Method and apparatus of palette mode coding for colour video data

A method of video encoding and decoding used by a video encoding system and video decoding system respectively, the method comprising:

• receiving input data associated with a current image, wherein the current image comprises a luma component and one or more chroma components;
• partitioning the luma component and said one or more chroma components of the current image separately into luma blocks and chroma blocks using separate coding unit (CU) structures;
• and
• applying palette mode coding to the luma blocks using luma palettes if the palette mode is selected for the luma blocks and applying palette mode coding to the chroma blocks using chroma palettes if the palette mode is selected for the chroma blocks.

An apparatus of video encoding and decoding used by a video encoding system and video decoding system respectively, the apparatus comprising one or more electronic circuits or processors arrange to:

• receive input data associated with a current image, wherein the current image comprises a luma component and one or more chroma components;
• partition the luma component and said one or more chroma components of the current image separately into luma blocks and chroma blocks using separate coding unit (CU) structures;
• and
• apply palette mode coding to the luma blocks using luma palettes if the palette mode is selected for the luma blocks and apply palette mode coding to the chroma blocks using chroma palettes if the palette mode is selected for the chroma blocks.