Patent ID: 11910094
Assignee: B1 INSTITUTE OF IMAGE TECHNOLOGY, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method of decoding a current image with a decoding apparatus, comprising:
receiving a bitstream including the current image;
dividing, based on coding information from the bitstream, a coding block in the current image to obtain one or more sub-blocks,
wherein the coding information includes at least one of a first flag indicating whether to divide the coding block to obtain one or more sub-blocks, a second flag indicating whether to divide the coding block asymmetrically, or a third flag indicating whether a division direction for the coding block is a horizontal direction or a vertical direction, and
wherein, in case the coding block is divided asymmetrically, a first sub-block having a ¼ size of the coding block is obtained, the first sub-block belonging to the one or more sub-blocks;
obtaining inverse-quantized coefficients of the first sub-block by performing inverse-quantization on the first sub-block;
determining a transform method among a plurality of transform methods based on information for transform included in the bitstream:
reconstructing a residual signal of the first sub-block by performing inverse-transform on the inverse-quantized coefficients based on the determined transform method; and
reconstructing the coding block based on the residual signal and a prediction signal corresponding to the residual signal,
wherein the prediction signal is generated by obtaining prediction information for the coding block from the bitstream, determining a prediction method for the coding block based on the prediction information, and performing prediction for the coding block based on the determined prediction method, and
wherein obtaining the inverse-quantized coefficients of the first sub-block comprises:
selecting one of a plurality of weight set candidates pre-defined in the decoding apparatus; and
performing the inverse-quantization on the first sub-block based on the selected weight set candidate.