No reference image quality assessment based decoder side intra prediction

A decoder comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the decoder to:
• receive, from a bitstream for a block:
• an indication of decoder-side-prediction of an intra prediction mode, wherein a first value of the indication indicates that the intra prediction mode is to be determined by the decoder and a second value of the indication indicates that the intra prediction mode is to be determined from the bitstream;
• and
• a reconstructed residual block;
• based on the indication having the first value,
• generate a plurality of reconstructed blocks for a plurality of intra prediction modes, wherein each reconstructed block of the plurality of reconstructed blocks is generated based on:
• a prediction block generated for a respective intra prediction mode of the plurality of intra prediction modes;
• and
• the reconstructed residual block;
• select, by the decoder, a prediction mode, from the plurality of intra prediction modes, as the intra prediction mode of the block based on
• a visual quality of each of the plurality of reconstructed blocks;
• and
• decode the block based on the intra prediction mode.

A non-transitory computer-readable medium storing instructions that, when executed by one or more processors of a decoder, cause the decoder to:

• receive, from a bitstream for a block:
• an indication of decoder-side-prediction of an intra prediction mode, wherein a first value of the indication indicates that the intra prediction mode is to be determined by the decoder and a second value of the indication indicates that the intra prediction mode is to be determined from the bitstream;
• and
• a reconstructed residual block;
• based on the indication having the first value,
• generate a plurality of reconstructed blocks for a plurality of intra prediction modes, wherein each reconstructed block of the plurality of reconstructed blocks is generated based on:
• a prediction block generated for a respective intra prediction mode of the plurality of intra prediction modes;
• and
• the reconstructed residual block;
• select a prediction mode, from the plurality of intra prediction modes, as the intra prediction mode of the block based on
• a visual quality of each of the plurality of reconstructed blocks;
• and
• decode the block based on the intra prediction mode.