作　　者： ; ; ;

机构地区： 华南农业大学理学院应用物理系

出　　处： 《光电工程》 2010年第1期13-18,共6页

摘　　要： 为了测量光学成像系统的径向畸变,提出了基于伸缩窗口傅里叶变换空间载频条纹相位分析的测量新方法。畸变分布测量转化为调制相位测量。首先,将纵向朗奇基准光栅作为模板,通过成像系统成为变形光栅即畸变像。接着采用伸缩窗口傅里叶变换提取畸变载频光栅条纹中心无畸变点的基频和相位信息,获得理想无畸变像的基频成分,然后对变形载频光栅条纹进行频谱分析,滤波提取基频信息、逆傅里叶变换、相位解包,提取径向调制相位分布,计算畸变图像的径向位置畸变分布。最后利用该径向位置畸变分布规律和双线性插值灰度重建对畸变图像进行校正。详细的理论分析和实验结果证明,该方法是可行的。 In order to measure the radial distortion in optical imaging system,a new method based on carrier-fringe pattern phase analysis using dilating Gabor transform was presented,and measuring radial distortion was converted into measuring modulated phase. Firstly,a deformed grating pattern （namely a distorted image） was obtained from a vertical original grating pattern by the optical imaging system. Then,the dilating Gabor transform was used to extract the fundamental frequency and phase at the central point of the deformed pattern,where there was no distortion,and the fundamental frequency information was the fundamental frequency component of an ideal image. The deformed grating pattern was analyzed by use of the dilating Gabor transform,and the modulated phase distribution,which was used to calculate the radial distortion distribution,was obtained. Finally,by use of the above radial distortion distribution and bilinearity interpolation,the corrected image was reconstructed. Detailed theoretical analysis is presented and experimental results demonstrate the validity of the above method.

关 键 词： 光学测量 图像畸变 条纹分析 伸缩窗口傅里叶变换

领　　域： [机械工程] [理学] [理学]