In-Line and Off-Axis Hybrid Digital Holographic Imaging Method Based on Off-Axis Hologram Constraints

Abstract

We put forward a novel hybrid iterative algorithm to improve the imaging quality of digital holography. An off-axis hologram is added to the iteration process via interference and inverse interference process and becomes part of the constraints. A frequency domain filter varying with the number of iterations is used to improve the competitive advantage of low frequency information in the early iterations, while retaining the high frequency information. In practical applications, an additional iterative process is used after averaging filtering to suppress the influence of the imperfect consistency between the reconstructed reference wave and the actual reference wave. Numerical simulations and experiments show that image reconstruction may be significantly improved compared to the conventional method.

Accurate phase reconstruction in digital holography microscopy using Fresnel biprism

“…The observed amplitude and phase information may be distorted and inaccurate if these methods are not chosen properly. There are two main types of DHM configurations 12 namely, in-line DHM and off-axis DHM, and the difference lies in the angle between the object beam and the reference beam.…”