Auto-focus of Optical Scanning Holographic Microscopy Using Partial Region Analysis

In this paper, we propose an auto-focusing algorithm which extracts a depth parameter by analyzing a selected part of a hologram, and we use experimental results to show that the algorithm is practical. First, we record a complex hologram using Optical Scanning Holography. Next we select some part of hologram and extract depth information through Gaussian low pass filtering, synthesizing a real-only hologram, power fringe-adjusted filtering and inverting to a new frequency axis. Finally, we reconstruct the hologram automatically using the extracted depth location.Keywords: Digital holography, Holography, Optical scanning holography, Auto-focusingOCIS codes: (090.1995) Digital holography; (070.0070) Fourier optics and signal processing

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