摘要
Tofurtherimprovetheperformanceoflosslesscompressionofdynamicpointclouds a methodofgeometryinformationentropycodingunderanoctreestructurewasproposed.Bythis method forintra-framespatialcorrelation thecontextsofintra-frameneighbornodesandthe contextsofintra-frameneighborparentnodesareestablishedbasedonthecodedneighborhood informationofthecurrentoctreenode;forinter-frametemporalcorrelation thepreviouslycoded pointcloudframeisemployedasthereferenceframe andtheoctreenodeinsidethereference frameatthesamepositionasthecurrentoctreenodeisusedasthereferencenode.Theinterframecontextismodeledusingthereferencenodeanditsparentnode.Tofullyutilizethemodeledcontextsandaccuratelyestimatetheconditionalprobabilitythatthecurrentnodeisnon-emptyunderdifferentcontexts asecond-levelprobabilityestimation methodbasedontheexponential movingaveragewasproposed.Bythismethod theprobabilityisfirstestimatedunderthecontextofintra-frameneighbornodesandthecontextofintra-frameneighborparentnodes respectively.Then asetofsecond-levelcontextsaremodeledusingtheinter-framecontextsandthe resultsoftheprobabilityestimation andtheprobabilityisestimatedagainunderthesecond-level contexts.Intheend thelosslesscompressionisrealizedbythebinaryarithmeticencoder.To evaluatethecompressionperformanceoftheproposed method thecommonlyused Microsoft voxelizedupperbodies(MVUB)and8ivoxelizedfullbodies(8iVFB)datasetswereselectedfor performancetesting.Theexperimentalresultsshowthattheproposedmethodhasahigherlosslesscompressionperformancethanthemethodsdevelopedrecently Withaveragecodinggainsof 2.2%to28.7%.
| 投稿的翻译标题 | Lossless Geometry Coding Method for Dynamic Point Clouds under Octree Structure |
|---|---|
| 源语言 | 繁体中文 |
| 页（从-至） | 11-19 |
| 页数 | 9 |
| 期刊 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University |
| 卷 | 57 |
| 期 | 12 |
| DOI | |
| 出版状态 | 已出版 - 12月 2023 |
关键词
- arithmetic coding
- entropy coding
- octree
- point cloud compression
- probability estimation