Learning a Room with the Occ-SDF Hybrid: Signed Distance Function Mingled with Occupancy Aids Scene Representation

• URL: http://arxiv.org/abs/2303.09152v1
• Date: Thu, 16 Mar 2023 08:34:02 GMT
• Title: Learning a Room with the Occ-SDF Hybrid: Signed Distance Function Mingled with Occupancy Aids Scene Representation
• Authors: Xiaoyang Lyu, Peng Dai, Zizhang Li, Dongyu Yan, Yi Lin, Yifan Peng, Xiaojuan Qi
• Abstract summary: Implicit neural rendering, which uses signed distance function representation with geometric priors, has led to impressive progress in the surface reconstruction of large-scale scenes. We conduct experiments to identify limitations of the original color rendering loss and priors-embedded SDF scene representation. We propose a feature-based color rendering loss that utilizes non-zero feature values to bring back optimization signals.
• Score: 46.635542063913185
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Implicit neural rendering, which uses signed distance function (SDF) representation with geometric priors (such as depth or surface normal), has led to impressive progress in the surface reconstruction of large-scale scenes. However, applying this method to reconstruct a room-level scene from images may miss structures in low-intensity areas or small and thin objects. We conducted experiments on three datasets to identify limitations of the original color rendering loss and priors-embedded SDF scene representation. We found that the color rendering loss results in optimization bias against low-intensity areas, causing gradient vanishing and leaving these areas unoptimized. To address this issue, we propose a feature-based color rendering loss that utilizes non-zero feature values to bring back optimization signals. Additionally, the SDF representation can be influenced by objects along a ray path, disrupting the monotonic change of SDF values when a single object is present. To counteract this, we explore using the occupancy representation, which encodes each point separately and is unaffected by objects along a querying ray. Our experimental results demonstrate that the joint forces of the feature-based rendering loss and Occ-SDF hybrid representation scheme can provide high-quality reconstruction results, especially in challenging room-level scenarios. The code would be released.

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