Efficient Point Cloud Reconstruction and Denoising via Learned Gaussian Splats and Fine-Tuned Diffusion Features

Główne pojęcia

The authors propose a method to reconstruct point clouds from few images and denoise point clouds from their rendering by exploiting prior knowledge distilled from image-based deep learning models.

Streszczenie

The key highlights and insights of the content are:

1. Existing deep learning methods for point cloud reconstruction and denoising rely on small datasets of 3D shapes. The authors circumvent this problem by leveraging deep learning methods trained on billions of images.

2. The authors propose a hybrid surface-appearance differentiable renderer that models normals and appearances using per-point spherical harmonics coefficients. This allows them to address shape reconstruction with changing lighting conditions.

3. To improve reconstruction in constraint settings, the authors introduce a semantic consistency regularization term that compares renderings of the point cloud from unseen camera poses with embeddings obtained from ground truth views.

4. The authors propose a diffusion-based network to denoise a wide variety of noise types from point cloud renderings. This is more robust to point cloud colors and lighting conditions compared to a GAN-based approach.

5. The authors show improved few-shot 3D shape reconstruction using semantic regularization and achieve similar quality to state-of-the-art methods while using less training images. They also demonstrate better point cloud denoising performance compared to a GAN-based network.

Statystyki

"Existing deep learning methods for the reconstruction and denoising of point clouds rely on small datasets of 3D shapes."
"We are able to improve few-shot 3D shape reconstruction using semantic regularization and obtain similar quality compared to DSS while using less images for training."
"Our diffusion-based method to denoise point clouds without 3D supervision showed improvements in a wide variety of denoising task compared to a GAN-based networks."

Cytaty

"We circumvent the problem by leveraging deep learning methods trained on billions of images."
"To improve reconstruction in constraint settings, we regularize the training of a differentiable renderer with hybrid surface and appearance by introducing semantic consistency supervision."
"Our diffusion-based point cloud denoising network removes noise from the latent encoding of point cloud renderings and effectively backpropagates image changes to the geometry domain."

Kluczowe wnioski z

Few shot point cloud reconstruction and denoising via learned Guassian splats renderings and fine-tuned diffusion features

by Pietro Bonaz... o arxiv.org 04-02-2024

https://arxiv.org/pdf/2404.01112.pdf

Głębsze pytania

How can the proposed semantic consistency regularization be extended to handle more complex scene-level reconstruction tasks beyond single object reconstruction

The proposed semantic consistency regularization can be extended to handle more complex scene-level reconstruction tasks beyond single object reconstruction by incorporating multi-object interactions and scene context. This extension would involve encoding relationships between objects in the scene, such as spatial arrangements, occlusions, and interactions. By leveraging semantic consistency across multiple objects and their surroundings, the regularization can guide the reconstruction process to maintain structural coherence and consistency within the entire scene. Additionally, incorporating higher-level semantic information, such as object categories and functional relationships, can further enhance the reconstruction accuracy and completeness in complex scenes.

What are the potential limitations of the diffusion-based denoising approach, and how could it be further improved to handle a wider range of noise types and point cloud characteristics

The diffusion-based denoising approach, while effective, may have limitations in handling certain noise types and point cloud characteristics. One potential limitation is the sensitivity to noise distribution and intensity, which can impact the denoising performance. To address this, the approach could be further improved by incorporating adaptive noise modeling techniques that can dynamically adjust to different noise levels and distributions. Additionally, integrating multi-scale processing and context-aware filtering mechanisms can enhance the denoising capabilities for a wider range of noise types and point cloud characteristics. Furthermore, exploring advanced diffusion models with enhanced learning capabilities and adaptive filtering strategies could improve the robustness and generalization of the denoising approach.

Given the reliance on large-scale image datasets, how could the proposed framework be adapted to settings with limited or no access to such datasets, and what alternative sources of prior knowledge could be leveraged

In settings with limited or no access to large-scale image datasets, the proposed framework can be adapted by leveraging alternative sources of prior knowledge, such as synthetic data, domain-specific knowledge, or transfer learning from related tasks. Synthetic data generation techniques can be used to create diverse training data for scene reconstruction and denoising tasks. Domain-specific knowledge, such as geometric priors, physical constraints, and scene semantics, can be incorporated into the learning process to guide the reconstruction and denoising algorithms. Transfer learning from related tasks, such as image segmentation or object detection, can provide valuable insights and priors for point cloud reconstruction and denoising. By adapting the framework to utilize these alternative sources of prior knowledge, the model can learn effectively even in settings with limited access to large-scale image datasets.