[1] ARMSTRONG C M. The truth about terahertz[J]. IEEE Spectrum, 2012,49(9):36-41.
[5] COOPER K B,DENGLER R J,LLOMBART N,et al. THz imaging radar for standoff personnel screening[J]. IEEE Transactions on Terahertz Science and Technology, 2011,1(1):169-182.
[10] GONZALEZ R C,WOODS R E,EDDINS S L. Digital image processing using MATLAB[M]. Beijing:Electronics Industry Publishing House, 2004.
[11] OTSU N. A threshold selection method from gray-level histograms[J]. IEEE Transactions on Systems,Man,and Cybernetics, 1979,9(1):62-66.
[12] KAPUR J N,SAHOO P K,WONG A K. A new method for gray-level picture thresholding using the entropy of the histogram[J]. Computer Vision,Graphics, and Image Processing, 1985,29(3):273-285.
[13] CHEN W T,WEN C H,YANG C W. A fast two-dimensional entropic thresholding algorithm[J]. Pattern Recognition, 1994,27(7): 885-893.
[14] SUZUKI S. Topological structural analysis of digitized binary images by border following[J]. Computer Vision,Graphics, and Image Processing, 1985,30(1):32-46.