Motion compensation method and device using bidirectional optical flow
摘要
說明書
The decoder 310 extracts information about the CTU size from the sequence parameter set (SPS) or the picture parameter set (PPS), determines the size of the CTU, and splits a picture into CTUs of the determined size. Then, the decoder determines the CTU as the uppermost layer, that is, the root node, of a tree structure, and extracts splitting information about the CTU to split the CTU using the tree structure. For example, when the CTU is split using a QTBT structure, a first flag (QT_split_flag) related to splitting of the QT is extracted to split each node into four nodes of a sub-layer. For a node corresponding to the leaf node of the QT, a second flag (BT_split_flag) and the split type information related to splitting of the BT are extracted to split the leaf node into a BT structure.
Upon determining a current block to be decoded through splitting of the tree structure, the decoder 310 extracts information about the prediction type indicating whether the current block is intra-predicted or inter-predicted.
When the prediction type information indicates intra-prediction, the decoder 310 extracts a syntax element for the intra-prediction information (intra-prediction mode) about the current block.
