Edge enhancement in three-dimensional vortex imaging based on FINCH by Bessel-like spiral phase modulation

PLUTO / PLUTO-2 Spatial Light Modulators
Imaging/ Image Processing
Published on:
Authors: Jiuru He, Pengwei Zhang, Jianpo Su, Junqiao Wang, Yongzhi Tian, Yongsheng Hu, and Fengying Ma
Abstract:

Edge enhancement, as an important part of image processing, has played an essential role in amplitude-contrast and phase-contrast object imaging. The edge enhancement of three-dimensional (3D) vortex imaging has been successfully implemented by Fresnel incoherent correlation holography (FINCH), but the background noise and image contrast effects are still not satisfactory. To solve these issues, the edge enhancement of FINCH by employing Bessel-like spiral phase modulation is proposed and demonstrated. Compared with the conventional spiral phase modulated FINCH, the proposed technique can achieve high-quality edge enhancement 3D vortex imaging with lower background noise, higher contrast and resolution. The significantly improved imaging quality is mainly attributed to the effective sidelobes’ suppression in the generated optical vortices with the Bessel-like modulation technique. Experimental results of the small circular aperture, resolution target, and the Drosophila melanogaster verify its excellent imaging performance. Moreover, we also proposed a new method for selective edge enhancement of 3D vortex imaging by breaking the symmetry of the spiral phase in the algorithmic model of isotropic edge enhancement. The reconstructed images of the circular aperture show that the proposed method is able to enhance the edges of the given objects selectively in any desired direction.

Open Access

Publication: Optics Express
Issue/Year: Opt. Express 32, 1438-1450 (2024)
DOI: 10.1364/OE.511205
Link: https://doi.org/10.1364/OE.511205

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