摘要
提出一种基于傅里叶变换解相法的像增强管成像质量多参数同时测量的新方法。将一正弦光栅图输入到像增强管,如果像增强管成像质量存在问题,将使图像输出发生改变,形成一变形条纹,采用傅里叶变换解相法对输出的变形条纹进行解相,可同时获得放大率、放大率不均匀度、枕形畸变、桶形畸变、蛇形畸变、剪切畸变等相关信息,对测量系统进行标定,即可实现对上述参数的同时测量。实验测得中心放大率与设定放大率的差值到了10-3量级,测得的畸变和畸变真值两者差异在0.4pixel以内,结果证明了方法的有效性。
An imaging quality measuring method of image intensifier is presented,which can obtain many characters simultaneously by Fourier transform phase measurement.When a sinusoidal pattern is the input,a deformed fringe pattern will be the output if there is any imaging quality problem in the image intensifier.Obtaining the phase changes of the deformed fringe pattern by Fourier transform phase measurement can extract the information of magnification,magnification inhomogeneity,pillow-shaped distortion,barrel-shaped distortion,snake-shaped distortion,and shearing distortion.And after the calibration of the measurement system,the above parameters can be derived simultaneously.The experimental results show that,the measured central magnification has a difference of the magnitude of 10-3 relative to the designed value,and the measured distortion has an error within 4 pixels,testifying the validity of the presented methed.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2011年第10期2678-2682,共5页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
国家重大专项项目(2009ZX02204-008)
四川省学术和技术带头人培养基金项目(07GRC-01)
关键词
像增强管
傅里叶变换解相法
相位测量
枕形畸变
蛇形畸变
剪切畸变
image intensifier
Fourier transform phase measurement
phase measurement
pillow-shaped distortion
snake-shaped distortion
shearing distortion
