一种改进的离焦模型

针对常用的圆盘模型和高斯模型修复离焦图像时不能用于自动图像处理的问题，提出一种改进的离焦模型。该模型根据离焦图像的圆对称性，估算离焦的点扩散函数及其参数，以其描述离焦现象。基于该离焦模型实现了一种离焦模糊图像复原算法。实验结果表明，与采用圆盘模型和高斯模型的离焦模糊图像复原算法相比，该模型的图像复原结果更优。

An enhanced defocusing model

This paper follows from the need for an alternative to the commonly used defocusing model （circle model and Gaussian model） which fails to find application in auto processes of defocused image restoration. The novel enhanced refocusing model works on the circular symmetry of the defocused image by which to estimate the point spreading function and thus describe the way defocus occurs, and leads to a refocused image restoration algorithm. The experiments prove that the algorithm produces better image restoration than the algorithm of circle model and Gaussian model.