论文标题
图像使用稀疏的变换学习和加权奇异值最小化的图像denoing
Image Denoising Using Sparsifying Transform Learning and Weighted Singular Values Minimization
论文作者
论文摘要
在图像DeNoising(IDN)处理中,低级别的属性通常被视为重要的图像。作为低级凸的松弛近似,基于核标准的算法及其变体引起了极大的关注。这些算法可以集体称为基于图像域的方法,其共同缺点是对一些可接受的解决方案进行大量迭代的要求。同时,在图像降解问题中也利用了特定变换域中图像的稀疏性。稀疏转换学习算法可以实现极快的计算以及理想的性能。通过将图像域的优势和转换域在一般框架中进行转换,我们提出了稀疏性转换学习和加权奇异值最小化方法(STLWSM),以解决IDN问题。提出的方法可以充分利用两个域的优势。为了解决非凸成本函数,我们还提出了加速的有效替代解决方案。实验结果表明,所提出的STLWSM在视觉和定量上都取得了改进,而基于替代单个域的最新方法比最新方法的差距很大。与所有图像域算法相比,它也需要少得多的迭代。
In image denoising (IDN) processing, the low-rank property is usually considered as an important image prior. As a convex relaxation approximation of low rank, nuclear norm based algorithms and their variants have attracted significant attention. These algorithms can be collectively called image domain based methods, whose common drawback is the requirement of great number of iterations for some acceptable solution. Meanwhile, the sparsity of images in a certain transform domain has also been exploited in image denoising problems. Sparsity transform learning algorithms can achieve extremely fast computations as well as desirable performance. By taking both advantages of image domain and transform domain in a general framework, we propose a sparsity transform learning and weighted singular values minimization method (STLWSM) for IDN problems. The proposed method can make full use of the preponderance of both domains. For solving the non-convex cost function, we also present an efficient alternative solution for acceleration. Experimental results show that the proposed STLWSM achieves improvement both visually and quantitatively with a large margin over state-of-the-art approaches based on an alternatively single domain. It also needs much less iteration than all the image domain algorithms.