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9 November 2018 Precision focus plane searching in digital holography using axial adjacent amplitude similarity
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Abstract
A method of automatic focus searching is present that calculates the similarity degree of the two amplitude terms reconstructed with a fixed interval. It is based on the optical field distribution characteristics in a diffraction-limited system, as which a digital holography imaging can be described. The supportive theory is briefed in this paper, and then several typical similarity algorithms are introduced that are used as the focus degree measurement. The autofocus procedure and precisely focus searching of this proposed autofocusing method are given. Each similarity algorithm based autofocusing is validated in simulation. The results demonstrate their applicability and reliability.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aga He "Precision focus plane searching in digital holography using axial adjacent amplitude similarity ", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108181Q (9 November 2018); https://doi.org/10.1117/12.2500858
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