loading
Documents

Research.Publish.Connect.

Paper

Paper Unlock

Authors: Faisal Azhar 1 ; Khemraj Emrith 2 ; Stephen Pollard 1 ; Melvyn Smith 2 ; Guy Adams 1 and Steve Simske 1

Affiliations: 1 Hewlett Packard Laboratories, United Kingdom ; 2 University of West of England, United Kingdom

ISBN: 978-989-758-089-5

Keyword(s): Micro-scale Photometric Stereo, Lambert Reflectance Model, Paper and Surface Normals.

Related Ontology Subjects/Areas/Topics: Applications ; Applications and Services ; Computer Vision, Visualization and Computer Graphics ; Document Imaging in Business ; Features Extraction ; Geometry and Modeling ; Image and Video Analysis ; Image Formation and Preprocessing ; Image Formation, Acquisition Devices and Sensors ; Image Registration ; Image-Based Modeling ; Pattern Recognition ; Software Engineering

Abstract: This paper presents an empirical study to investigate the use of photometric stereo (PS) for micro-scale 3D measurement of paper samples. PS estimates per-pixel surface orientation from images of a surface captured from the same viewpoint but under different illumination directions. Specifically, we investigate the surface properties of paper to test whether they are sufficiently well approximated by a Lambertian reflectance model to allow veridical surface reconstruction under PS and explore the range of conditions for which this model is valid. We present an empirical setup that is used to conduct a series of experiments in order to analyse the applicability of PS at the micro-scale. In addition, we determine the best 4, 6, and 8 light source tilt (illumination) angles with respect to multi-source micro-scale PS. Furthermore, an intensity based image registration method is used to test the accuracy of the recovery of surface normals. The results demonstrate that at the micro-scale: (a) Lambert model represents well the data sets with low root mean square (RMS) error between the original and reconstructed image, (b) increasing the light sources from 4 to 8 reduces RMS error, and (c) PS can be used to extract veridical surface normals. (More)

PDF ImageFull Text

Download
CC BY-NC-ND 4.0

Sign In Guest: Register as new SciTePress user now for free.

Sign In SciTePress user: please login.

PDF ImageMy Papers

You are not signed in, therefore limits apply to your IP address 3.226.251.81

In the current month:
Recent papers: 100 available of 100 total
2+ years older papers: 200 available of 200 total

Paper citation in several formats:
Azhar, F.; Emrith, K.; Pollard, S.; Smith , M.; Adams, G. and Simske, S. (2015). Testing the Validity of Lamberts Law for Micro-scale Photometric Stereo Applied to Paper Substrates.In Proceedings of the 10th International Conference on Computer Vision Theory and Applications - Volume 1: VISAPP, (VISIGRAPP 2015) ISBN 978-989-758-089-5, pages 246-253. DOI: 10.5220/0005359302460253

@conference{visapp15,
author={Faisal Azhar. and Khemraj Emrith. and Stephen Pollard. and Melvyn Smith . and Guy Adams. and Steve Simske.},
title={Testing the Validity of Lamberts Law for Micro-scale Photometric Stereo Applied to Paper Substrates},
booktitle={Proceedings of the 10th International Conference on Computer Vision Theory and Applications - Volume 1: VISAPP, (VISIGRAPP 2015)},
year={2015},
pages={246-253},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005359302460253},
isbn={978-989-758-089-5},
}

TY - CONF

JO - Proceedings of the 10th International Conference on Computer Vision Theory and Applications - Volume 1: VISAPP, (VISIGRAPP 2015)
TI - Testing the Validity of Lamberts Law for Micro-scale Photometric Stereo Applied to Paper Substrates
SN - 978-989-758-089-5
AU - Azhar, F.
AU - Emrith, K.
AU - Pollard, S.
AU - Smith , M.
AU - Adams, G.
AU - Simske, S.
PY - 2015
SP - 246
EP - 253
DO - 10.5220/0005359302460253

Login or register to post comments.

Comments on this Paper: Be the first to review this paper.