Title :
Optimization-Based Terahertz Imaging
Author :
Tsai, Hsiao-Rho ; Enderli, Florian ; Feurer, Thomas ; Webb, Kevin J.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
A terahertz (THz) imaging modality based on nonlinear optimization that is not limited by weak scatter or low refractive index is presented. Two-dimensional reconstructions of sub-wavelength dielectric cylinders in air are performed through iterative coordinate descent (ICD) optimization in a Bayesian framework using experimental data obtained by illuminating the objects with a THz beam. Strategies for avoiding local minima and to allow for faster convergence and improved image quality are presented and evaluated.
Keywords :
Bayes methods; image reconstruction; iterative methods; optimisation; refractive index; terahertz wave imaging; Bayesian framework; ICD optimization; THz beam; THz imaging modality; image quality; iterative coordinate descent optimization; nonlinear optimization; optimization-based terahertz imaging; refractive index; subwavelength dielectric cylinders; terahertz imaging modality; two-dimensional reconstructions; Detectors; Dielectric constant; Image reconstruction; Imaging; Laser beams; Mathematical model; Optimization; Optimization; terahertz (THz) imaging;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2012.2208192
