Patent ID: 11895334
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain information on quantized transform coefficients from a bitstream;
derive quantized transform coefficients for a target block based on the information on the quantized transform coefficients;
derive transform coefficients by performing dequantization for the quantized transform coefficients for the target block;
perform an inverse transform for the transform coefficients based on an inverse transform matrix;
derive residual samples for the target block based on a result of the inverse transform; and
generate a reconstructed picture based on the residual samples for the target block and prediction samples for the target block,
wherein based on a number of input elements of the inverse transform being R, a size of the inverse transform matrix is N×R, where each of N and R is a positive integer, and R is less than N.