Method and apparatus for encoding and decoding an image or video

The cross-component model addresses the inefficiency in predicting chroma samples by using modified reference areas and selected samples, resulting in improved video compression efficiency.

JP2025522408APending Publication Date: 2025-07-15INTERDIGITALCE PATENT HLDG SAS
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Patent Information

Application Number
JP2024573175
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-09-30
Filing Date
2023-06-20
Publication Date
2025-07-15

AI Technical Summary

Technical Problem

Existing video coding methods struggle to efficiently utilize cross-component redundancy between luma and chroma samples, leading to suboptimal compression efficiency.

Method used

A cross-component model is employed to predict chroma samples based on reconstructed luma samples, where the reference area is modified according to block characteristics, and the model is derived using selected reference luma and chroma samples within a specified range.

Benefits of technology

Improves video compression efficiency by accurately predicting chroma samples, reducing redundancy and enhancing encoding and decoding performance.

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Abstract

A method and apparatus for encoding and decoding blocks of an image or video, wherein chroma samples of a block are intra-predicted using a cross-component model and reconstructed luma samples of the block. The cross-component model is obtained for the block based on a reference area modified according to at least one characteristic of the block. In one embodiment, reconstructed luma and chroma samples within the reference area are selected to derive the cross-component model based on the reconstructed luma samples of the block. In another embodiment, the reference area is modified based on an indicator signaled for the block.
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