Patent ID: 9326005
Filing Date: 2016-04-26
CPC Classification: G06T,H04N

Claim Text:
1. An image coding method of coding an input image, the input image including one or more transform blocks each having a luma component and a chroma component, the luma component being to be processed on a basis of a luma block which belongs to a current one of the one or more transform blocks and has a same size as a size of the current transform block, the chroma component being to be processed on a basis of a chroma block which belongs to the current one of the one or more transform blocks and has a size smaller than the size of the luma block, and the image coding method comprising: deriving coefficients of the luma component by performing transform on the luma component and deriving coefficients of the chroma component by performing transform on the chroma component; and coding the coefficients of the luma component and the coefficients of the chroma component, wherein in the deriving, when the size of the current transform block is a predetermined first minimum size, the coefficients of the chroma component are derived by performing the transform on the chroma component on a basis of a block resulting from binding a plurality of the chroma blocks, the resulting block having a same size as the size of the luma block, and in the coding, when the size of the current transform block is the first minimum size, a flag indicating whether or not the coefficients of the chroma component include a non-zero coefficient is not coded, and when the size of the current transform block is a size other than the first minimum size, the flag is coded.