Deblocking Filter Boundary Strength at IBC Block Edges

The patent applies deblocking filters selectively based on local characteristics of block boundaries. Boundary strength values (BS=0,1,2) are assigned to different boundaries based on motion vector differences, intra/inter prediction modes, and block types. This local differentiation allows strong filtering only where needed (high motion boundaries) while skipping filtering where unnecessary (low motion boundaries), thus improving video quality at block boundaries without uniformly increasing computational complexity across the entire high resolution video frame.

The patent changes the parameter of filter application from universal to conditional by introducing boundary strength as a control parameter. The boundary strength (0, 1, or 2) is determined by parameters such as motion vector difference thresholds, prediction modes, and block types. This parameter change enables the system to adapt filter application to local video characteristics, reducing bandwidth consumption by avoiding unnecessary filtering operations while maintaining blocking artifact reduction where it matters most.

The patent implements partial action by selectively considering motion vector difference only for specific boundary cases where it provides the most benefit. The method calculates motion vector differences and compares them against thresholds, but only applies this complex calculation when boundary conditions warrant it (e.g., inter-predicted blocks with potential high motion). For other boundaries with simpler characteristics, the patent uses simpler boundary strength determination methods, thus achieving improved filtering accuracy where needed without excessively increasing processing complexity across all boundaries.