Coding Artifacts Removal Using Original Pixel Values

The patent applies preliminary action by determining all target pixels for both horizontal and vertical edges before performing any filtering operations. This is achieved by using a target pixel determination unit that identifies pixels requiring filtering based on gradient calculations, and then using a pixel value holding unit to preserve original pixel values. This allows subsequent filtering to be performed on accurately identified target pixels without the interference of sequential processing artifacts, thereby preventing object edge blurring while maintaining coding efficiency.

The patent applies the copying principle by creating and maintaining copies of original pixel values through the pixel value holding unit. When determining target pixels for vertical edges, the system references copied pixel values from the holding unit rather than using already-filtered horizontal edge pixels. This ensures that target pixel determination is based on original, unaltered data, preventing false identification of object edges as coding artifacts. The copying mechanism preserves data integrity while enabling simultaneous processing of multiple edges, thus improving image quality reliability without significantly increasing processing complexity.