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Optical Engineering

Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems
Author(s): Van Nhu Le; Zhigang Fan; Nghia Pham Minh; Shouqian Chen
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Paper Abstract

Wavefront coding involves the use of an asymmetrical phase mask to extend the depth of field of incoherent imaging systems. The performance of wavefront coding systems depends on designing a suitable phase profile to generate the defocus-invariant imaging characteristic. We proposed a square-root phase mask with two profile factors for achieving a steadier defocused modulation transfer function (MTF). Several evaluation methods are employed for the purpose of performance comparison between the proposed phase mask and the previously suggested phase masks under the constraint condition that the phase parameters are optimized at the same level of noise gain. Numerical results show that the square-root phase mask yields better properties in extended depth of field imaging, especially in acquiring defocus-invariant MTFs and eliminating image artifacts associated with the decoded images.

Paper Details

Date Published: 4 March 2015
PDF: 7 pages
Opt. Eng. 54(3) 035103 doi: 10.1117/1.OE.54.3.035103
Published in: Optical Engineering Volume 54, Issue 3
Show Author Affiliations
Van Nhu Le, Harbin Institute of Technology (China)
Zhigang Fan, Harbin Institute of Technology (China)
Nghia Pham Minh, Harbin Institute of Technology (China)
Shouqian Chen, Harbin Institute of Technology (China)

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