Motion Vector Correction Using POC Differences

The patent changes the parameter of motion vector correction by introducing POC difference-based scaling. Instead of directly using motion vectors from multiple reference lists, the system calculates POC differences between reference pictures and current picture, then scales motion vectors accordingly. This transforms the raw motion vector parameters into corrected parameters that account for temporal distance, improving prediction accuracy while maintaining manageable complexity through a systematic correction approach.

The patent applies preliminary action by pre-calculating POC differences between reference pictures and the current picture before motion vector correction. This preliminary computation of temporal distance metrics allows for more efficient subsequent processing, as the scaling factors are determined in advance rather than computed during the main prediction process, thereby improving coding efficiency while managing computational overhead.

The patent substitutes complex mechanical motion estimation processes with a mathematical scaling approach based on POC differences. Instead of performing extensive motion searches and comparisons, the system uses a formulaic approach where motion vectors are scaled by the ratio of POC differences. This replaces time-consuming mechanical search processes with efficient mathematical operations, improving motion accuracy while reducing processing time.