Point-Cloud Completion with Pretrained Text-to-image Diffusion Models
Authors: Yoni Kasten, Ohad Rahamim, Gal Chechik
AI-generated Key Points
- The paper addresses the problem of incomplete point-cloud data in real-world applications.
- Existing completion approaches rely on datasets of predefined objects, but they perform poorly when tested on Out-Of-Distribution (OOD) objects that are not well represented in the training dataset.
- The authors leverage recent advances in text-guided image generation to develop an approach called SDS Complete.
- SDS Complete uses a pre-trained text-to-image diffusion model and leverages the text semantics of a given incomplete point cloud to obtain a complete surface representation.
- SDS Complete can complete a variety of objects using test time optimization without expensive collection of 3D information.
- The authors evaluate SDS Complete on incomplete scanned objects captured by real world depth sensors and LiDAR scanners.
- They find that it effectively reconstructs objects that are absent from common datasets, reducing Chamfer loss by 50% on average compared with current methods.
Abstract: Point-cloud data collected in real-world applications are often incomplete. Data is typically missing due to objects being observed from partial viewpoints, which only capture a specific perspective or angle. Additionally, data can be incomplete due to occlusion and low-resolution sampling. Existing completion approaches rely on datasets of predefined objects to guide the completion of noisy and incomplete, point clouds. However, these approaches perform poorly when tested on Out-Of-Distribution (OOD) objects, that are poorly represented in the training dataset. Here we leverage recent advances in text-guided image generation, which lead to major breakthroughs in text-guided shape generation. We describe an approach called SDS-Complete that uses a pre-trained text-to-image diffusion model and leverages the text semantics of a given incomplete point cloud of an object, to obtain a complete surface representation. SDS-Complete can complete a variety of objects using test-time optimization without expensive collection of 3D information. We evaluate SDS Complete on incomplete scanned objects, captured by real-world depth sensors and LiDAR scanners. We find that it effectively reconstructs objects that are absent from common datasets, reducing Chamfer loss by 50% on average compared with current methods. Project page: https://sds-complete.github.io/
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