Results 11 to 20 of about 12,022 (190)
Photometric stereo data for the validation of a structural health monitoring test rig [PDF]
Data in BriefPhotometric stereo uses images of objects illuminated from various directions to calculate surface normals which can be used to generate 3D meshes of the object.
Jennifer Blair +9 more
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DRM-Based Colour Photometric Stereo Using Diffuse-Specular Separation for Non-Lambertian Surfaces [PDF]
Journal of Imaging, 2022 This paper presents a photometric stereo (PS) method based on the dichromatic reflectance model (DRM) using colour images. The proposed method estimates surface orientations for surfaces with non-Lambertian reflectance using diffuse-specular separation ...
Boren Li, Tomonari Furukawa
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Photometric stereo for strong specular highlights
Computational Visual Media, 2018 Photometric stereo is a fundamental technique in computer vision known to produce 3D shape with high accuracy. It uses several input images of a static scene taken from one and the same camera position but under varying illumination. The vast majority of
Maryam Khanian +2 more
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Three-Dimensional Reconstruction from Single Image Base on Combination of CNN and Multi-Spectral Photometric Stereo [PDF]
Sensors, 2018 Multi-spectral photometric stereo can recover pixel-wise surface normal from a single RGB image. The difficulty lies in that the intensity in each channel is the tangle of illumination, albedo and camera response; thus, an initial estimate of the normal ...
Liang Lu +4 more
doaj +2 more sources
Sweet—An Open Source Modular Platform for Contactless Hand Vascular Biometric Experiments [PDF]
SensorsCurrent finger-vein or palm-vein recognition systems usually require direct contact of the subject with the apparatus. This can be problematic in environments where hygiene is of primary importance.
David Geissbühler +4 more
doaj +2 more sources
INVESTIGATING 3D RECONSTRUCTION OF NON-COLLABORATIVE SURFACES THROUGH PHOTOGRAMMETRY AND PHOTOMETRIC STEREO [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021 3D digital reconstruction techniques are extensively used for quality control purposes. Among them, photogrammetry and photometric stereo methods have been for a long time used with success in several application fields.
A. Karami +3 more
doaj +1 more source
Remote Sensing, 2021 Topographic products are important for mission operations and scientific research in lunar exploration. In a lunar rover mission, high-resolution digital elevation models are typically generated at waypoints by photogrammetry methods based on rover ...
Man Peng +6 more
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Multiview Photometric Stereo [PDF]
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2008 This paper addresses the problem of obtaining complete, detailed reconstructions of textureless shiny objects. We present an algorithm which uses silhouettes of the object, as well as images obtained under changing illumination conditions. In contrast with previous photometric stereo techniques, ours is not limited to a single viewpoint but produces ...
Hernández, Carlos +2 more
openaire +2 more sources
Light invariant photometric stereo
Optics Express, 2023 An imaging setup that enables unsynchronized photometric stereo (PS) for Lambertian objects based on modulated light sources is presented. Knowing the specific frequency of the modulated light source allows to filter out any other light in the scene. This creates an image that depends only on the particular light source while ignoring the ambient light.
Yuval Braun, Hugo Guterman
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Single Day Outdoor Photometric Stereo [PDF]
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2021 Photometric Stereo (PS) under outdoor illumination remains a challenging, ill-posed problem due to insufficient variability in illumination. Months-long capture sessions are typically used in this setup, with little success on shorter, single-day time intervals. In this paper, we investigate the solution of outdoor PS over a single day, under different
Yannick Hold-Geoffroy +2 more
openaire +3 more sources