| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic watermarking scheme for digital video. <P>SOLUTION: Electronic watermark data is effectively placed in at least one of bit positions, e.g., of an integer portion, of the average value of selected at least one of 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 resultant 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 electronic watermark data survives any MPEG encoding, while minimizing resultant artifacts. A receiver extracts the bit of electronic watermark data from the selected bit position of the average value of the chrominance portion. <P>COPYRIGHT: (C)2012,JPO&INPIT |
