Impact of Conventional and Deep Learning-based Point Cloud Geometry Coding on Deep Learning-based Classification Performance
Rodrigues, Nuno M. M.
Impact of Conventional and Deep Learning-based Point Cloud Geometry Coding on Deep Learning-based Classification Performance, Proc IEEE International Symposium on Multimedia (ISM) , Naples, Italy, Vol. , pp. - , December, 2022.
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Deep learning (DL)-based point cloud (PC) classification is a key computer vision task for many applications, notably autonomous driving, surveillance, and cultural heritage. In many application scenarios, PCs must be coded to reach practical rates for storage and transmission purposes, and thus they suffer from more or less intense compression artifacts. After the specification of two MPEG PC coding standards, DL-based PC coding has gained momentum, reaching competitive compression performance, especially for dense PCs. Since using decoded PCs, which may suffer from compression artifacts, may impact the final classification performance, the main goal of this paper is to study the impact of static PC geometry coding on DL-based classification. This study is performed on the ModelNet40 test dataset using the conventional G-PCC coding standard and the DL-based PC geometry codec which was the top performing solution responding to the recent JPEG Pleno PC Coding Call for Proposals. Two highly performing DL-based classifiers are used, considering the original PC geometry before and after voxelization, as well as the decoded PC geometry for different rates and qualities. As expected, coding has an impact on the classification performance, especially for the lower rates/qualities. For very sparse PCs, conventional coding still has advantage, contrarily to dense PCs, but this should change in the future with DL-based tools becoming the most natural solutions for both PC geometry coding and classification.