自适应光学系统图像的梯度域点扩散函数估计与盲复原方法  

Gradient Domain Point Spread Function Estimation and Blind Restoration of Adaptive Optical System Images

作　　者：徐焕宇 徐萌兮 佘宇 胡立发[3] 宣丽[4] Xu Huanyu;Xu Mengxi;She Yu;Hu Lifa;Xuan Li(School of IOT,Wuxi University,Wuxi 214105,Jiangsu,China;School of Automation,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China;School of Science,Jiangnan University,Wuxi 214122,Jiangsu,China;State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,ChineseAcademy of Sciences,Changchun 130033,Jilin,China)

机构地区：[1]无锡学院物联网工程学院,江苏无锡214105 [2]南京信息工程大学自动化学院,江苏南京210044 [3]江南大学理学院,江苏无锡214122 [4]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033

出　　处：《激光与光电子学进展》2023年第4期41-48,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11704377,11774342,11804336,61805238,61475152)。

摘　　要：地基大口径望远镜观测时会受到大气湍流的影响,分辨能力严重下降。为应对此问题,成像系统中需要配备自适应光学系统以校正波前相差。然而,自适应光学系统仅能实现部分校正,残余波前畸变导致的图像退化需要通过后续图像复原算法恢复。提出了一种针对泊松噪声天文图像的盲复原算法以提高自适应光学系统校正后的图像质量,该算法在图像梯度域中使用自适应L1范数项精确估计点扩散函数,并使用Richardson-Lucy算法与低通去噪声滤波相结合对图像进行复原。在模拟和真实天文图像上的实验结果表明,与其他算法相比,所提算法能够获得更准确的点扩散函数和更真实的复原图像,并且可在不需要额外信息的情况下显著提高自适应光学校正后天文图像的质量。The resolution of a groundbased largescale aperture telescope can be severely deteriorated by atmospheric turbulence.Adaptive optics(AO)systems have been widely used thus far to solve this problem.However,correction using AO is a partial solution.Degraded images generated by residual wavefronts can be restored via postreconstruction.In this paper,a blind deconvolution algorithm to improve the quality of Poisson noise astronomical images acquired after AO correction is proposed.The algorithm uses an adaptive L1 norm term in the gradient domain for an accurate estimation of the point spread function(PSF)as well as the RichardsonLucy algorithm followed by a low pass denoising filter to solve Poisson deconvolution.Experimental results for simulated and real astronomical images demonstrate that the proposed algorithm can obtain better PSF and reconstruction images than other algorithms and significantly improves the quality of postAO astronomical images without further information.

关 键 词：大气光学 自适应光学 图像复原 盲卷积 泊松噪声 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]