Bi-predictive intra block copy with weighted averaging

Weighted averaging of prediction signals in IBC bi-prediction addresses inefficiencies in current video coding systems, enhancing coding efficiency by optimizing prediction signals for improved decoding and encoding performance.

WO2025003493A1PCT designated stage expired Publication Date: 2025-01-02INTERDIGITAL CE PATENT HOLDINGS SAS
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Patent Information

Application Number
PCT/EP2024/068393
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-30
Filing Date
2024-06-28
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

Current video coding systems face inefficiencies in intra block copy (IBC) bi-prediction due to the lack of effective methods for weighting prediction signals, which affects coding performance and compression efficiency.

Method used

The implementation of weighted averaging for prediction signals in IBC bi-prediction, where a device determines and applies weighting factors to prediction blocks based on block vector information, template matching, and rate distortion optimization to generate weighted prediction signals for improved decoding and encoding.

Benefits of technology

This approach enhances coding efficiency by optimizing prediction signals through weighted averaging, leading to improved decoding and encoding performance and better compression of video data.

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Abstract

A device may determine, for a video block, a first prediction signal associated with intra block copy (IBC) bi-prediction and a second prediction signal associated with IBC bi-prediction, apply a first weighting factor to the first prediction signal to generate a first weighted prediction signal, determine a second weighting factor based on the first weighting factor, apply the second weighting factor to the second prediction signal to generate a second weighted prediction signal, and decode the video block based on the first weighted prediction signal and the second weighted prediction signal. The device may receive an indication of a weighting factor index and determine the weighting factor based on the received indication of the weighting factor index. In some examples, the device may the weighting factor from multiple weighting factors. For example, the device may select the weighting factor from a set of weighting factors based on template matching.
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Citation Information

Patent Citations

  • Sub-block based intra block copy

    WO2020244658A1