Results 11 to 20 of about 12,539 (191)
A Photometric Stereo Using Re-Projected Images for Active Stereo Vision System
Applied Sciences (Switzerland), 2017 In optical 3D shape measurement, stereo vision with structured light can measure 3D scan data with high accuracy and is used in many applications, but fine surface detail is difficult to obtain.
Keonhwa Jung +4 more
exaly +3 more sources
Photometric-Stereo-Based Defect Detection System for Metal Parts
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 ...
Yanlong Cao +6 more
doaj +1 more source
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 +4 more sources
PHOTOMETRIC STEREO SHAPE-AND-ALBEDO-FROM-SHADING FOR PIXEL-LEVEL RESOLUTION LUNAR SURFACE RECONSTRUCTION [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017 Shape and Albedo from Shading (SAfS) techniques recover pixel-wise surface details based on the relationship between terrain slopes, illumination and imaging geometry, and the energy response (i.e., image intensity) captured by the sensing system ...
W. C. Liu, B. Wu
doaj +1 more source
Deep Photometric Stereo Network with Multi-Scale Feature Aggregation
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 +1 more source
Binocular Photometric Stereo [PDF]
Procedings of the British Machine Vision Conference 2011, 2011 This paper considers the problem of computing scene depth from a stereo pair of cameras under a sequence of illumination directions. By integrating parallax and shading cues, we obtain both metric depth and fine surface details. Casting this problem into the filter flow framework [16], enables a convex formulation of the problem, and thus a globally ...
Hao Du 0004 +2 more
openaire +1 more source
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 +1 more source
Photometric Stereo in the Wild [PDF]
2015 IEEE Winter Conference on Applications of Computer Vision, 2015 Conventional photometric stereo requires to capture images or videos in a dark room to obstruct complex environment light as much as possible. This paper presents a new method that capitalizes on environment light to avail geometry reconstruction, thus bringing photometric stereo to the wild, such as an outdoor scene, with uncontrolled lighting.
Chun Ho Hung +5 more
openaire +1 more source
Learning conditional photometric stereo with high-resolution features
Computational Visual Media, 2021 Photometric stereo aims to reconstruct 3D geometry by recovering the dense surface orientation of a 3D object from multiple images under differing illumination.
Yakun Ju +4 more
doaj +1 more source
Machines, 2022 High-quality reconstruction of polished surfaces is a promising yet challenging task in the industrial field. Due to its extreme reflective properties, state-of-the-art methods have not achieved a satisfying trade-off between retaining texture and ...
Yanlong Cao +5 more
doaj +1 more source