基于大气相干长度的湍流模糊图像复原  

Atmosphere Turbulence Blurred Image Restoration Based on Atmosphere Coherent Length

作　　者：温昌礼[1,2] 徐蓉[1,2] 门涛[1,2] 刘长海[1,2] 

机构地区：[1]宇航动力学国家重点实验室,陕西西安710043 [2]西安卫星测控中心,陕西西安710043

出　　处：《光学学报》2014年第3期6-13,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61307038)

摘　　要：利用地基光学望远镜观测空间目标时,大气湍流是影响成像质量的主要因素。由于大气湍流引起成像波面的畸变,导致望远镜所获得的图像模糊。为了从模糊图像中复原出目标的原始图像,提出了一种基于大气相干长度的湍流点扩展函数估计方法,进行了理论推导,并利用Sobel方法对迭代相同次数后的盲卷积复原图进行像质评价,找出像质评价结果峰值处对应的大气相干长度;再将此值代入点扩展函数的估计公式中,得到点扩展函数更加准确的估计;然后利用此点扩展函数对湍流模糊图像进行盲卷积图像复原,最后得到目标的复原图像。从多种像质评价结果来看,该方法无需测量大气相干长度,且复原效果较理想。Atmosphere turbulence is one of the main causes of degraded image quality in the area of detecting space objects based on optical telescope on earth. Atmosphere turbulence results in distortion of wavefront, and it causes different kinds of blurred images. In order to recover original images from blurred images, a method to evaluate point spread function based on atmosphere coherent length is proposed, and the theoretical formula is deduced. Sobel method is used to evaluate the image qualities of recovered images after same times of blind convolution, and the value of atmosphere coherent length is found out when the value of image quality is maximal. This atmosphere coherent length is applied to point spread function and the restored image is got after blind convolution. With many kinds of image quality evaluation indices, it is proved that this method can make us get a good restored image without measuring the value of atmosphere coherent length.

关 键 词：大气光学 点扩展函数 大气湍流 大气相干长度 图像复原 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]