Abstract

A circular Dammann grating in the front focal plane of a lens is used to generate an annular beam in the back focal plane to code an object by two-dimensional scanning. The coded image of the object is decoded digitally by convolving it with the same annular beam used to code the object. Simple inverse filtering is subsequently used to improve the contrast of the decoded image.

© 2008 Optical Society of America

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History
Original Manuscript: July 2, 2008
Manuscript Accepted: November 18, 2008
Revised Manuscript: November 11, 2008
Published: December 22, 2008

References

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Author Affiliations

Po Sheun Chung

City University of Hong Kong

Kyu B. Doh

Korea Aerospace University

Kelly Dobson, Ting-Chung Poon

Virginia Tech

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