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Study on the dependence of the contrast of image speckles produced by strong scattering-object on random surface and imaging system

Zhang Ning-Yu Ren Xiao-Rong Teng Shu-Yun Xu Zhi-Zhan Song Hong-Sheng Cheng Chuan-Fu

Study on the dependence of the contrast of image speckles produced by strong scattering-object on random surface and imaging system

Zhang Ning-Yu, Ren Xiao-Rong, Teng Shu-Yun, Xu Zhi-Zhan, Song Hong-Sheng, Cheng Chuan-Fu
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  • Abstract views:  3490
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  • Received Date:  02 September 2003
  • Accepted Date:  08 May 2004
  • Published Online:  05 January 2005

Study on the dependence of the contrast of image speckles produced by strong scattering-object on random surface and imaging system

  • 1. (1)山东建筑工程学院,济南 250014; (2)山东师范大学物理系,济南 250014; (3)中国科学院上海光学与精密机械研究所,上海 201800; (4)中国科学院上海光学与精密机械研究所,上海 201800;山东师范大学物理系,济南 250014

Abstract: We study the statistical properties of the image speckles produced by strongscattering objects in the 4f optical imaging system. Using the generic expression of the complex amplitude of speckles and the approximation of the doubleexponential function, we first obtain the ensemble average of the speckle intensity. Then we derive the variance of the speckle intensity based on the rotational transformation of the real and imaginary parts of the complex amplitude of speckles. We finally obtain the expression for the contrast of the speckles, which is explicitly related to the statistical parameters of random surface and to the parameters of the imaging system. Our results are an obvious improvement compared with those reported in the literature, where the relations including such implicit quantities as the average size of the scattering grains of the random surface and the number of scattering grains are usually used. The results of this paper would be helpful for the characterization of random surface by speckle contrast.

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