关键词: 湍流退化图像, 图像复原, 迭代盲目去卷积, 共轭梯度法, 优化估计

Abstract: The restoration algorithm of iterative blind deconvolution is studied in this paper, an alternant iterative optimized restoration algorithm based on conjugate gradient on frequency domain is proposed. The error cost function of the frequency spectrum of the object image and the PSF in frequency domain is constructed, and the conjugate gradient method is introduced to minimize the error cost function, in which the constrains of the PSF values being non-negative and bandwidth limits are incorporated into the estimation process of the object image and the PSF, resulting in that good restorations are expected and that the abilities of robustness and noise-resisting of the proposed algorithm are enhanced. A series of restoration experiments have been performed on PC, showing that the proposed algorithm can obtained good restoration results and it has high level of noise resisting, and it can recover the object image with complex background.

Key words: Turbulence-degraded image, Image restoration, Iteration blind deconvolution, Conjugate gradient method, Optimized estimation