Adaptive Loop Filtering With Chroma Side Information in Video Coding

The patent changes the input parameters of the adaptive loop filter by incorporating chroma information (such as chroma residuals, chroma prediction samples, or chroma reconstruction samples) alongside luma information. This parameter expansion enables the filter to adaptively improve video coding efficiency and quality without requiring fundamentally new filtering mechanisms, thus improving productivity while maintaining manageable device complexity.

The patent applies local quality by using adaptive loop filtering that processes different regions of the video with different filtering characteristics. By incorporating chroma information and using adaptive filtering coefficients, the system can apply stronger filtering where artifacts are present and weaker filtering where quality is already good, effectively reducing video artifacts in high-resolution content while maintaining local image quality.

The patent implements partial action by selectively applying the enhanced filtering with chroma information only to regions where it provides significant benefit, such as high-resolution video content or areas with visible artifacts. This allows the system to achieve improved compression performance where needed while avoiding unnecessary processing power consumption in regions where traditional filtering suffices.