Point cloud projection based light-to-medium G-PCC-1 hole distortion repair method for colored point cloud

Abstract

With the wide application of Colored Point Clouds(CPC), the amount of data is increasing, and efficient compression is required in practical applications. The most advanced compression technology for static CPC is the G-PCC proposed by MPEG. However, quantification errors from G-PCC-1 (Octree) can cause grid hole distortion, which can have a serious impact on the quality of user's visual perception. For this reason, this paper proposes a Point Cloud Projection based light-to-medium G-PCC-1 Hole Distortion Repair method (denoted as P-GHDR) for CPC. The distorted CPC is projected from 3D space to 2D plane, and the G-PCC-1 distorted is repaired by combining multi-view color and geometric projection maps. Finally, the repaired CPC is reconstructed by reverse projection. Experiments show that the proposed method can effectively improve the geometric and visual objective metrics of G-PCC-1 coded CPC, and can significantly improve the quality of CPC reconstructed with light-to-medium G-PCC-1 codes.