Results 41 to 50 of about 12,539 (191)

Overcoming the Challenges Associated with Image-based Mapping of Small Bodies in Preparation for the OSIRIS-REx Mission to (101955) Bennu [PDF]

, 2018
The OSIRIS-REx Asteroid Sample Return Mission is the third mission in NASA's New Frontiers Program and is the first U.S. mission to return samples from an asteroid to Earth.
Backer, J., Becker, K., Becker, T., Bennett, C. A., Berry, K., Boynton, W. V., Burke, K. N., Campins, H. C., Carcich, B., Chojnacki, M., Clark, B. E., Cook, D. A., Corre, L. Le, Crombie, M. K., d'Aubigny, C. Drouet, de Leon, J., DellaGiustina, D. N., Edmundson, K. L., Enos, H. L., Getzandanner, K., Golish, D. R, Habib, N., Hergenrother, C. W., Kidd Jr., J. N., Kinney-Spano, E. K., Lauretta, D. S., Leonard, J. M., Licandro, J., Mapel, J., Milazzo, M. P., Nolan, M. C., Polit, A. T., Rizk, B., Rizos, J. L., Roper, H., Sides, S., Smith, P. H., Sutton, S. S., Walsh, K. J., Westermann, M. M., Wibben, D. R.   +40 more
core   +2 more sources

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, I. Toschi, E. Nocerino, M. Hess, F. Remondino, S. Robson   +5 more
doaj   +1 more source

Joint optimisation model for light source position based on a combined target [PDF]

MATEC Web of Conferences
Photometric stereo vision, as a non-contact three-dimensional imaging technology, can achieve fast and high-precision reconstruction of normal vectors and three-dimensional morphology of object surfaces by resolving the intensity changes under different ...
Kong Xiangjin, Wang Zijing, Miao Yupei, Liu Xiaoli, Yang Qingping, Tang Qijian   +5 more
doaj   +1 more source

Robust Photometric Stereo Using Learned Image and Gradient Dictionaries

, 2017
Photometric stereo is a method for estimating the normal vectors of an object from images of the object under varying lighting conditions. Motivated by several recent works that extend photometric stereo to more general objects and lighting conditions ...
Moore, Brian E., Nadakuditi, Raj Rao, Wagenmaker, Andrew J.   +2 more
core   +1 more source

Photometric Stereo-Based Depth Map Reconstruction for Monocular Capsule Endoscopy

Sensors, 2020
The capsule endoscopy robot can only use monocular vision due to the dimensional limit. To improve the depth perception of the monocular capsule endoscopy robot, this paper proposes a photometric stereo-based depth map reconstruction method. First, based
Yang Hao, Jing Li, Fei Meng, Peisen Zhang, Gastone Ciuti, Paolo Dario, Qiang Huang   +6 more
doaj   +1 more source

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, Fenghao Zhang, Wanjuan Su, Yuhang Qi, Wenbing Tao   +4 more
doaj   +1 more source

Medieval Coins of Three Different Types and of Various States of Preservation

Journal of Open Archaeology Data
We have developed a device for digitizing coins using photometric stereo, which serves two purposes. For inventory it allows identifying a coin, which has been digitized before, and avoids mixing up similar coins.
Thomas Dunker, Anika Tauschensky, Hubert Mara, Erik Trostmann   +3 more
doaj   +1 more source

Photometric Calibration for Stereo Camera with Gamma-like Response Function in Direct Visual Odometry

Sensors, 2021
Direct visual odometry algorithms assume that every frame from the camera has the same photometric characteristics. However, the cameras with auto exposure are widely used outdoors as the environment often changes. The vignetting also affects the pixel’s
Yinming Miao, Masahiro Yamaguchi
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, Seungoh Han, Jinsun Park, Donghyeon Cho   +3 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   +1 more source