Video Encoding And Decoding With Transform Skip For Chroma Compression

The patent applies parameter changes by dynamically adjusting the transform skip mode based on block characteristics. When the residual energy is low or the block size is small, the transform skip mode is activated to avoid unnecessary transform operations, thereby reducing the data volume while maintaining image quality. This selective application of transform operations optimizes the balance between quality and compression efficiency.

The patent implements local quality by applying different processing strategies to different blocks within the image. Instead of uniformly applying transform operations to all blocks, the method evaluates each block's characteristics (residual energy, size, gradient) and applies transform skip mode locally where appropriate. This localized approach reduces overall data volume while preserving image quality in regions where it matters most.

The patent applies partial action by selectively skipping transform operations for certain blocks where they would be redundant or less effective. By using criteria such as low residual energy, small block size, or low gradient magnitude, the method identifies blocks where transform operations can be omitted without significantly compromising compression efficiency. This partial application of transforms reduces computational complexity while maintaining acceptable compression performance.

The patent segments the image processing into distinct evaluation and execution phases. Each block is independently evaluated against multiple criteria (residual energy, block size, gradient), and the transform skip decision is made segment-by-segment rather than applying a uniform operation to the entire image. This segmentation allows for efficient computational complexity reduction while preserving compression efficiency in regions where transforms are beneficial.