基于迭代的傅里叶望远镜图像重构方法  

Image Reconstruction Method of Fourier Telescope Based on Iteration

作　　者：周志盛[1,2] 相里斌[1,2] 张文喜[2] 李杨[2] 

机构地区：[1]中国科学技术大学精密机械及精密仪器系,安徽合肥230027 [2]中国科学院光电研究院,北京100094

出　　处：《光学学报》2014年第5期73-79,共7页Acta Optica Sinica

基　　金：国家高技术研究发展计划(2012AA7031003A);国家杰出青年科学基金(61225024)

摘　　要：为了提高最终图像的质量,结合传统的直接重构算法和相位重构算法,提出了一种基于迭代的傅里叶望远镜图像重构方法。对反演得到的傅里叶频谱进行逆傅里叶变换得到直接重构图像,取直接重构图像的阈值图像作为相位重构算法的初始输入,通过迭代能够获得质量更高的图像。成像仿真实验结果表明,成像信噪比为50倍时,与直接重构图像相比,迭代重构图像斯特列尔比从0.82提高到0.88,峰值信噪比从17dB提高到19dB;在成像信噪比为100倍时,迭代重构图像斯特列尔比从0.89提高到0.93,峰值信噪比从20dB提高到22dB。To improve the quality of the ultimate image, the conventional image reconstruction method and the phase retrieval method are combined and an image reconstruction method of Fourier telescope based on iteration is proposed. A direct reconstructed image is acquired by inverse Fourier transform of the measured Fourier component, and then a threshold image of the direct reconstructed image acts as the initial input for the phase retrieval reconstruction algorithm and a superior image is reconstructed through iteration. Simulation result shows that, compared with direct reconstructed image, the Strehl ratio of reconstructed image from the iterative method raises from 0.83 to 0.88 （50 signal-to-noise ratio） and from 0.89 to 0.93 （100 signal-to-noise ratio）, besides the peak value signal-to-noise raises from 17 dB to 19 dB （50 signal-to-noise ratio） and from 20 dB to 22 dB （100 signal-to- noise ratio）.

关 键 词：成像系统 傅里叶望远镜 图像重构 相位重构 迭代 

分 类 号：TN249[电子电信—物理电子学]