Patent ID: 11962762
Assignee: KT CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A non-transitory computer-readable medium for storing compressed video data, the compressed video data comprising:
a coded block flag for determining whether there exist at least one non-zero residual coefficient in a current transform block; and
information on residual coefficients of the current transform block,
wherein inverse-quantized residual coefficients of the current transform block are obtained by performing an inverse-quantization for the current transform block,
wherein residual samples of the current transform block are obtained by skipping or performing an inverse-transform for the current transform block,
wherein the residual coefficients in the current transform block are decoded in a unit of a sub-block,
wherein a size of the sub-block is determined based on whether at least one of a width or a height of the current transform block is less than 4,
wherein in response that at least one of the width or the height of the current transform block is less than 4, the size of the sub-block is determined as 2×2, 2×8, or 8×2, and
wherein in response that both the width and the height of the current block are equal to or greater than 4, the size of the sub-block is determined as 4×4,
wherein whether a transform skip flag, indicating whether the inverse-transform is skipped or not, of the current transform block is present in the compressed video data or not is determined based on whether a coding block, including the current transform block, is partitioned into a plurality of transform blocks in a horizontal direction or a vertical direction, and
wherein in response that the current transform block is one of the plurality of transform blocks generated by partitioning the coding block in the horizontal direction or the vertical direction, the transform skip flag of the current transform block is not present in the compressed video data, and skipping the inverse-transform for the current transform block is not allowed.