On Uniqueness of Solutions of the Three-Light-Source Photometric Stereo: Conditions on Illumination Configuration and Surface Reflectance

2001 ◽  
Vol 81 (2) ◽  
pp. 211-226 ◽  
Author(s):  
Takayuki Okatani ◽  
Koichiro Deguchi
Keyword(s):  
Light Source ◽  
Photometric Stereo ◽  
Surface Reflectance ◽  
Uniqueness Of Solutions

Dense 3D Reconstruction Based on Photometric Stereo with Unknown Light Source via Energy Minimization Framework

2013 ◽  
Vol 427-429 ◽  
pp. 1776-1780
Author(s):  
Yong Yan Yu
Keyword(s):  
3D Reconstruction ◽  
Prior Knowledge ◽  
Light Source ◽  
Energy Minimization ◽  
Photometric Stereo ◽  
Initial Surface ◽  
Regularization Technique ◽  
Normal Estimate ◽  
Novel Method ◽  
Dense 3D Reconstruction

In this paper,an novel method would be suggested to achieve an dense 3D reconstruction of objects using photometric stereo without any prior knowledge of light source. Using the photometric images I which is constructed with its columns equal to number of photometric images captured and rows equal to number of pixels in a photometric image. A per pixel initial surface normal estimate is computed based upon SVD of the image matrix I. A effective regularization technique has been applied on the initial normal estimate within the energy minimization framework which via graph cuts to regularize them and preserve the underlying discontinuities better.Finally, the regularized surface normals are integrated to recover the surface of the object. The algorithm has been tested on synthetic as well as real datasets and very encouraging results have been obtained.

scholarly journals Calibration of position and orientation for point light source synchronously with single image in photometric stereo

2019 ◽  
Vol 27 (4) ◽  
pp. 4024 ◽  
Author(s):  
Long Ma ◽  
Jirui Liu ◽  
Xin Pei ◽  
Yanmin Hu ◽  
Fengming Sun
Keyword(s):  
Light Source ◽  
Photometric Stereo ◽  
Single Image ◽  
Point Light Source ◽  
Position And Orientation ◽  
Point Light

scholarly journals Photometric Stereo Calibration using Constraint on Light Source Directions

2013 ◽  
Vol 8 (2) ◽  
pp. 111-119
Author(s):  
Seong-Cheol Jeong ◽  
Viet Hung Nguyen ◽  
Sang-Chul Won
Keyword(s):  
Light Source ◽  
Photometric Stereo ◽  
Stereo Calibration

scholarly journals Photometric Stereo Calibration Using Constraint on Light Source Directions

2012 ◽  
Vol 45 (23) ◽  
pp. 90-95
Author(s):  
Viet Hung Nguyen ◽  
Dongyeop Kang ◽  
Yujin Jang ◽  
Sangchul Won
Keyword(s):  
Light Source ◽  
Photometric Stereo ◽  
Stereo Calibration

Light source position calibration method for photometric stereo in capsule endoscopy

2020 ◽  
Vol 34 (12) ◽  
pp. 789-801
Author(s):  
Yang Hao ◽  
Marco Visentini-Scarzanella ◽  
Jing Li ◽  
Peisen Zhang ◽  
Gastone Ciuti ◽  
...  
Keyword(s):  
Light Source ◽  
Capsule Endoscopy ◽  
Calibration Method ◽  
Photometric Stereo ◽  
Source Position ◽  
Position Calibration

Spectral characteristics of road surfaces and eye transmittance: Effects on energy efficiency of road lighting at mesopic levels

2017 ◽  
Vol 50 (6) ◽  
pp. 842-861 ◽  
Author(s):  
OU Preciado ◽  
ER Manzano
Keyword(s):  
Energy Efficiency ◽  
Light Source ◽  
Spectral Characteristics ◽  
The Other ◽  
Visual Performance ◽  
Light Sources ◽  
Surface Reflectance ◽  
Road Lighting ◽  
Road Surfaces ◽  
Final Effect

In 2010, the CIE published a recommended system for mesopic photometry based on visual performance. According to this system, scenes illuminated at mesopic levels with light sources of high S/P ratio, will produce better visual performance than those illuminated with light sources of a lower S/P ratio at equal photopic luminance. However, there could be other factors affected by SPD that, when quantified, could lead to a contradictory final effect. The scope of this paper was to evaluate how road lighting is affected by the spectral road surface reflectance and by the human eye transmittance as people get older. Our results suggest that the benefits of considering the mesopic vision effect for light sources with high S/P ratios are totally counteracted by the other two effects at mesopic luminances between 0.75 cd/m2 and 1.73 cd/m2 for people between 20 and 60 years of age, depending on the light source and the age of observers.

Recovery of shape and surface reflectance of specular object from relative rotation of light source

2003 ◽  
Vol 21 (9) ◽  
pp. 777-787 ◽  
Author(s):  
Hideo Saito ◽  
Kazuko Omata ◽  
Shinji Ozawa
Keyword(s):  
Light Source ◽  
Surface Reflectance ◽  
Relative Rotation
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