基于空间约束高斯混合模型的EPLL自然图像复原

EPLL based natural image restoration using spatially constrained Gaussian mixture model

为了提高基于块先验的自然图像复原效果,有效去除图像中的噪声和模糊,提出了一种基于空间约束高斯混合模型的块似然对数期望(Expected patch log likelihood,EPLL)复原框架。基于图像块的空间分布信息,将图像块的空间约束高斯混合统计特性作为先验,在图像块复原的基础上实现整幅图像的全局优化复原。对比相关的图像复原方法,提出的方法去噪和去模糊效果更好,并且保留图像细节。利用客观性能指标对复原结果进行评价。实验结果表明,提出的方法有效易行,而且复原图像表现出良好的可视效果。

In order to improve the performance of patch prior based natural image restoration,and effectively remove the noise and blur of images,a restoration framework of expected patch log likelihood（EPLL）using spatially constrained Gaussian mixture model was presented.Based on the spatial distribution information of patches,the priors were defined using the spatially constrained Gaussian mixture statistical characteristics.Image restoration was realized based on the global optimization of image patch restoration.Compared with related works,the proposed method performed better in image denoising and deblurring,and preserved details.The performance of the restoration results was evaluated by the objective indicator.The experimental results show that the proposed method is effective and the visual effect of the image restoration is pleased.