Abstract:Geometrical structures and the internal local region relationship, such as symmetry, regular array, junction, etc., are essential for understanding a 3D shape. This paper proposes a point cloud feature extraction network named PointSCNet, to capture the geometrical structure information and local region correlation information of a point cloud. The PointSCNet consists of three main modules: the space-filling curve-guided sampling module, the information fusion module, and the channel-spatial attention module. … Show more
“…PointSCNet [177] captures the geometrical structure and local region correlation of a point cloud using three key components: a space-filling curve-guided sampling module, an information fusion module, and a channel-spatial attention module. The sampling module selects points with geometrical correlation using Z-order curve coding.…”
Point cloud analysis has a wide range of applications in many areas such as computer vision, robotic manipulation, and autonomous driving. While deep learning has achieved remarkable success on image-based tasks, there are many unique challenges faced by deep neural networks in processing massive, unordered, irregular and noisy 3D points. To stimulate future research, this paper analyzes recent progress in deep learning methods employed for point cloud processing and presents challenges and potential directions to advance this field. It serves as a comprehensive review on two major tasks in 3D point cloud processing-namely, 3D shape classification and semantic segmentation.
“…PointSCNet [177] captures the geometrical structure and local region correlation of a point cloud using three key components: a space-filling curve-guided sampling module, an information fusion module, and a channel-spatial attention module. The sampling module selects points with geometrical correlation using Z-order curve coding.…”
Point cloud analysis has a wide range of applications in many areas such as computer vision, robotic manipulation, and autonomous driving. While deep learning has achieved remarkable success on image-based tasks, there are many unique challenges faced by deep neural networks in processing massive, unordered, irregular and noisy 3D points. To stimulate future research, this paper analyzes recent progress in deep learning methods employed for point cloud processing and presents challenges and potential directions to advance this field. It serves as a comprehensive review on two major tasks in 3D point cloud processing-namely, 3D shape classification and semantic segmentation.
“…are 3D 'Voxel', 2D 'Image', or un-ordered array of 'XYZ' 3D point cloud. [60], [61], [62], [63] use normals or mesh information. [64] is pre-trained on ImageNet.…”
Section: B 3d Object Classification Modelsmentioning
Recently, 3D computer vision has greatly emerged and become essential topic in both research and industry applications. Yet large scale 3D benchmark like ImageNet is not available for many 3D computer vision tasks such as 3D object recognition, 3D body motion recognition, and 3D scene understanding. Existing 3D benchmarks are not enough in the number of classes and quality of data samples, and reported performances on the datasets are nearly saturated. Furthermore, 3D data obtained with existing 3D sensors are noisy and incomplete causing unreliable evaluation results. In this work, we revisit the effectiveness of existing 3D computer vision benchmarks. We propose to refine and re-organize existing benchmarks to provide cheap and easy access but challenging, effective and reliable evaluation schemes. Our task includes data refinement, class category adjusting, and improved evaluation protocols. Biased benchmark subsets and new challenges are suggested. Our experimental evaluations on ModelNet40, a 3D object recognition benchmark, show that our revised benchmark datasets (MN40-CR and MN20-CB) provide improved indicators for performance comparison and reveals new aspects of existing methods. State-ofthe-art 3D object classification and data augmentation methods are evaluated on MN40-CR and MN20-CB. Based on our extensive evaluation, we conclude that existing benchmarks that are carefully re-organized are good alternatives of large scale benchmark which is very expensive to build and difficult to guarantee data quality under immature 3D data acquisition environment. We make our new benchmarks and evaluations public.
INDEX TERMS benchmark, dataset, point cloud, 3DI. INTRODUCTION
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