Patent ID: 11956427
Assignee: SK TELECOM CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A non-transitory computer readable medium storing a bitstream generated by a method of encoding a current block of video data, the method comprising:
encoding, into a bitstream, transform coefficients corresponding to only part of sub-blocks in the current block, and sub-block information indicating a division form of the sub-blocks, wherein the transform coefficients are generated by transforming residual signals that are differences between pixels in the current block and predicted pixels thereof;
deriving a residual block of the current block from the transform coefficients on the basis of the sub-block information; and
filtering boundaries of the sub-blocks in a reconstructed block of the current block derived on the basis of the residual block,
wherein the sub-block information includes:
division direction information indicating a division direction of the sub-blocks; and
at least one of division type information indicating a division type of the sub-blocks between a binary division type and a quad division type and position information indicating a position of at least one transform sub-block which is a transformed region among the sub-blocks, wherein the deriving the residual block of the current block includes:
identifying the transform sub-block and at least one non-transform sub-block which is a region not transformed, on the basis of the sub-block information;
deriving residual samples corresponding to the transform sub-block, by inversely transforming the transform coefficients in the transform sub-block; and
setting residual samples corresponding to the non-transform sub-block as zero.