摘要
提出了一种三维混合域重建算法,该算法在垂直方位向采用空间波数域匹配滤波,结合距离水平方位域后向投影技术完成目标三维重建。与三维波数域算法相比,该算法不仅避免了复杂的三维Stolt插值,还继承了后向投影技术便于处理运动补偿的优点。相比传统的三维时域后向投影算法,该算法通过在垂直方位向的波数域处理,运算量显著减少。通过对0.2THz波段仿真和实验数据的重建,验证了算法的正确性和有效性。
A three-dimensional （3-D） image reconstruction algorithm based on mixed-domain is developed for terahertz holographic imager. Matched filtering in the spatial wave-number domain is employed to focus images in the vertical direction. Combined with back-projection technique used in the other two directions, the algorithm can focus images perfectly without complex 3-D Stolt interpolation computation compared with the frequency-wavenumber algorithm. Besides, motion compensations in the horizontal and range directions get easier to handle. The computational cost of the proposed algorithm is lower than the traditional 3-D back-projection algorithm owing to the FFT-based reconstruction in the vertical direction. Finally, some simulation and experimental imaging results are given in the 0.2 THz band to validate the algorithm.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第6期1545-1548,共4页
High Power Laser and Particle Beams
基金
中国科学院知识创新工程项目(YYYJ-1123)
关键词
混合域算法
后向投影
全息成像
三维成像
太赫兹成像
mixed-domain algorithm, back-projection, holographic imaging, three-dimensional imaging, terahertz imaging
