Polarimetric 3D reconstruction of colored targets based on narrowband multispectral dispersion constraints and chromaticity-based desaturation
Year: 2026
Type: article
Abstract: The spatially nonuniform distribution of surface reflectance on colored targets causes traditional polarimetric 3D reconstruction methods which presuppose uniform refractive index and reflectance to produce systematic deviations in zenith-angle estimation and to render azimuth disambiguation ineffective, ultimately leading to shape distortion and loss of detail in the reconstructed results. To address this problem, this paper proposes a polarimetric 3D reconstruction method for colored Lambertian or approximately Lambertian dielectric targets based on narrowband multispectral dispersion constraints and chromaticity-based desaturation. First, a narrowband multispectral imaging system is employed to acquire polarization images of the target in multiple spectral channels; intrinsic image decomposition constrained by chromaticity gradients is used to strip away the spatial nonuniformity of reflectance and recover the intrinsic shading component modulated solely by surface geometry, thereby eliminating the interference of color information with shading-normal estimation. Second, the Cauchy dispersion equation is introduced to characterize the variation of the refractive index with wavelength, and a joint inversion model of the zenith angle and dispersion coefficients is constructed, transforming the underdetermined problem in a single spectral channel into a jointly constrained estimation problem across multiple spectral channels, thereby achieving accurate zenith-angle estimation without prior knowledge of the refractive index. Finally, using the desaturated clean shading normal as a directional constraint, azimuth ambiguity is eliminated through vector-angle consistency screening, and the normal field is further optimized with a smoothness regularization prior before the 3D surface topography is reconstructed by Poisson integration. Experimental results demonstrate that the proposed method achieves high-precision 3D reconstruction of colored Lambertian or approximately Lambertian dielectric objects with nonuniform reflectance under natural light and a single viewpoint, effectively alleviating the dependence of traditional polarimetric 3D imaging on material uniformity, with reconstruction accuracy significantly improved over single-spectral-channel methods.
Source: Optics Express
DOI: 10.1364/oe.618751
Authors: Zhe Wang, Haoyang Wu, Yong Tan, Ye Zhang
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7224664746