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Proceedings Paper

Sparsity based terahertz reflective off-axis digital holography
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Paper Abstract

Terahertz radiation lies between the microwave and infrared regions in the electromagnetic spectrum. Emitted frequencies range from 0.1 to 10 THz with corresponding wavelengths ranging from 30 μm to 3 mm. In this paper, a continuous-wave Terahertz off-axis digital holographic system is described. A Gaussian fitting method and image normalisation techniques were employed on the recorded hologram to improve the image resolution. A synthesised contrast enhanced hologram is then digitally constructed. Numerical reconstruction is achieved using the angular spectrum method of the filtered off-axis hologram. A sparsity based compression technique is introduced before numerical data reconstruction in order to reduce the dataset required for hologram reconstruction. Results prove that a tiny amount of sparse dataset is sufficient in order to reconstruct the hologram with good image quality.

Paper Details

Date Published: 15 May 2017
PDF: 6 pages
Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330T (15 May 2017); doi: 10.1117/12.2264788
Show Author Affiliations
Min Wan, Beijing Univ. of Technology (China)
Univ. College Dublin (Ireland)
Inbarasan Muniraj, Univ. College Dublin (Ireland)
Ra'ed Malallah, Univ. College Dublin (Ireland)
Univ. of Basrah (Iraq)
Liang Zhao, Univ. College Dublin (Ireland)
James P. Ryle, Univ. College Dublin (Ireland)
Lu Rong, Beijing Univ. of Technology (China)
John J. Healy, Univ. College Dublin (Ireland)
Dayong Wang, Beijing Univ. of Technology (China)
John T. Sheridan, Univ. College Dublin (Ireland)


Published in SPIE Proceedings Vol. 10233:
Holography: Advances and Modern Trends V
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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