Multi-Reference Frames-Based Occupancy Information Difference and Correlation Entropy Coding for MPEG G-PCC

Chuang Ma

doi:10.1109/tcsvt.2026.3673689

Multi-Reference Frames-Based Occupancy Information Difference and Correlation Entropy Coding for MPEG G-PCC

2026-07-01

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DOI：10.1109/tcsvt.2026.3673689

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Efficient compression of massive 3D point clouds remains challenging under limited storage and bandwidth. The Moving Picture Experts Group (MPEG) has developed the geometry-based point cloud compression (G-PCC) standard and is currently at the FDIS stage, referred to as Enhanced G-PCC. This paper proposes a novel inter prediction attribute coding based on the Region Adaptive Hierarchical Transform (RAHT) and entropy coding framework to enhance the coding efficiency. 1) Multi-Reference Frames: A low-delay prediction architecture is introduced to improve temporal correlation utilization, which has not yet been explored in G-PCC inter RAHT attribute compression, with a lightweight motion-based switch to disable multi-reference prediction for large motion. 2) Occupancy Information Difference: The inter eligibility based on occupancy information difference scheme is employed to select valid inter reference blocks, while hybrid prediction scheme based on occupancy information difference is further introduced to enhance prediction accuracy. 3) Correlation Entropy Coding: A new entropy coder is developed to exploit the intrinsic correlation among color components. By jointly leveraging these techniques, the proposed method efficiently exploits spatial and temporal regularities of dynamic point clouds, achieving significant performance gains. Experimental results show that it outperforms the state-of-the-art Enhanced G-PCC reference software (TMC13-v31), with average coding gains of 3.17% for reflectance on the Cat3 dataset and 2.81%, 16.92%, and 12.21% for the Luma, Cb, and Cr components on the Cat2 dataset under MPEG common test conditions. The method, Occupancy Information Difference, has already been adopted into the MPEG Enhanced G-PCC standard.

Keywords:

Encoding

Point cloud compression

Transforms

Geometry

Correlation

Transform coding

Standards

Three-dimensional displays

High frequency

Octrees

G-PCC

RAHT

multi-reference frames

occupancy information difference

correlation entropy coding

Multi-Reference Frames-Based Occupancy Information Difference and Correlation Entropy Coding for MPEG G-PCC

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