Improved Method of Target Detection on Optoelectronic Hybrid Joint Transform Correlator in Cluttered Scences
A classical joint transform correlator (JTC) usually yields large correlation sidelobes as well as a large correlation peak width, strong zero-order peak, and low diffraction efficiency, which make the detection ability of JTC lower. To overcome these difficulties, firstly, a joint power spectrum (JPS) subtraction technique in Fourier plane was proposed, where reference image power spectrum and object image power spectrum are subtracted from the JPS before inverse Fourier-transform operation, it is obvious that the modified JPS removes the zero-order term. Secondly, a fringe-adjusted filter (FAF) was presented to suppress sidelobes and noises. The modified JPS is multiplied by a FAF before the inverse Fouriertransform operation to obtain the cross-correlation peak. Computer simulations demonstrated the improved method can obviously remove zero-order diffraction and effectively suppress the sidelobes and noises compared with classic JTC, and then improve the detection ability for JTC. Experimental results presented the sharp correlation peak and also confirmed the method effectiveness.
Fourier optics Optoelectronic hybrid joint transform correlator Optical information processing Joint power spectrum Correlation peak
Yixian Qian Libao Yang Xiaowei Cheng Xueting Hong
Institute of Information Optics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, J
国际会议
合肥
英文
4041-4044
2011-09-23（万方平台首次上网日期，不代表论文的发表时间）