title: Off-axis compressed holographic microscopy in low-light conditions.
abstract: This Letter reports a demonstration of off-axis compressed holography in low-light level imaging conditions. An acquisition protocol relying on a single exposure of a randomly undersampled diffraction map of the optical field, recorded in the high heterodyne gain regime, is proposed. The image acquisition scheme is based on compressed sensing, a theory establishing that near-exact recovery of an unknown sparse signal is possible from a small number of nonstructured measurements. Image reconstruction is further enhanced by introducing an off-axis spatial support constraint to the image estimation algorithm. We report accurate experimental recovering of holographic images of a resolution target in low-light conditions with a frame exposure of 5 μs, scaling down measurements to 9% of random pixels within the array detector.
authors.affiliation: Institut Pasteur, Unité d'Analyse d'Images Quantitative, CNRS Unité de Recherche Associée 2582, 25-28 rue du Docteur Roux, 75015 Paris, France.
authors.forename: Marcio
authors.initials: M
authors.lastname: Marim
authors.forename: Elsa
authors.initials: E
authors.lastname: Angelini
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Olivo-Marin
authors.forename: Michael
authors.initials: M
authors.lastname: Atlan
mesh_terms: D006696:Holography / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008027:Light; D008853:Microscopy / Q000379:methods*