Noise suppression with double image spectrum extraction and Hadamard calculation in digital holography

In this paper, we describe an approach, which uses dual reference beams yet a single shot to record the hologram, and reconstructs object wave-field subsequently by extracting double image spectra and using Hadamard transform. In this way, the noises are completely suppressed without any spectrum loss to the reconstructed object image, even if the image and the dc term are in close proximity to each other. Thus, the space bandwidth can be guaranteed, as long as the image and the dc term do not overlap each other.