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Proceedings Paper

Extending the depth-of-field of incoherent imaging system through wave-front coding by using composite phase masks
Author(s): Hui Zhao; Hongwei Yi; Yingcai Li
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Paper Abstract

Since 1995 when wave-front coding was first proposed by Dowski and Cathey, this technique has become a powerful tool to extend the DOF (depth of field) of incoherent imaging systems. By introducing a phase mask to the aperture plane, the optical transfer function (OTF) can be made insensitive to defocus and thus the key to this technique lies in the design of suitable phase masks. So far, many phase masks have been proposed to achieve the goal of DOF extension. In this paper, a new kind of phase mask, called composite phase mask, is designed by combining existing phase masks. With the optimized parameters, the composite phase mask can be made even less sensitive to defocus than any single mask. At the same time, as the number of phase masks used to generate one composite phase mask increases, the DOF extension effect can also be changed. Both the simulations and experiments demonstrate the effectiveness of the composite phase masks and the work reported also enriches the phase mask family used to realize the large DOF effect.

Paper Details

Date Published: 2 December 2011
PDF: 11 pages
Proc. SPIE 8004, MIPPR 2011: Pattern Recognition and Computer Vision, 80040F (2 December 2011); doi: 10.1117/12.900250
Show Author Affiliations
Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
State Key Lab. of Transient Optics and Photonics (China)
Hongwei Yi, Xi'an Institute of Optics and Precision Mechanics (China)
Yingcai Li, Xi'an Institute of Optics and Precision Mechanics (China)

Published in SPIE Proceedings Vol. 8004:
MIPPR 2011: Pattern Recognition and Computer Vision
Jonathan Roberts; Jie Ma, Editor(s)

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