Intra Block Copy BVP Adjustment Under Reference-Region Constraints

The patent applies preliminary action by adjusting block vector predictors before they are used for prediction. The encoder modifies BVP candidates based on IBC reference region constraints in advance, ensuring that out-of-range coordinates are corrected before prediction operations. This preliminary adjustment improves prediction accuracy while managing complexity through systematic preprocessing of predictor candidates.

The patent implements dynamics by adaptively adjusting BVP coordinates based on IBC reference region boundaries. The system dynamically modifies predictor candidates when they fall outside valid regions, using conditional logic to determine adjustments. This dynamic approach allows the system to maintain high prediction accuracy for valid predictors while efficiently handling edge cases without excessive complexity.

The patent applies preliminary action by pre-ordering candidate BVPs based on derived costs before the actual prediction process. The encoder calculates cost metrics for each candidate and arranges them in optimal order in advance, ensuring that the most promising predictors are evaluated first. This preliminary sorting improves prediction efficiency by reducing the average number of candidates that need full evaluation.

The patent implements parameter changes by introducing cost-derived ordering as a new parameter for organizing BVP candidates. The system changes the arrangement parameter of candidates from arbitrary or simple sequential order to cost-based optimal order. This parameter transformation improves prediction efficiency by aligning the evaluation sequence with predicted performance, while the computational overhead is managed through efficient cost calculation methods.