Sparsity promoting automatic focusing in digital holography

Pasquale Memmolo; Melania Paturzo; Bahram Javidi; Paolo Antonio Netti; Pietro Ferraro

doi:10.1117/12.2185015

22 June 2015 Sparsity promoting automatic focusing in digital holography

Pasquale Memmolo, Melania Paturzo, Bahram Javidi, Paolo Antonio Netti, Pietro Ferraro

Proceedings Volume 9525, Optical Measurement Systems for Industrial Inspection IX; 95250J (2015) https://doi.org/10.1117/12.2185015
Event: SPIE Optical Metrology, 2015, Munich, Germany

Abstract

Sparsity properties of digital holograms have been investigated for application in compressive holography, permitting the discovery of the sparsest reconstruction plane in which the recovery of digital holograms is suitable. Recent approaches for denoising and phase retrieval are also proposed exploiting the sparsity properties of digital holograms. Thus it can be shown a strong correlation between holograms sparsity and focal plane detection, making a sparsity measure coefficient as a candidate to be used for focus plane calculation. Here we implement different sparsity metrics, that are able to measure a degree of sparsity of reconstructed digital hologram and we investigate their relation with the automatic focusing criterions, highlighting the possibility to use a sparsity measure as refocusing metric as well as the contrary, i.e. using image contrast coefficients as sparsity measures. Our analysis will be reported for digital holograms recorded in both lensless and microscope configuration and for both amplitude and pure-phase objects.

Citation Download Citation

Pasquale Memmolo, Melania Paturzo, Bahram Javidi, Paolo Antonio Netti, and Pietro Ferraro "Sparsity promoting automatic focusing in digital holography", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95250J (22 June 2015); https://doi.org/10.1117/12.2185015

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