Adaptive regions for decoder-side intra mode derivation and prediction

An electronic apparatus comprising:

• a video coder circuit configured to perform operations comprising:
• receiving data to be encoded or decoded as a current block of a current picture of a video;
• deriving a plurality of histograms of gradients (HoGs) for different intra prediction angles, wherein different HoGs are derived based on different sets of reconstructed pixels neighboring the current block;
• selecting a HoG from the plurality of HoGs;
• identifying one or more intra prediction modes based on the selected HoG;
• generating an intra-prediction of the current block based on the identified one or more intra prediction modes;
• and
• encoding or decoding the current block by using the generated intra-prediction.

A video decoding method comprising:

• receiving data to be decoded as a current block of a current picture of a video;
• deriving a plurality of histograms of gradients (HoGs) for different intra prediction angles, wherein different HoGs are derived based on different sets of reconstructed pixels neighboring the current block;
• selecting a HoG from the plurality of HoGs;
• identifying one or more intra prediction modes based on the selected HoG;
• generating an intra-prediction of the current block based on the identified one or more intra prediction modes;
• and
• reconstructing the current block by using the generated intra-prediction.

A video encoding method comprising:

• receiving data to be encoded as a current block of a current picture of a video into a bitstream;
• deriving a plurality of histograms of gradients (HoGs) for different intra prediction angles, wherein different HoGs are derived based on different sets of reconstructed pixels neighboring the current block;
• selecting a HoG from the plurality of HoGs;
• identifying one or more intra prediction modes based on the selected HoG;
• generating an intra-prediction of the current block based on the identified one or more intra prediction modes;
• and
• encoding the current block by using the generated intra-prediction to produce prediction residuals.