Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Point Spread Function Estimation for a Terahertz Imaging System | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 575817 8 pages doi 2010 575817 Research Article Point Spread Function Estimation for a Terahertz Imaging System Dan C. Popescu and Andrew D. Hellicar Wireless and Networking Technologies Laboratory CSIRO ICT Centre Marsfield NSW 2121 Australia Correspondence should be addressed to Dan C. Popescu Received 18 June 2010 Accepted 26 August 2010 Academic Editor Enrico Capobianco Copyright 2010 D. C. Popescu and A. D. Hellicar. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. We present a method for estimating the point spread function of a terahertz imaging system designed to operate in reflection mode. The method is based on imaging phantoms with known geometry which have patterns with sharp edges at all orientations. The point spread functions are obtained by a deconvolution technique in the Fourier domain. We validate our results by using the estimated point spread functions to deblur several images of natural scenes and by direct comparison with a point source response. The estimations turn out to be robust and produce consistent deblurring quality over the entire depth of the focal region of the imaging system. 1. Introduction Imaging systems operating in the terahertz THz region of the spectrum have the potential to enable new applications due to the unique combination of properties that occur in this region such as penetration through clothes packaging and plastics and also the fact that THz waves are nonionising and hence do not pose a health hazard for humans. Application domains such as security 1 medical imaging 2 and nondestructive testing 3 are likely to benefit from developments in this area. Despite these advantages commercial systems in this spectral region have .
