Abstract
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%.
| Translated title of the contribution | Lossless Geometry Coding Method for Dynamic Point Clouds under Octree Structure |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 11-19 |
| Number of pages | 9 |
| Journal | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University |
| Volume | 57 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2023 |