Method and apparatus for video coding

An apparatus for video encoding, comprising:

• processing circuitry configured to:
• calculate filter coefficients of a filter operation including calculating (i)) first filter coefficients based on one or more rows of neighboring reconstructed samples above a current block to be encoded and one or more rows of neighboring reconstructed samples above a reference block of the current block, or (ii) second filter coefficients based on one or more columns of neighboring reconstructed samples left of the current block and one or more columns of neighboring reconstructed samples left of the reference block;
• apply the filter operation with the filter coefficients calculated based on the neighboring reconstructed samples of the current block and the neighboring reconstructed samples of the reference block to plural reference samples of the reference block by multiplying each reference sample and neighboring samples of the reference sample with a respective calculated filter coefficient of the filter operation and summing the multiplied reference sample with the multiplied neighboring samples to generate a corresponding filtered reference sample;
• determine a prediction block for the current block based on the filtered reference samples of the reference block;
• and
• encode the current block based on the prediction block of the current block.

A method of processing visual media data, the method comprising:

• processing a bitstream of the visual media data according to a format rule, wherein
• the bitstream includes coded information of a current block that is a part of a current picture in a video bitstream, the coded information indicating a reference block for the current block,
• the format rule specifies that filter coefficients of a filter operation are calculated including calculating (i) first filter coefficients based on one or more rows of neighboring reconstructed samples above the current block and one or more rows of neighboring reconstructed samples above the reference block, or (ii) second filter coefficients based on one or more columns of neighboring reconstructed samples left of the current block and one or more columns of neighboring reconstructed samples left of the reference block;
• the format rule specifies that the filter operation with the filter coefficients calculated based on the neighboring reconstructed samples of the current block and the neighboring reconstructed samples of the reference block is applied to plural reference samples of the reference block by multiplying each reference sample and neighboring samples of the reference sample with a respective calculated filter coefficient of the filter operation and summing the multiplied reference sample with the multiplied neighboring samples to generate a corresponding filtered reference sample;
• the format rule specifies that a prediction block is determined for the current block based on the filtered reference samples of the reference block;
• and
• the format rule specifies that the current block is reconstructed based on the prediction block of the current block.