Template-Matching Motion Vector Refinement With Partial Reconstruction

The patent performs preliminary reconstruction of neighboring blocks before template matching operations. By reconstructing blocks in advance and making them available in a buffer, the system eliminates waiting time during template matching while maintaining accuracy. The reconstruction is done beforehand so that when template matching needs to access neighboring block samples, they are already ready in memory.

The patent divides the video picture into multiple blocks and processes them in a specific scanning order (e.g., raster scan). By segmenting the processing into discrete block units and managing their reconstruction and availability independently, the system can optimize the timing of reconstruction operations for each block, reducing overall latency while maintaining the accuracy needed for template matching.

The patent employs in-loop filtering that automatically processes reconstructed blocks to improve their quality. The filtering operations (deblocking, SAO, ALF) are applied automatically during the reconstruction process itself, improving template matching accuracy without requiring additional separate processing stages. The system serves its own need for high-quality reference blocks through built-in filtering capabilities.

The patent integrates multiple functions into the reconstruction process: blocking compensation, in-loop filtering, and template preparation all occur within the same processing pipeline. The reference picture buffer serves both as a storage mechanism and as an active participant in the filtering and reconstruction processes, reducing the need for separate dedicated structures for each function.