Patent ID: 11863778
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A transmission method of data for an image, comprising:
obtaining a bitstream for the image, wherein the bitstream is generated based on generating a residual sample array, determining a vertical transform type applied to a vertical direction and a horizontal transform type applied to a horizontal direction of a current block, performing transform on the current block based on the vertical transform type and the horizontal transform type, generating an MTS index, wherein the MTS index corresponds to one of a plurality of transform combinations within a transform configuration group, the one of the plurality of transform combinations includes the vertical transform type and the horizontal transform type, and wherein the MTS represents a transform method performed based on a transform combination selected from the plurality of transform combinations, deriving a quantized transform coefficient array with a width and a height of the current block by performing quantization on the current block, and performing entropy-encoding on the current block; and
transmitting the data comprising the bitstream,
wherein the bitstream includes a sequence parameter set,
wherein the sequence parameter set includes an MTS intra enabling flag representing whether the MTS index could be present in a syntax for an intra coding unit and an MTS inter enabling flag representing whether the MTS index could be present in a syntax for an inter coding unit,
wherein performing the transform on the current block includes:
performing, based on the horizontal transform type, a one-dimensional transform process in the horizontal direction on each of rows of the residual sample array; and
performing, based on the vertical transform type, a one-dimensional transform process in the vertical direction on each of columns of an intermediate sample array output by the one-dimensional transform process for each of the rows of the residual sample array,
wherein the plurality of transform combinations includes at least one of a first transform type, a second transform type, or a third transform type, and
wherein the first transform type, the second transform type, and the third transform type are different from each other.