title: Genetic algorithms applied to reconstructing coded imaging of neutrons and analysis of residual watermark.
abstract: Monte-Carlo simulation of neutron coded imaging based on encoding aperture for Z-pinch of large field-of-view with 5 mm radius has been investigated, and then the coded image has been obtained. Reconstruction method of source image based on genetic algorithms (GA) has been established. "Residual watermark," which emerges unavoidably in reconstructed image, while the peak normalization is employed in GA fitness calculation because of its statistical fluctuation amplification, has been discovered and studied. Residual watermark is primarily related to the shape and other parameters of the encoding aperture cross section. The properties and essential causes of the residual watermark were analyzed, while the identification on equivalent radius of aperture was provided. By using the equivalent radius, the reconstruction can also be accomplished without knowing the point spread function (PSF) of actual aperture. The reconstruction result is close to that by using PSF of the actual aperture.
authors.affiliation: School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Tiankui
authors.initials: T
authors.lastname: Zhang
authors.forename: Huasi
authors.initials: H
authors.lastname: Hu
authors.forename: Qinggang
authors.initials: Q
authors.lastname: Jia
authors.forename: Fengna
authors.initials: F
authors.lastname: Zhang
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.forename: Zhenghong
authors.initials: Z
authors.lastname: Li
authors.forename: Yuelei
authors.initials: Y
authors.lastname: Wu
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Liu
authors.forename: Guang
authors.initials: G
authors.lastname: Hu
authors.forename: Wei
authors.initials: W
authors.lastname: Guo
mesh_terms: D000465:Algorithms; D056084:Genetic Fitness; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008957:Models, Genetic; D009010:Monte Carlo Method; D009502:Neutrons