# Point-Cloud Completion with Pretrained Text-to-image Diffusion Models

**Authors:** Yoni Kasten, Ohad Rahamim, Gal Chechik  
**arXiv:** [2306.10533](https://arxiv.org/abs/2306.10533)  
**Date:** 2023-06-18  
**Summary page:** https://www.summarizepaper.com/en/paper/2306.10533v1/

## 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.

## Summary

The paper "Point-Cloud Completion with Pretrained Text-to-image Diffusion Models" by Yoni Kasten, Ohad Rahamim, and Gal Chechik addresses the problem of incomplete point-cloud data in real-world applications. Incomplete data can result from objects being observed from partial viewpoints or 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, but they perform poorly when tested on Out-Of-Distribution (OOD) objects that are not well represented in the training dataset. To address this issue, the authors leverage recent advances in text-guided image generation to develop an approach called SDS Complete. This approach 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. 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. Overall, this paper presents an innovative approach to completing point cloud data using text guided image generation techniques. The results demonstrate its effectiveness in addressing the challenges posed by OOD objects and incomplete data in real world applications.