Optical Design and Engineering

Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

[+] Author Affiliations
Van Nhu Le, Zhigang Fan, Shouqian Chen

Harbin Institute of Technology, School of Astronautics, 92 West Dazhi Street, Harbin 150001, China

Nghia Pham Minh

Harbin Institute of Technology, School of Electronics and Information Engineering, 92 West Dazhi Street, Harbin 150001, China

Opt. Eng. 54(3), 035103 (Mar 04, 2015). doi:10.1117/1.OE.54.3.035103
History: Received September 13, 2014; Accepted February 16, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Van Nhu Le ; Zhigang Fan ; Nghia Pham Minh and Shouqian Chen
"Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems", Opt. Eng. 54(3), 035103 (Mar 04, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.035103


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