光电工程, 2009, 36 (8): 105, 网络出版: 2009-10-09
模糊核估计不准确下的振铃效应修正
Reducing Impact of the Ring Artifacts under the Condition of the Inaccurate Blurring Kernel
摘要
在图像恢复过程中,总会引入一定程度的振铃效应,严重的影响了图像恢复的质量。本文分析了图像的梯度分布直方图,通过分析它们在图像处理过程中的变化,论述了将自然图像梯度分布添加到图像恢复中的必要性。采用参数替代算法处理添加约束后的图像恢复表达式,使得恢复过程简单迅速。本文分别采用模拟图像和实拍图像论证了该算法,从恢复的两组图像中看到,不管是针对模拟图像还是实拍图像,该算法对图像中的振铃效应的消除作用都是比较明显的,恢复后得到的梯度分布图也相较于RL 算法的恢复图更接近原图的梯度分布图。即该算法即使在模糊核估计不准确的情况下,也能得到比较好的恢复图像。
Abstract
During the process of deblurring image, the ring artifacts are inevitable, which seriously affects the definition of the deblurred image. If the blurring kernel is inaccurate, the ring artifacts will be more serious. By analyzing the gradient distribution histogram of the images during the deblurring process, we demonstrated the necessity of adding the nature image gradient constraint to the image restoration. A variable substitution scheme was established to simplify the computation. According to the calculated data, the impact of ring artifacts is not serious in the synthetic image or the real motion blur image by this approach. And the image gradient distribution of calculation result was closer to the latent image than the RL. Moreover, we cloud get a good result even if the motion deblurring kernel was inaccurate.
王永攀, 冯华君, 徐之海, 李奇, 雷华, 郑珍珍. 模糊核估计不准确下的振铃效应修正[J]. 光电工程, 2009, 36(8): 105. WANG Yong-pan, FENG Hua-jun, XU Zhi-hai, LI Qi, LEI Hua, ZHENG Zhen-zhen. Reducing Impact of the Ring Artifacts under the Condition of the Inaccurate Blurring Kernel[J]. Opto-Electronic Engineering, 2009, 36(8): 105.