Method and apparatus for video encoding and decoding with signaling of coding type or coding tree type

A method, comprising:

• decoding at least one syntax data element related to a coding tree type of at least one region of a picture, wherein the coding tree type is one of dual or joint, a dual coding tree type indicating two separate coding syntax structure for luma and chroma components, a joint coding tree type indicating a coding syntax structure commonly used for luma and chroma components, and wherein a region of a picture is one of a tile, a coding tree unit CTU, a rectangular region of the picture wherein a same coding tree type is used for luma and chroma components of the rectangular region;
• obtaining a coding type of the at least one region of a picture, said coding type being one of Intra coding or Inter coding;
• and
• decoding luma and chroma components of the at least one region of a picture according to the coding type and coding tree type.

An apparatus comprising a memory and one or more processors configured to:

• decode at least one syntax data element related to a coding tree type of at least one region of a picture, wherein the coding tree type is one of dual or joint, a dual coding tree type indicating two separate coding syntax structure for luma and chroma components, a joint coding tree type indicating a coding syntax structure commonly used for luma and chroma components, and wherein a region of a picture is one of a tile, a coding tree unit CTU, a rectangular region of the picture wherein a same coding tree type is used for luma and chroma components of the rectangular region;
• obtain a coding type of the at least one region of a picture, said coding type being one of Intra coding or Inter coding;
• and
• decode luma and chroma components of the at least one region of a picture according to the coding type and coding tree type.

A method, comprising:

• encoding at least one syntax data element related to a coding tree type of at least one region of a picture, wherein the coding tree type is one of dual or joint, a dual coding tree type indicating two separate coding syntax structure for luma and chroma components, a joint coding tree type indicating a coding syntax structure commonly used for luma and chroma components, and wherein a region of a picture is one of a tile, a coding tree unit CTU, a rectangular region of the picture wherein a same coding tree type is used for luma and chroma components of the rectangular region;
• obtaining a coding type of the at least one region of a picture, said coding type being one of is one of Intra coding or Inter coding;
• and
• encoding luma and chroma components of the at least one region of a picture according to the coding type and coding tree type.

An apparatus comprising a memory and one or more processors configured to:

• encode at least one syntax data element related to a coding tree type of at least one region of a picture, wherein the coding tree type is one of dual or joint, a dual coding tree type indicating two separate coding syntax structure for luma and chroma components, a joint coding tree type indicating a coding syntax structure commonly used for luma and chroma components, and wherein a region of a picture is one of a tile, a coding tree unit CTU, a rectangular region of the picture wherein a same coding tree type is used for luma and chroma components of the rectangular region;
• obtain a coding type of the at least one region of a picture, said coding type being one of is one of Intra coding or Inter coding;
• and
• encode luma and chroma components of the at least one region of a picture according to the coding type and coding tree type.