Section: New Results
3D completion and surface modeling
Participants : Raoul de Charette, Maximilian Jaritz, Manohar Kv.
Depth sensors (LiDARs, Time-of-flight cameras, stereo) gather geometrical knowledge about the scene which are rich and may be beneficial for many tasks. However, the depth information is usually sparse in nature and do not recover volumes and surfaces of objects.
This year we have conducted three works on the topic: one work to densify the 3D point clouds generated from LiDAR sensors, another work to fuse 2D images and 3D point clouds, and finalized another work to reconstruct 3D deformable objects.
The first work is in spirit a 3D point completion and was initiated with intern Manohar Kv. We developed a 3D pipeline to process point cloud and densify existing point clouds. It uses a modified version of the popular PointNet++ and it is thus able to reconstruct highly occluded 3D point clouds. The work is not yet published.
In  we introduce a framework to fuse 2D multi-view images and 3D point clouds in an effective way by computing image features in 2D first, lifting them to 3D, and then fuse complementary geometry and image information in canonical 3D space. This work has been done while Maximilian Jaritz was visiting San Diego University.
In , we propose a new algorithm to reconstruct 3D deformable objects heavily occluded. It uses an automatic registration of multiple depth sensors and Gaussian Mixture Modeling in the radial domain to detect and reconstruct object from their symmetrical properties. This research was applied in the context of pottery wheel for the preservation of the cultural heritage and conducted in collaboration with Mines ParisTech. It resulted that our method enabled reconstruction of challenging deformable objects with an average precision of 7.6mm.