Intra Block Copy Motion Candidate Limiting for Video Coding Efficiency

The patent applies partial action by selecting only the top N motion candidates (where N is a predetermined number smaller than the total number of available candidates) based on rate distortion cost. This partial selection approach maintains sufficient prediction accuracy while significantly reducing processing complexity, as the system only needs to evaluate and process the top N candidates rather than all possible motion candidates.

The patent changes the parameter of motion candidate selection by introducing an upper limit N on the number of candidates to be processed. This parameter modification transforms the unbounded search space into a bounded one, enabling the system to achieve a balance between prediction reliability and processing efficiency by controlling the search depth and computational load.

The patent applies preliminary action by pre-determining the upper limit N for motion candidate selection before the rate distortion optimization process. This preliminary constraint setting allows the fast RDO process to operate within a bounded search space from the outset, achieving good coding efficiency while preventing excessive processing time accumulation that would occur with unlimited candidate evaluation.

The patent implements the skipping principle by rapidly selecting only the top N motion candidates with the lowest rate distortion costs and skipping the detailed processing of remaining candidates. This rushing through approach maintains sufficient coding efficiency by focusing computational resources on the most promising candidates while dramatically reducing overall processing time compared to exhaustive evaluation.