Motion compensation method and device using bidirectional optical flow
摘要
說明書
The adder 350 adds the residual block output from the inverse transformer and the prediction block output from the inter-predictor or intra-predictor to reconstruct the current block. The pixels in the reconstructed current block are utilized as reference samples for intra-prediction of a block to be decoded later.
The filter unit 360 deblock-filters the boundaries between the reconstructed blocks in order to remove blocking artifacts caused by block-by-block decoding and stores the deblock-filtered blocks in the memory 370. When all the blocks in one picture are reconstructed, the reconstructed picture is used as a reference picture for inter-prediction of blocks in a subsequent picture to be decoded.
The encoding apparatus performs motion estimation and compensation in a coding unit (CU) in an inter-prediction operation, and then transmits a resulting motion vector (MV) value to the decoding apparatus. The encoding apparatus and the decoding apparatus may further correct the MV value in a pixel unit or a subblock unit (i.e., sub-CU) smaller than the CU using the BIO. That is, the BIO may precisely compensate for motion of the coding block CU in the unit of a 1×1 block (that is, one pixel) or the n×n block. In addition, since the BIO process is performed by applying an explicit equation using pre-decoded information shared between the encoding apparatus and the decoding apparatus, signaling of additional information for the BIO process from the encoding apparatus to the decoding apparatus is not required.
