Diversifying decoder-side intra mode derivation merge candidates

By introducing a decoder-side intra-frame mode derivation merging candidate diversification technique, the problem of lack of diversity in intra-frame mode derivation is solved, improving the efficiency of video coding and decoding quality, and achieving more efficient video sequence compression.

CN122743752APending Publication Date: 2026-09-11OFINNO LLC
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Patent Information

Application Number
CN202480086962.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-12-31
Filing Date
2024-12-31
Publication Date
2026-09-11

AI Technical Summary

Technical Problem

Existing video coding technologies lack diversity in intra-frame mode derivation, resulting in poor coding efficiency and decoding quality.

Method used

We employ a decoder-side intra-frame mode derivation (DIMD) candidate diversification technique, using methods such as histogram of gradients (HoG) and multiple reference rows (MRL) to enhance the diversity and accuracy of intra-frame mode derivation.

Benefits of technology

It improves the efficiency of video encoding and decoding quality, reduces redundant information, and enhances the compression effect of video sequences.

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Abstract

The video encoder determines, based on a first indication of the decoder-side intra-frame mode derivation (DIMD) prediction mode that is being enabled to encode the current block, a first gradient histogram (HoG) based on the current block, and a second HoG based on neighboring blocks. A value representing the similarity between the first HoG and the second HoG is determined. For the DIMD prediction mode, a set of parameters is selected from a first set of parameters and a second set of parameters based on comparing the value with a threshold. The encoder encodes the current block using a DIMD prediction factor generated based on the first set of parameters.
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