MF‐SDF: Neural Implicit Surface Reconstruction using Mixed Incident Illumination and Fourier Feature Optimization

Abstract The utilization of neural implicit surface as a geometry representation has proven to be an effective multi‐view surface reconstruction method. Despite the promising results achieved, reconstructing geometry from objects in real‐world scenes remains challenging due to the interaction between surface materials and complex ambient light, as well as shadow effects caused by self‐occlusion, making it a highly ill‐posed problem. To address this challenge, we propose MF‐SDF, a method that use a hybrid neural network and spherical gaussian representation to model environmental lighting, so that the model can express the situation of multiple light sources including directional light (such as outdoor sunlight) in real‐world scenarios. Benefit from this, our method effectively reconstructs coherent surfaces and accurately locates the shadow location on the surface. Furthermore, we adopt a shadow aware multi‐view photometric consistency loss, which mitigates the erroneous reconstruction results of previous methods on surfaces containing shadows, thereby improve the overall smoothness of the surface. Additionally, unlike previous approaches that directly optimize spatial features, we propose a Fourier feature optimization method that directly optimizes the tensorial feature in the frequency domain. By optimizing the high‐frequency components, this approach further enhances the details of surface reconstruction. Finally, through experiments, we demonstrate that our method outperforms existing methods in terms of reconstruction accuracy on real captured data.