Patent ID: 11863746
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A transmission method for data including bitstream for an image, comprising:
obtaining the bitstream for the image, wherein the bitstream is generated by performing intra prediction on a current block to generate prediction samples of the current block, generating residual samples of the current block based on the prediction samples, performing primary transform on the residual samples of the current block to generate primary-transformed coefficients of the current block, performing secondary transform on the primary-transformed coefficients of the current block to generate secondary-transformed coefficients of the current block, and performing quantization on the secondary-transformed coefficients of the current block; and
transmitting the data including the bitstream for the image,
wherein the performing the secondary transform comprises:
determining a non-separable transform matrix based on an intra prediction mode of the current block; and
applying the non-separable transform matrix to the primary-transformed coefficients of the current block, and
wherein an input length and an output length of the secondary transform are respectively determined as 16 and 8 based on a size of the current block being 4×4.