布号
WO0233650(A8)
申请公布日期
2002.09.12
申请号
WO2001US32247
申请日期
2001.10.17
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;WU, MIN;YU, HONG, HEATHER