Video decoding method, video decoder, video encoding method and video encoder

A video encoding method, comprising:

• collecting a plurality of reference samples;
• grouping the reference samples to generate at least one group;
• establishing a model of the at least one group;
• obtaining a target pixel from a target block;
• selecting a target group from the at least one group according to the target pixel;
• introducing a luminance value of the target pixel into a model of the target group to predict a chromaticity value of the target pixel;
• and
• generating a coding value, the coding value having an index value.

A video decoder, comprising:

• a processor, for controlling the video decoder;
• a memory, for storing a plurality of reference samples and a target block;
• a decoding module;
• and
• an index receiving module, receiving a coding value;
• wherein, the processor, the memory, the decoding module and the index receiving module are coupled to one another;
• and the decoding module performs operations below according to an index value of the coding value:
• collecting a plurality of reference samples;
• grouping the reference samples to generate at least one group;
• establishing a model of the at least one group;
• obtaining a target pixel from a target block;
• selecting a target group from the at least one group according to the target pixel;
• and
• introducing a luminance value of the target pixel into a model of the target group to predict a chromaticity value of the target pixel.

A video encoder, comprising:

• a processor, for controlling the video encoder;
• a memory, for storing a plurality of reference samples and a target block;
• an encoding module;
• and
• an index selecting module;
• wherein, the processor, the memory, the encoding module and the index selecting module are coupled to one another;
• and the encoding module performs operations below:
• collecting a plurality of reference samples;
• grouping the reference samples to generate at least one group;
• establishing a model of the at least one group;
• obtaining a target pixel from a target block;
• selecting a target group from the at least one group according to the target pixel;
• introducing a luminance value of the target pixel into a model of the target group to predict a chromaticity value of the target pixel;
• and
• generating a coding value;
• and
• the index selecting module generates an index value from the coding value generated by the encoding module.