Neural Shortest Path for Surface Reconstruction from Point Clouds
This addresses the problem of accurate 3D surface modeling for applications like computer graphics and robotics, offering a novel approach that is incremental in improving existing implicit neural representations.
The paper tackles surface reconstruction from point clouds by proposing the neural shortest path (NSP), a method that learns the exact shortest path to approximate distance functions and gradients, resulting in high-quality reconstructions with robustness to noise and sparsity, as shown by substantial improvements over state-of-the-art methods in experiments.
In this paper, we propose the neural shortest path (NSP), a vector-valued implicit neural representation (INR) that approximates a distance function and its gradient. The key feature of NSP is to learn the exact shortest path (ESP), which directs an arbitrary point to its nearest point on the target surface. The NSP is decomposed into its magnitude and direction, and a variable splitting method is used that each decomposed component approximates a distance function and its gradient, respectively. Unlike to existing methods of learning the distance function itself, the NSP ensures the simultaneous recovery of the distance function and its gradient. We mathematically prove that the decomposed representation of NSP guarantees the convergence of the magnitude of NSP in the $H^1$ norm. Furthermore, we devise a novel loss function that enforces the property of ESP, demonstrating that its global minimum is the ESP. We evaluate the performance of the NSP through comprehensive experiments on diverse datasets, validating its capacity to reconstruct high-quality surfaces with the robustness to noise and data sparsity. The numerical results show substantial improvements over state-of-the-art methods, highlighting the importance of learning the ESP, the product of distance function and its gradient, for representing a wide variety of complex surfaces.