Patent ID: 11936892
Assignee: SHARP KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image decoding apparatus for decoding an image having coding tree units (CTUs) that are rectangular for processing, the image decoding apparatus comprising:
a decoding circuit configured to decode a tree mode parameter indicating whether a coding tree unit (CTU) is split by a single coding tree using one coding tree or is split by a separate coding tree using two or more coding trees; and
a splitting circuit configured to split a coding tree (CT) having a CT size in a case that a slice type is an intra slice, a value of the tree mode parameter indicates to use the separate coding tree, and the CT size is greater than a prescribed maximum size,
wherein the decoding circuit sets a color component parameter indicating a target color component used in a certain coding tree,
if the separate coding tree is used in the CTU, the color component parameter for a first coding tree is set equal to a parameter indicating a luminance and the color component parameter for a second coding tree is set equal to a parameter indicating chrominances Cb and Cr,
if the single coding tree is used in the CTU, the color component parameter is set equal to a parameter indicating the luminance, and the chrominances Cb and Cr.