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Proceedings Paper

Autofocus method for amplitude and pure phase objects reconstruction in digital holography
Author(s): Huaying Wang; Aili Qin; Baoqun Zhao
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Paper Abstract

Four autofocusing evaluation functions, variance, Fourier spectrum, Gradient Square and the modified standard deviation correlation, are analyzed and demonstrated based on Fresnel transform algorithm for amplitude and pure phase objects. The results show that for amplitude objects variance function, weighted Fourier spectral function and standard deviation correlation function, which get the maximum at the focus plane, are the optimal autofocusing evaluation ones in digital micro-holography. Moreover, Fourier spectral evaluation function is the preferred function. For pure phase objects the weighted Fourier spectral function, the gradient square function and the modified standard deviation correlation function, which get the minimum value at the focus plane, are available in digital holographic autofocusing. The focusing calculating time with the gradient square function is more longer than others.

Paper Details

Date Published: 24 November 2009
PDF: 5 pages
Proc. SPIE 7513, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Process Technology, 75131Z (24 November 2009); doi: 10.1117/12.838006
Show Author Affiliations
Huaying Wang, Hebei Univ. of Engineering (China)
Aili Qin, Hebei Univ. of Engineering (China)
Baoqun Zhao, Hebei Univ. of Engineering (China)


Published in SPIE Proceedings Vol. 7513:
2009 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Process Technology
Toru Yoshizawa; Ping Wei; Jesse Zheng, Editor(s)

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