Real-time processing of off-axis interferograms: from the camera to the user

Pinhas Girshovitz; Tamir Gabay; Natan T. Shaked

doi:10.1117/12.2064447

18 August 2014 Real-time processing of off-axis interferograms: from the camera to the user

Pinhas Girshovitz, Tamir Gabay, Natan T. Shaked

Proceedings Volume 9203, Interferometry XVII: Techniques and Analysis; 920304 (2014) https://doi.org/10.1117/12.2064447
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

We review new algorithms that have been presented by us lately¹ for fast reconstruction and phase unwrapping of sample wave-fronts recorded using off-axis digital holographic imaging. These algorithms enable reconstruction and phase unwrapping of sample wave-fronts up to 16 times faster than the conventional Fourier-based reconstruction algorithm. The algorithms exploit the compression properties of holographic imaging for decreasing the calculation complexity required for extracting the sample wave-front from the recorded interferogram. Using the presented algorithms, we were able to reconstruct, for the first time, 1 Mega pixels off-axis interferograms in more than 30 frames per second using a standard single-core personal computer on a Matlab-Labview interface, without using a graphic processing-unit programming or parallel computing. This computational speedup is important for real-time visualization, calculation and data extraction for dynamic samples and processes that are evaluated using off-axis digital holography such as biological cell imaging and real-time nondestructive testing.

Citation Download Citation

Pinhas Girshovitz, Tamir Gabay, and Natan T. Shaked "Real-time processing of off-axis interferograms: from the camera to the user", Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 920304 (18 August 2014); https://doi.org/10.1117/12.2064447

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