| 摘要 |
PROBLEM TO BE SOLVED: To modify a compression encoded video sequence. SOLUTION: A video sequence modifying method includes steps of: detecting inter-encoded pictures within a group of pictures; extracting image blocks from the detected inter-encoded pictures; compressing at least a portion of the extracted image blocks to form compressed image block data; and inserting replacement image blocks and the compressed image block data into the video sequence to replace the extracted image blocks, the replacement image blocks each have a motion vector of value zero and a difference signal of value zero. By providing replacement picture data which represent replacement image blocks having a motion vector of value zero and a difference signal of value zero, sets the inter-encoded pictures of the modified video sequence to display, when decoded, the same image as that displayed on the previous intra-encoded picture, thereby providing a form of removable (washable) impairment such as a visible watermark. COPYRIGHT: (C)2007,JPO&INPIT |
