Precision focus plane searching in digital holography using axial adjacent amplitude similarity

Aga He

doi:10.1117/12.2500858

9 November 2018 Precision focus plane searching in digital holography using axial adjacent amplitude similarity

Aga He

Proceedings Volume 10818, Holography, Diffractive Optics, and Applications VIII; 108181Q (2018) https://doi.org/10.1117/12.2500858
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

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.

Citation Download Citation

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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