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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 7 — Jul. 1, 2010
  • pp: 1638–1646

Image reconstruction using spectroscopic and hyperspectral information for compressive terahertz imaging

Zhimin Xu and Edmund Y. Lam  »View Author Affiliations


JOSA A, Vol. 27, Issue 7, pp. 1638-1646 (2010)
http://dx.doi.org/10.1364/JOSAA.27.001638


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Abstract

Terahertz (THz) time-domain imaging is an emerging modality and has attracted a lot of interest. However, existing THz imaging systems often require a long scan time and sophisticated system design. Recently, a new design incorporating compressed sensing (CS) leads to a lower detector cost and shorter scan time, in exchange for computation in an image reconstruction step. In this paper, we develop two reconstruction algorithms that can estimate the underlying scene as accurately as possible. First is a single-band CS reconstruction method, where we show that by making use of prior information about the phase and the correlation between the spatial distributions of the amplitude and phase, the reconstruction quality can be significantly improved over previously published methods. Second, we develop a method that uses the multi-frequency nature of the THz pulse. Through effective use of the spatial sparsity, spectroscopic phase information, and correlations across the hyperspectral bands, our method can further enhance the recovered image quality. This is demonstrated by computation on a set of experimental THz data captured in a single-pixel THz system.

© 2010 Optical Society of America

OCIS Codes
(100.3010) Image processing : Image reconstruction techniques
(100.3020) Image processing : Image reconstruction-restoration
(100.3190) Image processing : Inverse problems
(110.1758) Imaging systems : Computational imaging
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Imaging Systems

History
Original Manuscript: December 10, 2009
Revised Manuscript: May 19, 2010
Manuscript Accepted: May 25, 2010
Published: June 16, 2010

Citation
Zhimin Xu and Edmund Y. Lam, "Image reconstruction using spectroscopic and hyperspectral information for compressive terahertz imaging," J. Opt. Soc. Am. A 27, 1638-1646 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-7-1638


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