Patent ID: 11876967
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. An image encoding method performed by an image encoding apparatus, the method comprising:
deriving a value of a residual sample of a current block based on a color space conversion being applied;
deriving transformation coefficient of the current block based on the residual sample of the current block;
determining quantization parameter of the current block based on the color space conversion being applied; and
encoding the transformation coefficient based on the quantization parameter;
wherein the quantization parameter is derived by clipping operation based on a value of transformation skip flag of the current block;
wherein the clipping operation comprises adjusting a value of the quantization parameter to be in a range from a predetermined lower value to a predetermined upper value, inclusive,
wherein the predetermined upper value is derived based on sum of quantization parameter range offset and a predetermined constant value.