二阶广义总变分约束的太阳图像多帧盲解卷积

Multi-frame blind deconvolution of solar images via second-order total generalized variation

盲解卷积是常用的自适应光学图像事后重建方法之一。为提高盲解卷积对太阳(自适应光学)图像的重建效果,本文提出了基于二阶广义总变分的空变多帧盲解卷积算法。该算法首先利用交替最小化和半二次分裂方法求解本文提出的二阶广义总变分约束的空不变多帧盲解卷积模型;然后针对非等晕大视场太阳图像特性,利用重叠分块与加权拼接实现空变盲解卷积扩展。在一米新真空太阳望远镜(NVST)观测的真实太阳图像上进行的重建实验与分析表明,本文算法在主观视觉效果和客观指标上均具有较好的图像重建效果。

Blind deconvolution is one of the commonly used post-reconstruction methods for adaptive optics images.In order to improve the reconstruction performance of blind deconvolution on solar(adaptive optics)images,a space-variant multi-frame blind deconvolution model based on second-order total generalized variation is proposed.It first solves the proposed space-invariant blind deconvolution model via second-order total generalized variation by the alternating minimization and half-quadratic splitting method.Then,according to the characteristics of wide field-of-view solar images which are anisoplanatic,the space-variant in the proposed algorithm is implemented by overlapping image segmentation and weighted stitching.Finally,the reconstruction experiment and analysis are carried out on the real solar images observed by the one-meter New Vacuum Solar Telescope(NVST).The results show that the proposed algorithm has good image reconstruction performance in both subjective visual effects and objective indexes.