Joint Sub-pixel Interpolation Filter for HEVC Temporal Prediction

The patent applies dynamics by making the interpolation filter adaptable to different sub-pixel offset conditions. Instead of using a fixed conventional filter, the system dynamically selects or adjusts filters based on the specific sub-pixel offsets of reference blocks, allowing the filter characteristics to change according to the motion prediction requirements. This resolves the contradiction by enabling high accuracy when needed while maintaining simplicity through selective application.

The patent changes the parameters of the interpolation filter based on sub-pixel offset values. By adjusting filter coefficients and tap lengths according to the specific sub-pixel positions of reference blocks, the system optimizes interpolation accuracy for different motion scenarios. This parameter adaptation allows the filter to maintain high precision across varying conditions without requiring a completely complex system architecture.

The patent merges the interpolation filtering operations for multiple reference blocks into a unified joint filtering process. Instead of independently applying separate filters to each reference block and then combining results, the system performs a single joint interpolation that simultaneously accounts for sub-pixel offsets of both reference blocks. This merging approach maintains optimization for each block while reducing overall processing complexity through operational consolidation.

The patent creates a universal joint interpolation filter that serves multiple reference blocks simultaneously. This multi-functional filter design allows a single filtering operation to handle interpolation for both reference blocks in bi-prediction scenarios, eliminating the need for separate dedicated filters for each block. The universal filter maintains accuracy for each block while simplifying the overall system architecture.

The patent applies homogeneity by ensuring consistent filter application across multiple reference blocks in bi-prediction. The joint interpolation filter uses uniform filtering operations for both reference blocks, eliminating the inconsistency that causes signal distortion and noise. This homogeneous approach maintains sub-pel accuracy while ensuring that both reference blocks are processed with the same filtering characteristics, preventing harmful artifacts.

The patent introduces a joint interpolation filter as an intermediary that mediates between multiple reference blocks with different sub-pixel offsets. This intermediary filter harmonizes the interpolation process by applying coordinated filtering that accounts for both reference blocks' positions simultaneously. The mediator filter prevents the signal distortion and noise that arise from inconsistent separate filtering by providing a unified interpolation approach.