Matrix Intra Prediction Filter Selection for Video Coding Efficiency

The patent changes the parameters of the filtering operations by introducing multiple filter types (bilinear filter, bicubic filter, Lanczos filter) instead of using a single linear interpolation filter. This allows the system to adapt the filtering parameters based on block characteristics, thereby improving coding efficiency while maintaining reasonable processing complexity through selective filter application.

The patent implements dynamic filter selection based on block features such as variance and gradient calculations. The filtering approach transitions from static (always using linear interpolation) to dynamic (selecting different filters based on block characteristics), allowing the system to optimize coding efficiency for different types of video blocks while managing processing complexity through conditional logic.

The patent applies different filtering strategies to different regions or types of blocks based on their local characteristics. By calculating variance and gradient for each block and selecting filters accordingly, the system achieves local optimization of coding efficiency without uniformly increasing complexity across all blocks, thus balancing performance improvement with processing requirements.

The patent segments the filtering process into multiple stages: variance calculation, gradient calculation, filter selection, and application. This segmentation allows the system to manage complexity by breaking down the customized filter selection into discrete, manageable steps, where only necessary calculations are performed based on block characteristics.