Method, system, and computer program for warp extension and warp delta signaling using backup candidates

Abstract

Various embodiments described herein include methods and systems for coding video. In one aspect, the method includes obtaining encoded video data including a plurality of blocks and obtaining a motion vector predictor (MVP) candidate block from an MVP list based on an MVP index. The method further includes determining whether the MVP candidate block is suitable for the warp extension mode in accordance with a determination that a block of the plurality of blocks is designated for the warp extension mode. The method also includes identifying a backup MVP candidate block suitable for the warp extension mode in accordance with a determination that the MVP candidate block is not suitable for the warp extension mode. The method further includes obtaining a warp model from the backup MVP candidate block and performing a warp extension operation on the block using the warp model.