IMAGE-ENCODING METHOD, IMAGE-DECODING METHOD, IMAGE-ENCODING DEVICE, IMAGE-DECODING DEVICE, AND IMAGE-ENCODING-DECODING DEVICE

摘要

An image-encoding method includes a step for performing node processing on a node of a tree structure (S501), and an encoding step for encoding the frequency coefficient of an image block corresponding to a leaf node of the tree structure, or an image block corresponding to a parent node of the leaf node (S503). In the node processing step (S501), when node processing is performed on a parent node having a child node, the position of an image block corresponding to the child node and the position of an image block corresponding to the parent node are applied to a node process parameter, and the node process is recursively called for the child node; and when node processing is performed on a leaf node, the position of an image block corresponding to the leaf node and the position of an image block corresponding to the parent node of the leaf node are applied to an encoding process parameter, and the encoding process is called.