Systems and methods for encoding redundant motion vectors in compressed video bitstreams
View Patent ↗The invention is related to methods and apparatus that encode redundant motion vectors for predictive-coded visual object planes (P-VOPs) to increase the robustness of transmitted video signals. One embodiment provides the redundant motion vectors in a user data video packet of an MPEG-4 compliant bitstream, which thereby allows the enhanced bitstream to remain compliant with MPEG-4 syntax and backwards compatible with MPEG-4 decoders. The enhanced bitstreams allow a video decoder to display a video with a better picture and relatively less error and error propagation when portions of the bitstream are disturbed or corrupted by interference, delays, and the like.
1. A user data video packet in a video bitstream comprising: a start code corresponding to syntax that indicates a user data video packet; and data corresponding to a motion vector of a portion of a current frame relative to a portion of a frame earlier in time than the current frame; additional data in the user data video packet corresponding to a temporal relationship between the current frame and the frame.
2. The user data video packet as defined in claim 1 , where the user data video packet follows a corresponding data packet that includes a standard motion vector for the current frame relative to a different frame than the frame.
3. The user data video packet as defined in claim 1 , where the user data video packet is identified by a start code such that a decoder that is not capable of using the motion vector in the user data video packet ignores the user data video packet.
4. The user data video packet as defined in claim 1 , further comprising a user data header code to identify the data in the user data video packet corresponding to the motion vector.