Decoder-side intra mode derivation merge

EP4771850A1Pending Publication Date: 2026-07-08INTERDIGITAL CE PATENT HOLDINGS SAS
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Patent Information

Application Number
EP2024783203
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-28
Filing Date
2024-09-27
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Existing video coding systems face challenges in efficiently encoding and decoding video signals, particularly in deriving accurate intra prediction modes for current blocks, which affects compression efficiency and quality.

Method used

The proposed solution involves a decoder-side intra mode derivation merge mode that uses reference samples with associated histograms of gradients. These histograms are scaled based on the distances between the reference samples and the current block, and then merged to derive a single histogram of gradients. This merged histogram is used to decode the current block, improving prediction accuracy.

Benefits of technology

The approach enhances the accuracy of intra prediction modes, leading to improved video decoding quality and compression efficiency by effectively utilizing neighboring blocks' information.

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Abstract

System, methods, and instrumentalities are disclosed for encoding and decoding in a decoderside intra mode derivation (DIMD) merge mode. An example device may determine a first reference sample associated with a first histogram of gradients and a second reference sample associated with a second histogram of gradients. The device may scale the first histogram of gradients based on a distance between the first reference sample and the current block and scale the second histogram of gradients based on a distance between the second reference sample and the current block. The device may derive a merged histogram of gradients based on the scaled first and second histograms of gradients and derive an intra prediction mode based on the merged histogram of gradients. The device may obtain a prediction of the current block based on the intra prediction mode and decode the current block based on the prediction.
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