Patent ID: 11910028
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a method of encoding blocks of a coding tree unit in an image, into a bitstream, the method comprising:
determining a chroma format of the image from a plurality of chroma formats;
encoding, into the bitstream, information of the determined chroma format of the image;
determining luma split options for a luma channel of the coding tree unit according to a size of a region in the coding tree unit;
determining chroma split options for chroma channels of the coding tree unit according to a size of a region in the coding tree unit, the chroma split options being capable of including a vertical ternary split, wherein a tree structure for the chroma channels of the coding tree unit is separate from a tree structure for the luma channel of the coding tree unit, and the vertical ternary split for a given region in the coding tree unit is not allowed in the chroma split options in a case where (a) a width of the given region is 16 samples in luma samples and (b) the determined chroma format is a 4:2:2 chroma format or a 4:2:0 chroma format; and
encoding flags used for selecting one of the determined luma split options and one of the determined chroma split options.