摘要
针对畸变图像提出一种校正方法。以朗奇光栅作为标定模板,通过图像传感器获得畸变条纹图像,并用从畸变图像的中心无畸变区域提取的相干载波,对畸变图像进行正交相干解调,得到畸变图像的相位分布;将相位分布转化为像素坐标畸变量,以得到畸变图像和校正图像的坐标空间映射关系;用双线性插值算法进行图像灰度级重建,从而实现对几何畸变图像的校正。实验结果表明所提方法有效可行。
In order to correct a distorted image, the Ronchi grating is used as calibration template in this paper. First, the distorted grating fringe image is captured by image sensor. By demodula- ting the image with the coherent carrier which extracted from the central region, the phase distri- bution is obtained. Then the phase distribution is converted to distortion of pixel coordinates. The coordinate space mapping relationship between distorted image and corrected image is built. At last, by reconstructing the grayscale with bi-linear interpolation algorithm, the corrected im- age is obtained. The experiment results show that this method is feasible.
出处
《西安邮电学院学报》
2013年第3期100-103,共4页
Journal of Xi'an Institute of Posts and Telecommunications
关键词
图像处理
畸变校正
相位检测
载频条纹
image processing, distortion correction, phase detection, carrier-fringe
