Block Vector Predictor Refinement for Lower Video Signaling Overhead

The patent applies preliminary anti-action by proactively constraining BVP candidates to fall within the decoded region before they can cause prediction errors. The encoder and decoder both enforce this constraint when generating candidate BVPs, preventing the problem of out-of-bound predictions rather than correcting it afterward. This anticipatory constraint ensures prediction accuracy is maintained while preserving flexibility through multiple constrained candidate options.

The system applies self-service by having the decoder independently verify and enforce the decoded-region constraint on received BVP candidates without requiring additional signaling from the encoder. The decoder uses locally available decoded picture buffer information to validate BVP candidates, eliminating the need for the encoder to transmit constraint information. This self-verification mechanism maintains prediction accuracy while avoiding increased signaling overhead.

The patent applies preliminary action by pre-filtering BVP candidates during the candidate generation phase to ensure they fall within the decoded region. This preliminary constraint application reduces the number of invalid candidates that would otherwise require evaluation and rejection. By performing this filtering action early in the prediction process, the system maintains prediction quality through multiple valid candidates while reducing computational complexity by eliminating obviously invalid options before detailed evaluation.