激光与光电子学进展, 2017, 54 (5): 051004, 网络出版: 2017-05-03
用于太阳米粒图像相关的绝对差分算法和绝对差分平方算法的性能比较
Performance Comparison of Absolute Difference Function and Absolute Difference Function-Squared Using in Solar Granulation Images
图像处理 抛物线插值 绝对差分算法 绝对差分平方算法 太阳米粒图像 imaging processing parabolic interpolation absolute difference function absolute difference function-squared solar granulation images
摘要
在太阳自适应光学系统中, 通常需要利用太阳米粒结构等低对比度扩展目标采用相关算法测量波前误差。在对绝对差分算法和绝对差分平方算法在抛物线插值情况下的测量误差进行了理论分析比较的基础上, 利用实际采集的太阳米粒图像对这两种算法进行了实验验证。分析和实验结果表明, 太阳米粒图像绝对差分平方算法所得到的相关函数相比绝对差分算法更符合抛物面分布。采用抛物线插值时, 绝对差分平方算法的测量精度优于绝对差分算法。
Abstract
In solar adaptive optics system, the correlation algorithm is commonly used with low contrast extended objects to measure wave-front error. On the basis of theoretical analysis and comparison of measurement error of absolute difference function and absolute difference function-squared using parabolic interpolation, the solar granulation images collected from real scene are used to validate the two algorithms experimentally. The result indicates that the correlation function of absolute difference function-squared better accords with parabolic distribution than the absolute difference function. The measurement accuracy of absolute difference function-squared is better than absolute difference function when using parabolic interpolation.
周航成, 饶学军, 饶长辉. 用于太阳米粒图像相关的绝对差分算法和绝对差分平方算法的性能比较[J]. 激光与光电子学进展, 2017, 54(5): 051004. Zhou Hangcheng, Rao Xuejun, Rao Changhui. Performance Comparison of Absolute Difference Function and Absolute Difference Function-Squared Using in Solar Granulation Images[J]. Laser & Optoelectronics Progress, 2017, 54(5): 051004.