title: Zero-order noise suppression with various space-shifting manipulations of reconstructed images in digital holography.
abstract: In this paper, we describe various numerical space-shifting manipulations of the reconstructed images to remove the dc noise in the reconstruction, in terms of the periodicity characteristics of images in digital holography. The theoretical interpretation on different reconstruction periods of the image and the dc noise is described in detail for the first time, to the best of our knowledge. It is related to CCD sampling periods or frequencies for the fringes and the dc term of a hologram. With the calculations of Hadamard product of two different spatially shifted images and subsequent extraction of the root of it, the dc noise can be suppressed effectively and a clear image with the original intensity contrast can be obtained at the center in the hologram reconstruction, particularly when the image and the dc noise are completely or partially superposed with each other. The experiments for both in-line and off-axis imaging cases show that all results are completely consistent with theoretical predictions.
authors.affiliation: Department of Applied Physics and Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), Beihang University, 37 Xueyuan Road, Beijing 100191, China. jwu2@buaa.edu.cn
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Ming Feng
authors.initials: MF
authors.lastname: Lu
authors.forename: Yan Chao
authors.initials: YC
authors.lastname: Dong
authors.forename: Ming
authors.initials: M
authors.lastname: Zheng
authors.forename: Meng
authors.initials: M
authors.lastname: Huang
authors.forename: Yi Nan
authors.initials: YN
authors.lastname: Wu