Adaptive Loop Filter with Neighbor-Based Affine Motion Derivation

The patent uses neighboring block motion vectors as copies or proxies for the current block's motion vector. Instead of encoding the actual motion vector, the system derives it by copying and adjusting motion vectors from spatially or temporally neighboring blocks, thereby reducing data rate while maintaining acceptable motion information accuracy.

The patent introduces an intermediary derivation process that uses neighboring block motion vectors as mediators to obtain the current block's motion vector. This intermediary approach allows the system to avoid directly encoding motion vectors while still achieving accurate motion representation through spatial and temporal correlations.

The system copies motion vector information from neighboring blocks instead of encoding complete motion vector data for each block. This copying mechanism maintains motion representation accuracy by leveraging spatial and temporal correlations while significantly improving coding efficiency by reducing the amount of data that needs to be encoded and transmitted.

The patent applies partial action by encoding only the necessary motion vector data (such as motion vector differences or indices to neighboring blocks) rather than complete motion vectors for all blocks. This partial encoding approach maintains sufficient motion representation accuracy while substantially improving coding efficiency.