Use of temporal context for encoding delta updates.
- Used three probability approach for temporal context as follows: P0 - probability of no change if both above and left not changed P1 - probability of no change if one of above and left has changed P2 - probability of no change if both above and left have changed In addition, a 1 bit/frame has been used to decide whether to use temporal context or to encode directly. The cost of using both the schemes is calculated ahead and the temporal_update flag is set if the cost of using temporal context is lower than encoding the segment ids directly. This approach has given around 20% reduction in cost of bits needed to encode segmentation ids. Change-Id: I44a5509599eded215ae5be9554314280d3d35405
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