便携式X-射线透视仪图像非均匀性分析及校正  

Analysis and Correction for Image Nonuniformity of Portable X-Ray Perspective Instruments

作　　者：戚琦[1] 路宏年[1] 李俊江[1] 郎田 杨民[1] 

机构地区：[1]北京航空航天大学机械与自动化学院,北京100083 [2]总装备部北京军代局,北京100042

出　　处：《测试技术学报》2007年第4期336-340,共5页Journal of Test and Measurement Technology

基　　金：北京市科技新星计划(A)基金资助项目(2005A14)

摘　　要：从射线场强度的非均匀性、转换屏响应不一致性和CCD相机像元光电响应不一致性三方面对便携式X射线透视仪图像非均匀性的产生机理进行了理论分析.并在此基础上建立了透视仪每个像元通道光电响应的数学模型.基于该模型,提出了一种多点线性拟合校正算法.给出了应用本方法校正前后的图像结果及标准差对比情况.本方法已应用于便携式安检排爆X-射线检测系统.Reasons of image nonuniformity of portable X-ray perspective instruments are theoretically analyzed from three aspects including the nonuniformity of X-ray intensity, the response disagreements of the scintillator and the pixels of a CCD camera. A linear photoelectric response model for each pixel channel in perspective instruments is presented. Based on this model, a multipoint linear fitting correction algorithm is proposed. The original images, result images processed by this method and the standard deviations for these images are given. The algorithm has been applied to portable X-ray imaging systems for security inspection.

关 键 词：射线成像 像元响应一致性 非均匀性校正 线性校正 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]