High dynamic range (HDR) novel view synthesis (NVS) aims to create
photorealistic images from novel viewpoints using HDR imaging techniques. The
rendered HDR images capture a wider range of brightness levels containing more
details of the scene than normal low dynamic range (LDR) images. Existing HDR
NVS methods are mainly based on NeRF. They suffer from long training time and
slow inference speed. In this paper, we propose a new framework, High Dynamic
Range Gaussian Splatting (HDR-GS), which can efficiently render novel HDR views
and reconstruct LDR images with a user input exposure time. Specifically, we
design a Dual Dynamic Range (DDR) Gaussian point cloud model that uses
spherical harmonics to fit HDR color and employs an MLP-based tone-mapper to
render LDR color. The HDR and LDR colors are then fed into two Parallel
Differentiable Rasterization (PDR) processes to reconstruct HDR and LDR views.
To establish the data foundation for the research of 3D Gaussian
splatting-based methods in HDR NVS, we recalibrate the camera parameters and
compute the initial positions for Gaussian point clouds. Experiments
demonstrate that our HDR-GS surpasses the state-of-the-art NeRF-based method by
3.84 and 1.91 dB on LDR and HDR NVS while enjoying 1000x inference speed and
only requiring 6.3% training time.

使用高动态范围高斯点云模型和多层感知器（MLP）调制，建立了一种新的高动态范围高斯喷点（HDR-GS）框架，以有效渲染新的高动态范围（HDR）视图和重建低动态范围（LDR）图像，并通过两个并行可微光栅化（PDR）过程对 HDR 和 LDR 视图进行重建。实验证明，该方法在 LDR 和 HDR NVS 上分别超过了现有的 NeRF 方法 3.84 和 1.91 dB，同时拥有 1000 倍的推理速度和仅需 6.3％的训练时间。