Phase Retrieval of On-Axis Digital Holography With Modified Coherent Diffraction Imaging

Abstract

In this paper, a phase retrieval method is proposed to reconstruct the high-quality image free from undesired terms in on-axis digital holography (DH) with modified coherent diffraction imaging (MCDI). A random phase plate (RPP) is applied to generate a modulated diffraction pattern which forms an on-axis digital hologram with a plane reference wave, and a proper iterative algorithm is designed to reconstruct high-quality object information from both on-axis digital hologram and modulated diffraction pattern. Numerical simulations and experiments prove that both modulus and phase distributions can be accurately reconstructed within 100 iterations while the undesired twin image and zero-order diffraction can be effectively removed, thus demonstrating the feasibility of the suggested method.

Interference Stripe Noise Reduction of CMOS Sensor-Based Digital Holographic Measurement System

“…After a careful analysis and simulation of the optic path of the CMOS sensor-based DHM system, we think the ISNs mainly come from the complex interference of the input beams and their reflection ones which are mainly created from the unparallel assembly of the optic filter and the CMOS sensor. The micro distortions of optic components and coatings also contribute to that degradation [32] to some extent. From the image processing point of view, the image quality metrics can be used to represent the noise contamination degree of digital holographic image.…”

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

“…To improve the resolution of of-axis DH. He et al [12] suggested a reconstruction algorithm (WDH) based on the wavefront coding, which combines phase recovery technology (PR) [13] and of-axis DH, using a reference wave as an encoding wave, and employs a band-pass flter with increased bandwidth to retrieve spectrum information. Tis method improves the resolution of of-axis DH, but requires high accuracy in collimation and reconstruction of the reference, which generally leads to a reduced feld-of-view (FOV).…”