Methods and apparatus of reordering candidates for extrapolation intra prediction model inheritance in video coding

An apparatus for video coding, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive input data associated with a current block, wherein the input data comprises pixel data to be encoded at an encoder side or data associated with the current block to be decoded at a decoder side;
• derive an EIP (Extrapolated Intra Prediction) candidate list, wherein the EIP candidate list comprises one or more EIP candidates;
• reorder said one or more EIP candidates in the EIP candidate list according to model errors, wherein computation of the model errors comprises deriving prediction samples of a neighbouring template by applying one or more candidate models associated with said one or more EIP candidates to the neighbouring template of the current block, and comparing differences between reconstruction samples and the predictions samples of the neighbouring template, and wherein said deriving prediction samples of the neighbouring template, said comparing differences, or both are performed by using simplified computation;
• and
• encode or decode the current block by using information comprising the EIP candidate list, wherein if a target EIP candidate is selected, an EIP predictor of the current block is generated based on the target EIP candidate.