Method and apparatus for video coding

Abstract

A method for generating and using cross-component prediction (CCP) models for subblocks is provided. The video coder reconstructs luma samples of a current block that has a plurality of subblocks. The video coder derives a CCP model for at least one subblock of the plurality of subblocks, wherein the at least one subblock has an immediate neighboring template region that is within the current block and the reconstructed luma samples of the immediate neighboring template region is extrapolated to a neighboring template region of the current block that is outside the current block and the extrapolated samples are used to determine the CCP model of the subblock. The video coder uses the derived CCP model of the subblock to generate a cross-component prediction and uses the generated cross-component prediction to encode or decode the current block or subsequent block.

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