3DThermoScan: Simultaneous 3D reconstruction and temperature measurement with a single camera
Résumé
We introduce 3DThermoScan, a proof-of-concept method employing a single camera for full 3D thermal reconstruction, i.e., joint geometry and temperature recovery. Most existing approaches rely on infraredvisible camera pairs, requiring cross-system calibration and strong assumptions on surface emissivity. Our method instead inverts a unified image formation model that accounts for both reflection and emission. This approach allows us to estimate both geometry and temperature from a single set of images captured by one camera, thereby overcoming these limitations. From images captured under controlled active lighting, 3DThermoScan integrates photometric stereo and thermoreflectometry to estimate surface normals, albedo, and radiance temperature. With Lambertian reflectance as the only optical assumption, we recover surface emissivity and true temperature from these estimates, and map them onto the 3D model. We performed preliminary experiments on synthetic and real diffuse surfaces with diverse geometric and thermal properties. Noise sensitivity tests showed the robustness of our method with errors under 5 °for normals and under 1 °C for temperature. When comparing the result of our real-world experiment to the result of a commercial scanner, we found an average 3D reconstruction error of 0.1 mm, which confirmed the potential of this method.
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