Sparsity based Terahertz reflective off-axis digital holography
|Title:||Sparsity based Terahertz reflective off-axis digital holography||Authors:||Wan, Min
Ryle, James P.
Healy, John J.
Sheridan, John T.
|Permanent link:||http://hdl.handle.net/10197/8721||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 sensing; Terahertz imaging; Digital holography; Sparsity||DOI:||10.1117/12.2264788
|Language:||en||Status of Item:||Peer reviewed||Is part of:||Hrabovský, 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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