Part123: Part-aware 3D Reconstruction from a Single-view Image

TL;DR

Part123 introduces a novel part-aware 3D reconstruction framework from a single image, leveraging diffusion models, segmentation masks, and contrastive learning to produce high-quality, segmented 3D models suitable for various applications.

Contribution

The paper proposes a new method combining diffusion models, SAM segmentation, and contrastive learning for part-aware 3D reconstruction from a single view, addressing structural and quality limitations of prior methods.

Findings

Produces high-quality, part-segmented 3D models

Outperforms existing methods in part segmentation accuracy

Enables applications like shape editing and primitive fitting

Abstract

Recently, the emergence of diffusion models has opened up new opportunities for single-view reconstruction. However, all the existing methods represent the target object as a closed mesh devoid of any structural information, thus neglecting the part-based structure, which is crucial for many downstream applications, of the reconstructed shape. Moreover, the generated meshes usually suffer from large noises, unsmooth surfaces, and blurry textures, making it challenging to obtain satisfactory part segments using 3D segmentation techniques. In this paper, we present Part123, a novel framework for part-aware 3D reconstruction from a single-view image. We first use diffusion models to generate multiview-consistent images from a given image, and then leverage Segment Anything Model (SAM), which demonstrates powerful generalization ability on arbitrary objects, to generate multiview segmentation masks. To effectively incorporate 2D part-based information into 3D reconstruction and handle inconsistency, we introduce contrastive learning into a neural rendering framework to learn a part-aware feature space based on the multiview segmentation masks. A clustering-based algorithm is also developed to automatically derive 3D part segmentation results from the reconstructed models. Experiments show that our method can generate 3D models with high-quality segmented parts on various objects. Compared to existing unstructured reconstruction methods, the part-aware 3D models from our method benefit some important applications, including feature-preserving reconstruction, primitive fitting, and 3D shape editing.