May 3, 2026 · cs.CVJ/K move · Enter open · S save
Maximilian Kellner, Dominik Merkle, Michael Brunklaus, Alexander Reiterer
Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg, 79110, Germany · University of Freiburg, Department of Sustainable Systems Engineering INATECH, Freiburg, 79110, Germany
Large-scale 3D point clouds can consist of hundreds of millions of points. Even after downsampling, these point clouds are too large for modern 3D neural networks. In order to develop a semantic understanding of the scene, the point clouds are divided into smaller subclouds that can be processed. Typically, this division is done using spherical crops, resulting in a loss of surrounding geometric context. To address this issue, we propose alternative methods that produce subclouds with larger crop sizes while maintaining a similar number of points. Specifically, we compare exponential, Gaussian, and linear cropping methods with the spherical method. We evaluated three 3D deep learning model architectures using multiple indoor and outdoor environment datasets. Our results demonstrate that altering the cropping strategy can enhance model performance, especially for large-scale outdoor scenes, yielding new state-of-the-art results. Code is available at https://github.com/mvg-inatech/point_cloud_cropping