NDLI: Recovery of 3D depth map from image shading for underwater applications

Content Provider	IEEE Xplore Digital Library
Author	Shaomin Zhang Negahdaripour, S.
Copyright Year	1997
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Miami Univ., Coral Gables, FL, USA (Shaomin Zhang)
Abstract	We study the problem of exploiting image shading for the recovery of an object's 3D shape underwater. This requires the employment of image models that take into account shading effects due to the medium optical properties, as well as the surface shape and reflectance properties. A simplified image model that incorporates the attenuation of the incident light due to beam spreading, as well as medium absorption and forward-scattering of the incident and reflected light, have been employed to recover the orientation of a planar surface from image shading [Yu and Negahdaripour 1991]. We investigate the application of this model for the recovery of the 3D shape of curved surfaces. To do this, we have implemented two methods based on the generalization of the shape from shading method of Tsai and Shah [1994]. One iterative method involves recursive adjustment of the underwater image, based on the estimate of the target's 3D shape, to correct for the shading effects due to illumination attenuation. Convergence is reached when the recovered shape, after image shading correction for the medium effects, is consistent with the object's reflectance map. A second method estimates the object's 3D shape directly from the underwater image shading model. Convergence properties and the accuracy of the solutions from the two methods are demonstrated using synthetic data. Results from experiments with the images of an underwater scene are presented to show performance with real data.
Starting Page	618
Ending Page	625
File Size	856961
Page Count	8
File Format	PDF
ISBN	0780341082
DOI	10.1109/OCEANS.1997.634437
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-06
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape Optical attenuators Reflectivity Employment Absorption Iterative methods Recursive estimation Lighting Attenuation Layout
Content Type	Text
Resource Type	Article

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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
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