TY - GEN
T1 - A novel optical-mechanical scanning passive THz imaging system
AU - Dong, Liquan
AU - Zhu, Weiwen
AU - Zhao, Yuejin
AU - Liu, Xiaohua
AU - Zhang, Jingshui
AU - Liu, Weiyu
AU - Zhou, Xiaoxiao
PY - 2012
Y1 - 2012
N2 - A novel passive THz imaging system of single channel and optical-mechanical scanning is described. It employs a Cassegrain antenna of 390mm in diameter, and achieves the two-dimensional scanning imaging via the cooperation of a line scanning mirror, driven by a crank-rocker mechanism in a high speed, and the motion of the frame scanning mirror. Thus, the system has many advantages such as low cost, simple structure, efficient and so on. The single frame imaging time of the system is only 20s, the field of view (FOV) is 30°× 36°, and the angle resolution is up to 0.6°. The experimental results show that the system can image the human body, and effectively detect dangerous items concealed under the clothes. For the images, processed by a sparse representation-based image denoising and inpainting algorithm, which generalizing the K-Means clustering process, for adapting dictionaries in order to achieve sparse signal representations. The processed image quality is improved obviously. The experimental results demonstrate, better RMSE and highest Peak Signal-to-Noise Ratio (PSNR) compared with traditional methods can be obtained.
AB - A novel passive THz imaging system of single channel and optical-mechanical scanning is described. It employs a Cassegrain antenna of 390mm in diameter, and achieves the two-dimensional scanning imaging via the cooperation of a line scanning mirror, driven by a crank-rocker mechanism in a high speed, and the motion of the frame scanning mirror. Thus, the system has many advantages such as low cost, simple structure, efficient and so on. The single frame imaging time of the system is only 20s, the field of view (FOV) is 30°× 36°, and the angle resolution is up to 0.6°. The experimental results show that the system can image the human body, and effectively detect dangerous items concealed under the clothes. For the images, processed by a sparse representation-based image denoising and inpainting algorithm, which generalizing the K-Means clustering process, for adapting dictionaries in order to achieve sparse signal representations. The processed image quality is improved obviously. The experimental results demonstrate, better RMSE and highest Peak Signal-to-Noise Ratio (PSNR) compared with traditional methods can be obtained.
UR - http://www.scopus.com/inward/record.url?scp=84873417378&partnerID=8YFLogxK
U2 - 10.1109/IRMMW-THz.2012.6380258
DO - 10.1109/IRMMW-THz.2012.6380258
M3 - Conference contribution
AN - SCOPUS:84873417378
SN - 9781467315975
T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
BT - IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves
T2 - 37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012
Y2 - 23 September 2012 through 28 September 2012
ER -