GaussHDR: High Dynamic Range Gaussian Splatting via Learning Unified 3D and 2D Local Tone Mapping

Inaccurate HDR Rendering 𝑧 (depth) 𝑧 (depth) Training with 3D Tone Mapping HDR Rendering Training with 2D Tone Mapping HDR ray Tone mapping Render LDR ray LDR pixel Loss HDR ray Tone mapping Render HDR pixel LDR pixel Loss LDR RMSE: 0.032 LDR RMSE: 0.054 Figure 1. 3D tone mapping vs. 2D tone mapping. Training with 3D tone mapping often results in inaccurate HDR rendering, while training with 2D tone mapping degrades LDR rendering quality, leading to a higher LDR RMSE metric compared to 3D tone mapping.