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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8126–8134

Sub-surface terahertz imaging through uneven surfaces: visualizing Neolithic wall paintings in Çatalhöyük

Gillian C. Walker, John W. Bowen, Wendy Matthews, Soumali Roychowdhury, Julien Labaune, Gerard Mourou, Michel Menu, Ian Hodder, and J. Bianca Jackson  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 8126-8134 (2013)
http://dx.doi.org/10.1364/OE.21.008126


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Abstract

Pulsed terahertz imaging is being developed as a technique to image obscured mural paintings. Due to significant advances in terahertz technology, portable systems are now capable of operating in unregulated environments and this has prompted their use on archaeological excavations. August 2011 saw the first use of pulsed terahertz imaging at the archaeological site of Çatalhöyük, Turkey, where mural paintings dating from the Neolithic period are continuously being uncovered by archaeologists. In these particular paintings the paint is applied onto an uneven surface, and then covered by an equally uneven surface. Traditional terahertz data analysis has proven unsuccessful at sub-surface imaging of these paintings due to the effect of these uneven surfaces. For the first time, an image processing technique is presented, based around Gaussian beam-mode coupling, which enables the visualization of the obscured painting.

© 2013 OSA

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.0100) Image processing : Image processing

ToC Category:
Imaging Systems

History
Original Manuscript: January 9, 2013
Revised Manuscript: March 7, 2013
Manuscript Accepted: March 10, 2013
Published: March 27, 2013

Citation
Gillian C. Walker, John W. Bowen, Wendy Matthews, Soumali Roychowdhury, Julien Labaune, Gerard Mourou, Michel Menu, Ian Hodder, and J. Bianca Jackson, "Sub-surface terahertz imaging through uneven surfaces: visualizing Neolithic wall paintings in Çatalhöyük," Opt. Express 21, 8126-8134 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-8126


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