Predictive motion vector coding
Overlapped block disparity estimation and compensation is described. Compensating for images with overlapped block disparity compensation (OBDC) involves determining if OBDC is enabled in a video bit stream, and determining if OBDC is enabled for one or more macroblocks that neighbor a first macroblock within the video bit stream. The neighboring macroblocks may be transform coded. If OBDC is enabled in the video bit stream and for the one or more neighboring macroblocks, predictions may be made for a region of the first macroblock that has an edge adjacent with the neighboring macroblocks. OBDC can be causally applied. Disparity compensation parameters or modes may be shared amongst views or layers. A variety of predictions may be used with causally-applied OBDC.
1. A method comprising:
receiving data representing a block motion compensated video bit stream;
decoding, by a decoder based on the received data, a first block partition having a prediction type of inter-prediction,
decoding, by the decoder based on the received data, a second block partition having a prediction type of inter-prediction, the second block partition being edge adjacent to the first block partition;
decoding, by the decoder based on the received data, a third block partition; and
decoding, by the decoder based on the received data, an explicit signal, the explicit signal indicating a mode for the first block partition,
wherein a first mode identified by the explicit signal identifies the first block partition as being block motion compensated by motion vector information of the second block partition, and
a second mode identified by the explicit signal identifies the first block partition as being block motion compensated by motion vector information of the third block partition without motion vector information of the second block partition.
2. The method of claim 1 , wherein the first block partition and the second block partition are bi-predicted using multiple references.
3. The method of claim 1 , wherein in the first mode, decoding the first block partition comprises predicting one or more pixels of the first block partition using the motion vector information of the second block partition.
4. The method of claim 1 , wherein the inter-prediction comprises bipredictive or multi-hypothesis inter-prediction.
5. The method of claim 1 , wherein the explicit signal is included in header information of the received data.
6. The method of claim 1 , wherein the second block partition is ordered before the first block partition in the video bit stream.