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arXiv · 2209.02226

Learning to Predict on Octree for Scalable Point Cloud Geometry Coding

Yixiang Mao·Yueyu Hu·Yao Wang
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Abstract

Octree-based point cloud representation and compression have been adopted by the MPEG G-PCC standard. However, it only uses handcrafted methods to predict the probability that a leaf node is non-empty, which is then used for entropy coding. We propose a novel approach for predicting such probabilities for geometry coding, which applies a denoising neural network to a "noisy" context cube that includes both neighboring decoded voxels as well as uncoded voxels. We further propose a convolution-based model to upsample the decoded point cloud at a coarse resolution on the decoder side. Integration of the two approaches significantly improves the rate-distortion performance for geometry coding compared to the original G-PCC standard and other baseline methods for dense point clouds. The proposed octree-based entropy coding approach is naturally scalable, which is desirable for dynamic rate adaptation in point cloud streaming systems.

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Yixiang Mao, Yueyu Hu, Yao Wang. 2022-09-06. Learning to Predict on Octree for Scalable Point Cloud Geometry Coding. https://arxiv.org/abs/2209.02226

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