Apparatus and method for modifying a compressed video signal
A compressed video stream (10) that exhibits temporal redundancy (e.g., an MPEG-compliant video stream) is decompressed into an uncompressed domain representation (14), and the uncompressed domain representation is modified without substantially changing spatial relationships in the representation (...
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| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A compressed video stream (10) that exhibits temporal redundancy (e.g., an MPEG-compliant video stream) is decompressed into an uncompressed domain representation (14), and the uncompressed domain representation is modified without substantially changing spatial relationships in the representation (18). Such modifications might include adding watermarks to the uncompressed domain representation, removing watermarks from the uncompressed domain representation, altering watermarks in the uncompressed domain representation, and adjusting hue and intensity in the uncompressed domain representation. The modified representation is then recompressed using the same motion vectors that were used to produce the original video stream (20). Thus, the uncompressed domain representation is recompressed without recomputing new motion vectors1 thereby avoiding computationally intensive processing. |
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