Wavelength Selection Using a Modified Camera to Improve Image-Based 3D Reconstruction of Heritage Objects

Tools for image-based 3D-reconstruction are commonly used cultural heritage applications; however, wider usage has increased variability in the quality of output 3D models. Geometric variations between models acquired with differing methods make metric conservation applications such as condition monitoring and measuring change over time challenging. This article presents an investigation wavelength selection using a modified off-the-shelf DSLR camera bandpass filters to improve input image study wooden sculpture coyote turtle from Smithsonian American Art Museum. The large crack concern conservators, but its curved, dark shiny surface challenges dimensional monitoring. Selecting infrared wavelengths rather than visible light reconstruction images reduced specular reflections improved contrast resulting recording shape. 3D-reconstructions radiation produce better reconstructions those light. In this case reconstructed discrepancies ∼0.6 mm whilst ∼0.3 mm. Results suggest that reflected more forgiving flexible data dark, surfaces thus reliability comparability 3D-reconstruction.