Sparsity based Terahertz reflective off-axis digital holography

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Title: Sparsity based Terahertz reflective off-axis digital holography
Authors: Wan, Min
Muniraj, Inbarasan
Malallah, Ra'ed
Zhao, Liang
Ryle, James P.
Rong, Lu
Healy, John J.
Wang, Dayong
Sheridan, John T.
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Date: 24-Apr-2017
Online since: 2017-08-17T15:47:17Z
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 m 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.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: Society of Photo-optical Instrumentation Engineers (SPIE)
Copyright (published version): 2017 SPIE
Keywords: Personal sensingTerahertz imagingDigital holographySparsity
DOI: 10.1117/12.2264788
Language: en
Status of Item: Peer reviewed
Is part of: Hrabovsk√Ĺ, M., Sheridan, J. T. and Fimia, F. (eds.). Holography: Advances and Modern Trends V (Volume 10233)
Conference Details: Holography: Advances and Modern Trends V, Prague, Czech Republic, 24 April 2017
Appears in Collections:Electrical and Electronic Engineering Research Collection
Insight Research Collection

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