Patent ID: 11968398
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. An apparatus for transmitting data for a video, the apparatus comprising:
at least one processor configured to obtain a bitstream for the video, wherein the bitstream is generated based on performing a primary transform on a transform block, deriving a secondary transform matrix to be applied to the transform block, wherein the secondary transform matrix is used for a secondary transform outputting L (L<N) coefficients (L×1 vector) based on inputted N coefficients (N×1 vector), performing the secondary transform on the transform block based on the secondary transform matrix, obtaining transform coefficients based on the secondary transform, deriving quantized transform coefficients by performing a quantization on the transform coefficients and encoding information related to the quantized transform coefficients, and generating a secondary transform index corresponding to the secondary transform matrix; and
a transmitter configured to transmit the data comprising the bitstream,
wherein zero transform coefficients are at specific transform coefficient locations, and
wherein the specific transform coefficient locations are arranged in a diagonal scan order from a (L+1)th location to a 16th location in the transform coefficients of the block to which the secondary transform is applied, the block being a 4×4 block, N being 16, and L being 8.