摘要
研究了光学系统实时精密自动对准中光束光瞳位置动态变化的测量问题。采用相位相关算法处理基准和实测图像得到光瞳平移量数据,其测量相对误差不超过0.4pixel;针对实际运用中光瞳图像存在的灰度变化、噪声、旋转和缩放等诸影响因素,对算法进行了理论分析和全面的仿真测试。结果表明该算法能克服光强分布不均和强噪声的影响,得到高精度测量结果;对旋转和缩放进行校正后,测量精度在1pixel左右。提出并测试了将多帧图像叠加后的图像之和作为基准图像的测量方法,使相位相关信噪比提高了88.6%,稳健性显著提高。
The measurement of pupil-positoin change in real-time precise automatic alignment of optical system is investigated. The translation data of the pupil is obtained by processing reference of phase-correlation algorithm and experimentally measured image; the measurement relative error is less than 0. 4 pixel. In accordance with the various influencing factors such as the grey level change, noise, rotation and sealing, theoretical analysis and simulation test of the algorithm is performed. The results show that algorithm can overcome effect of inhomo-geneous distrbution of light intensity and severe noise, so that high measurement result can be obtained. After correction of the rotation and scaling corrected, the measurement precision remains in 1 pixel. The measurement method that superposed multi-image sum is taken as the reference image is proposed, the phase correlation SNR is enhanced by 88.6 %, robutness is obviously increased.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第5期125-130,共6页
Laser & Optoelectronics Progress
关键词
测量
光路准直
相位相关法
光瞳平移量
measurement
optical collimation
phase correlation
pupil displacement
