Fast Holographic Image Reconstruction Using Phase Shifting-assisted Depth Detection Scheme in Optical Scanning Holography

Abstract

For the implementation of a real-time holographic camera, fast and automatic holographic image reconstruction is an essential technology. In this paper, we propose a new automatic depth detection algorithm for fast holography reconstruction, which is especially useful in optical scanning holography. The proposed algorithm is based on the inherent phase difference information in the heterodyne signals and works without any additional optical or electrical components. An optical scanning holography setup was made using a heterodyne frequency of 4 MHz with a 500-mm distance and 5-mm depth resolution. The reconstruction processing time was measured as 0.76 s, showing a 62% time reduction compared to a recent previous work.