US Patent 10326986 Intra video coding using a decoupled tree structure

Processing circuitry of a device is configured to determine that a plurality of derived modes (DMs) available for predicting a luma block of video data are also available for predicting a chroma block of the video data, the chroma block corresponding to the luma block, to form a candidate list of prediction modes with respect to the chroma block, the candidate list including one or more DMs of the multiple DMs, to determine to code the chroma block using any DM of the candidate list. The processing circuitry may, based on the determination to code the chroma block using any DM of the one or more DMs of the candidate list, code an indication identifying a selected DM of the candidate list to be used for coding the chroma block. The processing circuitry may code the chroma block according to the selected DM of the candidate list.