Patent ID: 11956549
Assignee: B1 INSTITUTE OF IMAGE TECHNOLOGY, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
receiving a bitstream in which an image is encoded;
obtaining index information for specifying a block division type of a current block in the image from the bitstream;
determining the block division type of the current block from a candidate group pre-defined in the image decoding apparatus based on the index information;
dividing the current block into a plurality of sub-blocks based on the determined block division type; and
decoding each of the sub-blocks to reconstruct the current block,
wherein the current block is reconstructed by obtaining residual information from the bitstream and performing at least one of inverse-quantization or inverse-transformation for the residual information to generate a residual block for the current block,
wherein the candidate group includes at least one of a non-division, a first quad-division, a second quad-division, a binary-division or a triple-division, and
wherein the first quad-division divides one coding block into four coding blocks based one horizontal line and one vertical line, the second quad-division divides one coding block into four coding blocks based on three horizontal lines or three vertical lines, the binary-division divides one coding block into two coding blocks, and the triple-division divides one coding block into three coding blocks.