Results 51 to 60 of about 153,707 (188)

Uncalibrated Near-Light Photometric Stereo [PDF]

, 2014
In this work we solve the uncalibrated photometric stereo problem with lights placed near the scene. We investigate different image formation models and find the one that best fits our observations. Although the devised model is more complex than its far-
Thoma Papadhimitri, Favaro, Paolo, Papadhimitri, Thoma, Paolo Favaro   +3 more
core   +3 more sources

Sensor node localisation using a stereo camera rig [PDF]

, 2007
In this paper, we use stereo vision processing techniques to detect and localise sensors used for monitoring simulated environmental events within an experimental sensor network testbed.
Dermot Diamond, Beirne, Stephen, Kelly, Philip, Philip Kelly, Diamond, Dermot, Alan F. Smeaton, Noel E. O'Connor, Corcoran, Brian, Roderick Shepherd, O'Connor, Noel E., Lau, King-Tong, Stephen Beirne, King Tong Lau, Smeaton, Alan F., O\u27Connor, Noel E., Brian Corcoran   +15 more
core   +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
openaire   +2 more sources

ReDDLE-Net: Reflectance Decomposition for Directional Light Estimation

Photonics, 2022
The surfaces of real objects can visually appear to be glossy, matte, or anywhere in between, but essentially, they display varying degrees of diffuse and specular reflectance.
Jiangxin Yang, Binjie Ding, Zewei He, Gang Pan, Yanpeng Cao, Yanlong Cao, Qian Zheng   +6 more
doaj   +1 more source

Deep Learning Methods for Calibrated Photometric Stereo and Beyond [PDF]

Photometric stereo recovers the surface normals of an object from multiple images with varying shading cues, i.e., modeling the relationship between surface orientation and intensity at each pixel.
Shi, Boxin, Lam, Kin-Man, Dong, Junyu, Xie, Wuyuan, Zhou, Huiyu, Ju, Yakun   +5 more
core   +8 more sources

PHOTOMETRIC STEREO ASSISTED DRAWING OF ARCHITECTURAL RELIEFS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2019
Geometric documentation is one of the most important parts of a documentary report. Despite the advances made in the field of line drawing of ancient relief surfaces, in most cases, human operator interaction is unavoidable.
A. Abzal, M. Saadatseresht, M. Varshosaz
doaj   +1 more source

An improved photometric stereo through distance estimation and light vector optimization from diffused maxima region [PDF]

, 2014
© 2013 Elsevier B.V. All rights reserved. Although photometric stereo offers an attractive technique for acquiring 3D data using low-cost equipment, inherent limitations in the methodology have served to limit its practical application, particularly in ...
Smith, Lyndon, Ahmad, Jahanzeb, Sun, Jiuai, Smith, Melvyn   +3 more
core   +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

An Adaptive Snake Based Shadow Segmentation for Robust Driver Fatigue Detection: A 3D Facial Feature Based Photometric Stereo Perspective

IEEE Access, 2023
Fatigue detection has many applications, one of them is intelligent transportation for accident prevention. It is challenging to detect driver fatigue adopting photometric stereo and 3D fatigue-related facial action unit identification.
Gulbadan Sikander, Shahzad Anwar, Ghassan Husnain, Rajermani Thinakaran, Sangsoon Lim   +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