Techniques for transform kernel set selection / derivation

By determining transform kernel sets based on intra prediction mode histograms and using adaptive kernel derivation for intra and inter partitions, the method addresses inefficiencies in video coding, enhancing compression and reconstruction quality.

WO2025245162A1PCT designated stage Publication Date: 2025-11-27TENCENT AMERICA LLC
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Patent Information

Application Number
PCT/US2025/030269
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2025-05-19
Filing Date
2025-05-20
Publication Date
2025-11-27

AI Technical Summary

Technical Problem

Existing video coding technologies face inefficiencies in selecting and deriving transform kernels, particularly in intra prediction modes, leading to suboptimal compression and reconstruction of video data.

Method used

The method involves determining a transform kernel set based on a histogram of occurrence of intra prediction modes in neighboring samples of a current block and using adaptive transform kernel derivation for intra and inter partitions, allowing for improved reconstruction of video blocks.

Benefits of technology

This approach enhances video decoding efficiency by optimizing transform kernel selection, resulting in improved compression and reconstruction quality.

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Abstract

An aspect of the disclosure provides a method of video decoding. For example, a coded video bitstream is received. The coded video bitstream includes coded information of a plurality of pictures. Based on coded information of a current block in a current picture, it is determined that the current block is coded using an intra prediction that generates prediction samples of the cunent block based on reference samples in the current picture. At least a first transform kernel set is determined based on a histogram of occurrence (HoC) of intra prediction modes in neighboring samples of the current block. Based on the coded information of the current block, a residual block of the cunent block is calculated according to at least the first transform kernel set. The cunent block is reconstmcted based on the residual block and the intra prediction of the cunent block.
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Citation Information

Patent Citations

  • Video signal processing method and apparatus using scaling process

    US20220210451A1

  • Harmonized Design Among Multiple Reference Line Intra Prediction, Transform Partitioning and Transform Kernels

    US20220345690A1

  • Transform selection through block matching

    WO2024086715A1