Partition-Based Video Filters for Buffer and Quality Optimization

The patent divides the filtering operation into two distinct stages: an odd-line filter applied first, followed by an even-line filter. This segmentation allows each filter to operate with reduced buffer requirements compared to a single full adaptive loop filter, while collectively achieving the desired video quality improvement. The odd-line filter processes every other line, and the even-line filter processes the remaining lines, enabling progressive filtering with minimal buffering.

The patent applies the odd-line filter before the even-line filter in a sequential manner. This preliminary action on odd lines provides intermediate filtering results that the even-line filter can build upon, allowing the system to achieve complete filtering效果 with reduced buffer capacity compared to applying a single filter all at once.

By segmenting the filtering into odd-line and even-line filters applied sequentially, the patent reduces the strength and scope of individual filtering operations across block boundaries. This prevents any single filter from creating strong blockiness artifacts, while the combined effect of both filters still achieves smooth video quality improvement.

Each line filter (odd and even) applies partial filtering action rather than complete filtering across all lines. This partial action reduces the risk of creating blockiness artifacts at block boundaries, while the sequential application of both filters collectively achieves the desired overall filtering效果 without excessive local processing that would cause artifacts.