Journal ArticleDOI
Multispectral photometric stereo for acquiring high-fidelity surface normals.
Giljoo Nam,Min H. Kim +1 more
TLDR
A new mult ispectral photometric-stereo method removes interreflection on diffuse materials using multispectral-reflectance information and reconstructs 3D shapes with high accuracy.Abstract:
Multispectral imaging and photometric stereo are common in 3D imaging but rarely have been combined. Reconstructing a 3D object's shape using photometric stereo is challenging owing to indirect illumination, specular reflection, and self-shadows, and removing interreflection in photometric stereo is problematic. A new multispectral photometric-stereo method removes interreflection on diffuse materials using multispectral-reflectance information and reconstructs 3D shapes with high accuracy. You can integrate this method into photometric-stereo systems by simply substituting the original camera with a multispectral camera.read more
Citations
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Journal ArticleDOI
Practical SVBRDF acquisition of 3D objects with unstructured flash photography
TL;DR: By removing the diffuse reflection assumption and leveraging instead such SVBRDF information, the method outputs high-quality 3D geometry reconstructions, including more accurate high-frequency details than state-of-the-art multiview stereo techniques.
Journal ArticleDOI
Compact snapshot hyperspectral imaging with diffracted rotation
TL;DR: This work presents a compact, diffraction-based snapshot hyperspectral imaging method, using only a novel diffractive optical element (DOE) in front of a conventional, bare image sensor, and introduces a novel DOE design that generates an anisotropic shape of the spectrally-varying PSF.
Journal ArticleDOI
Simultaneous acquisition of polarimetric SVBRDF and normals
TL;DR: This work presents a complete polarimetric BRDF (pBRDF) model that can define mixed polarization of both specular and diffuse reflection, and proposes a novel inverse-rendering method with joint optimization of pBRDF and normals to capture spatially-varying material appearance.
Proceedings ArticleDOI
Unbiased Photometric Stereo for Colored Surfaces: A Variational Approach
TL;DR: A new formulation of color photometric stereo is proposed, based on image ratios, that makes the technique independent from the albedos, which allows the unbiased 3D-reconstruction of colored surfaces in a single step, by solving a system of linear PDEs using a variational approach.
Journal ArticleDOI
Simultaneous acquisition of microscale reflectance and normals
TL;DR: This paper designs and builds a microscopic light dome with 374 LED lights over the hemisphere, specifically tailored to the characteristics of microscopic imaging, to achieve the highest resolution for both spatially-varying material appearance and normals simultaneously at the microscale resolution.
References
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Journal ArticleDOI
Fast separation of direct and global components of a scene using high frequency illumination
TL;DR: Fast methods for separating the direct and global illumination components of a scene measured by a camera and illuminated by a light source for scenes that include complex interreflections, subsurface scattering and volumetric scattering are presented.
Journal ArticleDOI
Photometric Stereo with General, Unknown Lighting
TL;DR: This paper shows how to perform photometric stereo assuming that all lights in a scene are distant from the object but otherwise unconstrained, and reconstructing the shape of objects from images obtained under a variety of lightings.
Journal ArticleDOI
Design of pushbroom imaging spectrometers for optimum recovery of spectroscopic and spatial information
TL;DR: A modulation transfer function-based optimization method is described that generates optimal spectral and spatial uniformity of response from compact pushbroom imaging spectrometer designs.
Journal ArticleDOI
Shape from interreflections
TL;DR: It is shown that, for Lambertian surfaces, the pseudo shape and reflectance are unique and can be mathematically related to the actual shape andreflectance of the surface.
Journal ArticleDOI
3D imaging spectroscopy for measuring hyperspectral patterns on solid objects
Min H. Kim,Todd Alan Harvey,David S. Kittle,Holly Rushmeier,Julie Dorsey,Richard O. Prum,David J. Brady +6 more
TL;DR: This work introduces an end-to-end measurement system for capturing spectral data on 3D objects and demonstrates the use of this measurement system in the study of the interplay between the visual capabilities and appearance of birds.