Results 61 to 70 of about 153,707 (188)
ACCURACY OF 3D RECONSTRUCTION IN AN ILLUMINATION DOME [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016 The accuracy of 3D surface reconstruction was compared from image sets of a Metric Test Object taken in an illumination dome by two methods: photometric stereo and improved structure-from-motion (SfM), using point cloud data from a 3D colour laser ...
L. MacDonald +5 more
doaj +1 more source
Automated Optical Inspection System for O-Ring Based on Photometric Stereo and Machine Vision
Applied Sciences, 2021 This research developed an AOI (automated optical inspection) system for the O-Ring inspection. First, an AOI system was implemented to detect surface scratches, flow marks, non-fills, and indentations on elastomer O-Rings with high surface reflection ...
Fu-Sheng Yang +2 more
doaj +1 more source
A Survey of Photometric Stereo Techniques [PDF]
Foundations and Trends® in Computer Graphics and Vision, 2015 Reconstructing the shape of an object from images is an important problem in computer vision that has led to a variety of solution strategies. This survey covers photometric stereo, i.e., techniques that exploit the observed intensity variations caused by illumination changes to recover the orientation of the surface.
Jens Ackermann, Michael Goesele
openaire +2 more sources
Geometric Prior-Guided Self-Supervised Learning for Multi-View Stereo
Remote Sensing, 2023 Recently, self-supervised multi-view stereo (MVS) methods, which are dependent primarily on optimizing networks using photometric consistency, have made clear progress. However, the difference in lighting between different views and reflective objects in
Liman Liu +4 more
doaj +1 more source
A Comprehensive Real-World Photometric Stereo Dataset for Unsupervised Anomaly Detection
IEEE Access, 2022 Unsupervised anomaly detection is a technology that trains a model to detect anomalies using only normal data. One of the main challenges of anomaly detection is detecting defects that are not visible or obscured by lighting conditions.
Junyong Jung +3 more
doaj +1 more source
Photometric Stereo in a Scattering Medium [PDF]
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2015 Photometric stereo is widely used for 3D reconstruction. However, its use in scattering media such as water, biological tissue and fog has been limited until now, because of forward scattered light from both the source and object, as well as light scattered back from the medium (backscatter). Here we make three contributions to address the key modes of
Zak Murez +3 more
openaire +2 more sources
TacScope: A Miniaturized Vision‐Based Tactile Sensor for Surgical Applications
Advanced Robotics Research, EarlyView.TacScope is a compact, vision‐based tactile sensor designed for robot‐assisted surgery. By leveraging a curved elastomer surface with pressure‐sensitive particle redistribution, it captures high‐resolution 3D tactile feedback. TacScope enables accurate tumor detection and shape classification beneath soft tissue phantoms, offering a scalable, low‐cost ...
Md Rakibul Islam Prince +3 more
wiley +1 more source
Examining the uncertainty of the recovered surface normal in three light photometric stereo
, 2007 Although the three light photometric stereo technique has been used in many applications, there is little published work concerned with characterizing the uncertainty of these systems due to the involvement of a number of complicating factors. This paper
Smith, Lyndon +3 more
core +1 more source
Photometric Stereo Super Resolution via Complex Surface Structure Estimation
IEEE AccessPhotometric stereo, which derives per-pixel surface normals from shading cues, faces challenges in capturing high-resolution (HR) images in linear response systems.
Han-Nyoung Lee, Hak Gu Kim
doaj +1 more source
Flexible Sensors for Robotics Tactile Perception: A Review
Advanced Robotics Research, EarlyView.Flexible tactile sensing for robotics is reviewed through four interconnected dimensions. Physical mechanisms include piezoresistive, capacitive, piezoelectric, triboelectric, iontronic, and optical sensing. Structural design includes bioinspired, defect‐based, and MEMS‐based tactile systems.
Yu Song, Ying Chen, Yihao Chen, Xue Feng
wiley +1 more source