安检中X光断层扫描加速迭代算法研究  

Research on Accelerating Iterative Algorithm of Security Screening by X-Ray Tomography

作　　者：陈树越[1] 徐来[1] 吴玮婕 

机构地区：[1]常州大学信息科学与工程学院,江苏常州213164 [2]香港中文大学系统工程与工程管理学系,中国香港999077

出　　处：《测控技术》2016年第12期45-48,共4页Measurement & Control Technology

基　　金：国家自然科学基金资助项目(51176016);江苏省产学研联合创新资金(BY2014037-11)

摘　　要：随着安检要求的日益提高,计算机断层扫描的安检方式正成为X光安检中越来越重要的部分。为了保证行李扫描的检测效率,加快断层扫描图像的迭代计算速度,提出了一种采用小波变换域取代图像空间来测算图像小波系数的估值方法。该方法以交替最小化算法为框架,在逼近系数时,创建一个替代函数,随着迭代次数的增加,基于同一标准的小波树得以更新扩展,每层的细节系数均更新,小波树也依此扩展,以此达到加速迭代的效果。实验结果表明,该方法比原交替最小化算法最大能减少66.7%的迭代运算次数。With the requirement of security increasing day by day,the computed tomography（CT） scan mode of X-ray inspection is becoming more and more important part of the security.In order to ensure the detection efficiency of baggage scanning and speed up the iterative calculation of tomography image,a method using the wavelet transform domain instead of the image space to measure the image wavelet coefficients of the valuation is proposed.The method takes the alternating minimization algorithm as framework and while be founded in approximation coefficients,an alternative function is created.With the increase of the number of iterations,the wavelet tree based on the same standard can be updated and expanded,in which detail coefficients of each layer are updated and wavelet tree also depends on the extension to accelerate the effect of the iteration.Experimental results show that the presented algorithm can reduce at most 66.1%of the iterative operation times compared with the alternating minimization algorithm.

关 键 词：图像处理 X光安检 计算机断层扫描 图像重建 小波变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]