Results 11 to 20 of about 153,707 (188)
Example-Based Multispectral Photometric Stereo for Multi-Colored Surfaces [PDF]
Journal of Imaging, 2022 A photometric stereo needs three images taken under three different light directions lit one by one, while a color photometric stereo needs only one image taken under three different lights lit at the same time with different light directions and ...
Daisuke Miyazaki
exaly +5 more sources
Photometric-Stereo-Based Defect Detection System for Metal Parts [PDF]
Sensors, 2022 Automated inspection technology based on computer vision is now widely used in the manufacturing industry with high speed and accuracy. However, metal parts always appear in high gloss or shadow on the surface, resulting in the overexposure of the ...
Jiangxin Yang, Yanlong Cao
exaly +5 more sources
Combining Photogrammetry and Photometric Stereo to Achieve Precise and Complete 3D Reconstruction [PDF]
Sensors, 2022 Image-based 3D reconstruction has been employed in industrial metrology for micro-measurements and quality control purposes. However, generating a highly-detailed and reliable 3D reconstruction of non-collaborative surfaces is still an open issue.
Fabio Remondino +2 more
exaly +4 more sources
Polarisation photometric stereo [PDF]
Computer Vision and Image Understanding, 2017 This paper concerns a novel approach to fuse two-source photometric stereo (PS) data with polarisation information for complete surface normal recovery for smooth or slightly rough surfaces. PS is a well-established method but is limited in application by its need for three or more well-spaced and known illumination sources and Lambertian reflectance ...
Gary Atkinson
exaly +4 more sources
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 ...
George Vogiatzis, Roberto Cipolla
exaly +6 more sources
Color Photometric Stereo Using Multi-Band Camera Constrained by Median Filter and Occluding Boundary [PDF]
Journal of Imaging, 2019 One of the main problems faced by the photometric stereo method is that several measurements are required, as this method needs illumination from light sources from different directions.
Daisuke Miyazaki
exaly +4 more sources
Deep Photometric Stereo Network with Multi-Scale Feature Aggregation [PDF]
Sensors, 2020 We present photometric stereo algorithms robust to non-Lambertian reflection, which are based on a convolutional neural network in which surface normals of objects with complex geometry and surface reflectance are estimated from a given set of an ...
Chanki Yu, Sang Wook Lee
doaj +3 more sources
Photometric Stereo-Based Defect Detection System for Steel Components Manufacturing Using a Deep Segmentation Network [PDF]
Sensors, 2022 This paper presents an automatic system for the quality control of metallic components using a photometric stereo-based sensor and a customized semantic segmentation network.
Fátima A. Saiz +3 more
doaj +2 more sources
Optical Imaging Technology In Colonoscopy - Is There A Role For Photometric Stereo [PDF]
World J Gastrointest Endosc, 2020 Colonoscopy screening for the detection and removal of colonic adenomas is central to efforts to reduce the morbidity and mortality of colorectal cancer.
Shandro, Benjamin M +4 more
core +2 more sources
Photometric stereo endoscopy [PDF]
Journal of Biomedical Optics, 2013 While color video endoscopy has enabled wide-field examination of the gastrointestinal tract, it often misses or incorrectly classifies lesions. Many of these missed lesions exhibit characteristic three-dimensional surface topographies. An endoscopic system that adds topographical measurements to conventional color imagery could therefore increase ...
Parot Fernández, Vicente José +6 more
openaire +7 more sources