摘要
为了使夏克-哈特曼波前传感器(SHWFS)能保证精度的同时又能获得更大的动态范围,介绍了一种用于SHWFS的自动子孔径搜索与匹配算法。该方法在实施时,先根据待测量图像计算背景阈值,然后以减阈值后的图像中心位置的一个光斑为参考光斑的参考中心,按图像的横、纵方向依次搜索其它光斑点,接着将搜索的结果拼接起来得到所有孔径的分布,最后根据两幅图像得到的各自的子孔径分布按横、纵方向平移进行配准,以达到最优的匹配结果。文中利用实验对本论文提出的方法进行了验证。结果表明,本文提出的方法能够实现SHWFS的子孔径搜索与匹配,提高哈特曼的动态范围。
An automatic method of searching and matching sub-aperture for Shack-Hartmann Wavefront Sensor （SHWFS） is introduced to enlarge the dynamic range of SHWFS while maintaining its designed accuracy. Firstly, the threshold of the image is estimated. By taking a spot of near the center of the thresholded image as the reference center, other spots are searched horizontally and vertically and combined to retrieve the whole sub-aperture distribution. Finally, the sub-aperture distributions of two images are matched by shifting horizontally and vertically. The proposed method is verified experimentally. The result shows that this method can realize the automatic searching and matching of the sub-aperture of SHWFS and enlarge the dynamic range of SHWFS.
出处
《光电工程》
CAS
CSCD
北大核心
2012年第2期31-35,共5页
Opto-Electronic Engineering
