Encoding method, decoding method, encoding/decoding system, encoder, and decoder

A decoder, comprising:

• a processor circuit, receiving a flag corresponding to a coding unit block in a palette mode,
• wherein if the flag is a first state value, the processor circuit determines that an amount of indexes corresponding to the coding unit block is an amount of one or more major colors of the coding unit block,
• wherein if the flag is a second state value, the processor circuit determines that the amount of the indexes corresponding to the coding unit block is the amount of the one or more major colors of the coding unit block plus one,
• wherein the amount of the one or more major colors corresponding to the coding unit block plus one is equal to a total number of index values of the one or more major colors recorded in the palette table plus one.

A system for encoding and decoding, comprising:

• a decoder, receiving a flag corresponding to a coding unit block having a plurality of pixels in a palette mode,
• wherein if the flag is a first state value, the decoder determines that an amount of indexes corresponding to the coding unit block is an amount of one or more major colors of the coding unit block,
• wherein if the flag is a second state value, the decoder determines that the amount of the indexes corresponding to the coding unit block is the amount of the one or more major colors of the coding unit block plus one,
• wherein the amount of the one or more major colors corresponding to the coding unit block plus one is equal to a total number of index values of the one or more major colors recorded in the palette table plus one.