Results 71 to 80 of about 111 (93)

Uncalibrated Photometric Stereo Using Quadric Surfaces with Two Cameras

2020
Inverse rendering is a method for estimating object shapes and lighting conditions from a set of images. In the present paper, we propose an uncalibrated photometric stereo method that approximates the shapes of the target objects using quadric surfaces (ellipsoids or hyperboloids), and this shape representation allows us to use multiple cameras in ...
Takumi Nasu, Tsuyoshi Migita, Takeshi Shakunaga, Norikazu Takahashi   +3 more
openaire   +1 more source

Shape-from-Shifting: Uncalibrated Photometric Stereo with a Mobile Device

2017 IEEE 13th International Conference on e-Science (e-Science), 2017
Surface shape scanning techniques, such as laser scanning and photometric stereo, are widespread analytical tools used in the field of cultural heritage. Compared to regular 2D RGB photos, 3D surface scans provide higher fidelity of an object's surface shape which assist conservators, art historians, and archaeologists in understanding how these ...
Chia-Kai Yeh, Fengqiang Li, Gianluca Pastorelli, Marc Walton, Aggelos K. Katsaggelos, Oliver Cossairt   +5 more
openaire   +1 more source

Fusing Multiview and Photometric Stereo for 3D Reconstruction under Uncalibrated Illumination

IEEE Transactions on Visualization and Computer Graphics, 2011
We propose a method to obtain a complete and accurate 3D model from multiview images captured under a variety of unknown illuminations. Based on recent results showing that for Lambertian objects, general illumination can be approximated well using low-order spherical harmonics, we develop a robust alternating approach to recover surface normals ...
Chenglei Wu, Yebin Liu, Qionghai Dai, Bennett Wilburn   +3 more
openaire   +2 more sources

In Search of an Optimal Set of Images for Uncalibrated Photometric Stereo

2008 Seventh Mexican International Conference on Artificial Intelligence, 2008
In this paper, we draw on the ideas of previous work done by Drbohlav and Chantler [5], where a theoretical study on the optimal lighting configuration for photometric stereo was developed. They demonstrated that the known n light source azimuth angles should be equally spaced over 360/n degrees and the n light source elevation angles should be ...
Felipe Hernández-Rodríguez, Mario Castelán   +1 more
openaire   +1 more source

Revisiting One-Stage Deep Uncalibrated Photometric Stereo via Fourier Embedding

IEEE Transactions on Pattern Analysis and Machine Intelligence
This paper introduces a one-stage deep uncalibrated photometric stereo (UPS) network, namely Fourier Uncalibrated Photometric Stereo Network (FUPS-Net), for non-Lambertian objects under unknown light directions. It departs from traditional two-stage methods that first explicitly learn lighting information and then estimate surface normals.
Yakun Ju, Boxin Shi, Bihan Wen
exaly   +3 more sources

A closed-form solution to uncalibrated photometric stereo via diffuse maxima

2012 IEEE Conference on Computer Vision and Pattern Recognition, 2012
In this paper we propose a novel solution to uncalibrated photometric stereo. Our approach is to eliminate the so-called generalized bas relief (GBR) ambiguity by exploiting points where the Lambertian reflection is maximal. We demonstrate several noteworthy properties of these maxima: 1) Closed-form solution: A single diffuse maximum constrains the ...
Paolo Favaro, Thoma Papadhimitri
openaire   +1 more source

Spin-UP: Spin Light for Natural Light Uncalibrated Photometric Stereo

2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)
Paper accepted by ...
Boxin Shi, Gang Pan, Xudong Jiang
exaly   +3 more sources

Shading- and geometry-aware lighting calibration network for uncalibrated photometric stereo

Neurocomputing
Yuze Yang, Jiahang Liu
exaly   +2 more sources

Uncalibrated photometric stereo constrained by intrinsic reflectance image and shape from silhoutte

2019 16th International Conference on Machine Vision Applications (MVA), 2019
Photometric stereo is a method which estimates surface normal from object's shading. Uncalibrated photometric stereo is the photometric stereo where the light source direction is unknown. Uncalibrated photometric stereo which estimates both light source direction and surface normal is an ill-posed problem, and has ambiguity for solving the problem.
Daisuke Miyazaki, Shinsaku Hiura
exaly   +2 more sources

Incorporating the Torrance and Sparrow model of reflectance in uncalibrated photometric stereo

Proceedings Ninth IEEE International Conference on Computer Vision, 2003
Under the Lambertian reflectance model, uncalibrated photometric stereo with unknown light sources is inherently ambiguous. In this paper, we consider the use of a more general reflectance model, namely the Torrance and Sparrow model, in uncalibrated photometric stereo.
openaire   +1 more source