Application of autofocus algorithms in holographic reconstruction

Abstract

A digital holographic reconstruction in the frequency and spatial domain is presented in this paper. This technique applies Fourier transform on heterodyne hologram with interference fringes then the complex amplitude and phase information are extracted from its sidebands. Reconstruction of the phase and amplitude image is completed through inverse Fourier transform back to spatial domain. For best holographic reconstruction qualities, a blind deconvolution filtering and an image based autofocus spatial processing are also adopted and discussed. Experiments show satisfying reconstruction results.

Off-Axis Digital Holographic Reconstruction Based on the Spatial Filtering of the Hologram Illuminated with the Reference Wave

“…Hence, we just consider the size of filtering window. In this paper, we adopt Gaussian low pass filter [13] to extract the spectrum of real image (See Figure2 below).…”