NDLI: Stereo Retinex

Content Provider	IEEE Xplore Digital Library
Author	Weihua Xiong Funt, B.
Copyright Year	2006
Description	Author affiliation: Simon Fraser University, Vancouver, B.C. (Weihua Xiong)
Abstract	The Retinex algorithm for lightness and color constancy is extended here to include 3-dimensional spatial information reconstructed from a stereo image. Tests show this modification improves retinex. A key aspect of traditional Retinex is that, within each color channel, it makes local spatial comparisons of intensity. In particular, intensities ratios are computed between neighboring spatial locations. Retinex assumes that a large ratio indicates a change in surface reflectance, not a change in incident illumination; however, this assumption is often violated in 3-dimensional scenes, where an abrupt change in surface orientation can lead to a significant change in illumination. Stereo Retinex uses a stereoderived depth map to locate abrupt changes in surface orientation so that it can avoid making spatial comparisons at locations where an illumination change would otherwise be mistaken for a reflectance change. The stereo retinex algorithm builds upon the multi-resolution implementation of retinex known as McCann99. It is modified to use the 3-dimensional edge information derived from stereo images. The edge map is propagated through all levels of the multi-resolution pyramid so that at each level spatial comparisons are only made between locations lying on approximately the same plane. Experiments on real images show that Stereo Retinex performs significantly better than unmodified McCann99 retinex when evaluated in terms of accuracy with which correct surface object colors are estimated.
Starting Page	15
Ending Page	15
File Size	419486
Page Count	1
File Format	PDF
ISBN	0769525423
DOI	10.1109/CRV.2006.70
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-07
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity Computer vision Surface reconstruction Stereo image processing Layout Lighting Humans Stereo vision Image reconstruction Testing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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