Local Illumination Compensation via Neighboring-Block Parameter Inheritance

The patent applies copying by inheriting LIC model parameters from neighboring blocks (source blocks) directly into current blocks. Instead of re-deriving parameters through complex calculations, the system copies the parameters from the source block, which has already been processed and validated. This copying approach maintains coding flexibility while significantly reducing computational complexity and latency in the coder.

The patent applies preliminary action by pre-deriving and storing LIC model parameters for source blocks before they are needed for current block processing. The parameters are computed and ready in advance for neighboring blocks that will serve as sources, eliminating the need for real-time re-derivation during decoding. This maintains parameter accuracy while reducing decoding latency significantly.

The patent applies feedback mechanisms by evaluating the inheritance of LIC parameters from neighboring blocks and using feedback information to determine when inheritance is appropriate. The system checks whether the neighboring block's parameters are reliable and suitable for inheritance, and can fall back to re-derivation or other methods when necessary. This feedback loop maintains parameter reliability while keeping coder complexity low through selective inheritance.