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15 April 2019 Autofocusing in dual-wavelength digital holography using correlation coefficient
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An autofocusing method using correlation coefficient (CC) is proposed for dual-wavelength off-axis digital holography. The complex amplitudes of the object wave relative to the two wavelengths are first retrieved at different reconstruction distances, and the correlation degrees are then calculated between the two complex amplitudes. Considered the diffraction independency between the two wavelengths, the maximum CC is employed to automatically determine the focus plane. Our method can be applicable for the amplitude, phase, or both mixed sample. The experimental results demonstrate that the proposed method can enable automatically autofocusing with higher resolution in contrast to the state-of-the-art method.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE
Zhi Zhong, Xiaoxin Xie, Lei Liu, Cheng Wang, Mingguang Shan, and Bin Liu "Autofocusing in dual-wavelength digital holography using correlation coefficient," Optical Engineering 58(4), 043103 (15 April 2019).
Received: 23 January 2019; Accepted: 3 April 2019; Published: 15 April 2019

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