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《Optics and Precision Engineering》 2010-04
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Image restoration of 4f information optic systems by step-response

XU Xin,TIAN Feng-chun,JI Yan-li,LI Li (College of Communication Enginnering,Chongqing University,Chongqing 400030,China)  
The output images from a conventional 4f information optical system are characterized by their limited frequency bands,random noises and coherent noises in coexistence.Therefore,when those images are restored,it is necessary to protect image details better and to remove the noises in high frequency domain and the coherent fringes in low frequency domain.According to these characteristics,a new method is proposed to restore 4f system images and to improve the image quality.Firstly,the step response image of the 4f system is used to obtain the prior knowledge of the coherent noise,then the step response and pending images are processed to remove the high frequency random noise in contourlet domain.Finally,based on the linear characteristics of 4f system,the pixel value of the pending image divides the pixel value of step response image from point to point to remove the coherent noise.Experiments demanstrate that the method can restore images and protect image details well and its Peak Signal to Noise Ratio(PSNR)and Structural Similarity Index(SSIM) have improved by 5 db and 6%,respectively.These results show that the proposed method is suitable for 4f optical systems.
【Fund】: 国家自然科学基金资助项目(No.60472037);; 中国博士后科学基金资助项目(No.20080430096)
【CateGory Index】: TP391.41
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【Citations】
Chinese Journal Full-text Database 5 Hits
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【Co-citations】
Chinese Journal Full-text Database 10 Hits
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6 LU Gang1,YAN Jing-wen2,KOU Ye-quan1,ZHANG Jian-zhong1(1.Department of Communication Engineering,Xiamen University,Xiamen 361005,China;2.Department of Electronic Engineering,Shantou University,Shantou 515063,China);Dual-tree complex wavelet image denoising based on parental and neighboring coefficients[J];Optics and Precision Engineering;2009-04
7 GONG Wei-guo,LIU Xiao-ying,LI Wei-hong,LI Jian-fu(Key Laboratory for Optoelectronic Technology and System of the Ministry of Education, Chongqing University,Chongqing 400030,China);Local adaptive image denoising based on double-density dual-tree complex wavelet transform[J];Optics and Precision Engineering;2009-05
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10 ZENG Li1,2,GUO Hai-yan2,MA Rui2 (1.ICT Research Center,Key Laboratory of Optoelectronic Technology and System of the Ministry of Education,Chongqing University,Chongqing 400044,China;2.College of Mathematics and Physics,Chongqing University,Chongqing 400044,China);Edge detection of industrial CT 3D image based on wavelet locating and Facet model[J];Optics and Precision Engineering;2010-02
【Secondary Citations】
Chinese Journal Full-text Database 10 Hits
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6 LI Xin-zhong1,2,DAI Qin1,2,WANG Xi-jun1,2, J.W.Seo3 (1.Changchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130031,China; 2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China;3.School of Electronic and Electrical Engineering,Hongik University,72-1 Sangsu-dong,Mapo-gu,Seoul 121-791,South Korea);Digital speckle correlation method of multi-scale wavelet noise reduction[J];Optics and Precision Engineering;2007-01
7 TONG Wu-qin1,LING Yong-shun1,HUANG Chao-chao1,YANG Hua1,FAN Xiang2 (1.Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province,PLA Electronic Engineering Institute,Hefei 230037,China;2.University of Science and Technology of China,Hefei 230031,China);Processing method of IR image based on mathematical morphology and wavelet transform[J];Optics and Precision Engineering;2007-01
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9 ZHAO Xiu-ying1,2,3,ZHAI Lin-pei1,SHANG Yu-feng3,LIU Hong1,2,3,FU De-you3(1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China;2.Graduate School of the Chinese Academy of Science,Beijing 100039,China;3.Aviation University of Air Force,Changchun 130022,China.);Lifting scheme design of biorthogonal wavelet for aviation image compression[J];Optics and Precision Engineering;2007-09
10 CAI De,YAN Ying-bai,JIN Guo-fan(Department of Precision Instruments,Tsinghua University,Beijing 100084,China);Improving optical wavelet transform by optical separable wavelet transform[J];Optical Technique;2006-02
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