NDLI: The Reverse Projection Correlation Principle for Depth from Defocus

Content Provider	IEEE Xplore Digital Library
Author	McCloskey, S. Langer, M. Siddiqi, K.
Copyright Year	2006
Description	Author affiliation: Centre for Intell. Machines, McGill Univ., Montreal, QC (McCloskey, S.; Langer, M.; Siddiqi, K.)
Abstract	In this paper, we address the problem of finding depth from defocus in a fundamentally new way. Most previous methods have used an approximate model in which blurring is shift invariant and pixel area is negligible. Our model avoids these assumptions. We consider the area in the scene whose radiance is recorded by a pixel on the sensor, and relate the size and shape of that area to the scene's position with respect to the plane of focus. This is the notion of reverse projection, which allows us to illustrate that, when out of focus, neighboring pixels will record light from overlapping regions in the scene. This overlap results in a measurable change in the correlation between the pixels' intensity values. We demonstrate that this relationship can be characterized in such a way as to recover depth from defocused images. Experimental results show the ability of this relationship to accurately predict depth from correlation measurements.
Starting Page	607
Ending Page	614
File Size	749526
Page Count	8
File Format	PDF
ISBN	0769528252
DOI	10.1109/3DPVT.2006.136
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Layout Focusing Lenses Computer vision Humans Shape Cameras Image reconstruction Equations Optical sensors
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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