Drone-assisted Road Gaussian Splatting with Cross-view Uncertainty

TL;DR

This paper introduces a novel uncertainty-aware training method for 3D Gaussian Splatting that leverages aerial drone imagery to improve large-scale road scene rendering, addressing view disparity challenges.

Contribution

It proposes the first cross-view uncertainty mechanism to integrate aerial and ground images in 3D-GS training, enhancing scene reconstruction and rendering quality.

Findings

Improved synthesis of large-scale road scenes with aerial data.

Enhanced view consistency and scene completeness.

Effective handling of view disparity in neural rendering.

Abstract

Robust and realistic rendering for large-scale road scenes is essential in autonomous driving simulation. Recently, 3D Gaussian Splatting (3D-GS) has made groundbreaking progress in neural rendering, but the general fidelity of large-scale road scene renderings is often limited by the input imagery, which usually has a narrow field of view and focuses mainly on the street-level local area. Intuitively, the data from the drone's perspective can provide a complementary viewpoint for the data from the ground vehicle's perspective, enhancing the completeness of scene reconstruction and rendering. However, training naively with aerial and ground images, which exhibit large view disparity, poses a significant convergence challenge for 3D-GS, and does not demonstrate remarkable improvements in performance on road views. In order to enhance the novel view synthesis of road views and to effectively use the aerial information, we design an uncertainty-aware training method that allows aerial images to assist in the synthesis of areas where ground images have poor learning outcomes instead of weighting all pixels equally in 3D-GS training like prior work did. We are the first to introduce the cross-view uncertainty to 3D-GS by matching the car-view ensemble-based rendering uncertainty to aerial images, weighting the contribution of each pixel to the training process. Additionally, to systematically quantify evaluation metrics, we assemble a high-quality synthesized dataset comprising both aerial and ground images for road scenes.