arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.06307cs.CV
收藏

非平稳噪声的多核滤波:基于图像上下文的双边滤波的扩展

Multi-Kernel Filtering for Nonstationary Noise: An Extension of Bilateral Filtering Using Image Context

Northwest University(西北大学);University of North Carolina at Chapel Hill(北卡罗来纳大学教堂山分校);Korea University(高丽大学)

Feihong Liu, Jun Feng, Pew-Thian Yap, Dinggang Shen

摘要:

双边滤波(BF)是最经典的去噪滤波器之一,然而,手动初始化的滤波核阻碍了它对具有不同特征的图像的自适应性。为了处理图像变化(即,非平稳噪声),本文提出了一种多核滤波器(MKF),该滤波器能够自动地根据图像的特定特征调整滤波核。MKF的设计灵感来自人类视觉的自适应机制,充分利用视觉环境中的信息。更具体地说,为了模拟视觉上下文及其自适应功能,我们构建了图像上下文,在此基础上,我们模拟了上下文对过滤内核的影响。我们首先设计了一个层次聚类算法,生成一个由大到小的相干图像块组成的层次,组织成一个聚类树,从而获得多尺度的图像表示。叶簇和对应的前驱簇用于生成能够迎合图像变化的多个范围核中的一个。首先,我们设计了一个层次聚类框架,生成一个由大到小的相干图像块组成的层次聚类树,从而获得多尺度的图像表示,即,图像上下文。接下来,使用叶簇来生成多个内核中的一个,并且使用两个对应的前驱簇来微调所采用的内核。最终,BF中的单个空间不变核变为多个空间变化核。我们在两个公共数据集BSD300和BrainWeb上评估了MKF,这两个数据集分别添加了积分变化噪声和空间变化噪声。大量的实验表明,MKF优于最先进的过滤器w.r.t.都意味着绝对误差和结构相似性。

英文摘要:

Bilateral filtering (BF) is one of the most classical denoising filters, however, the manually initialized filtering kernel hampers its adaptivity across images with various characteristics. To deal with image variation (i.e., non-stationary noise), in this paper, we propose multi-kernel filter (MKF) which adapts filtering kernels to specific image characteristics automatically. The design of MKF takes inspiration from adaptive mechanisms of human vision that make full use of information in a visual context. More specifically, for simulating the visual context and its adaptive function, we construct the image context based on which we simulate the contextual impact on filtering kernels. We first design a hierarchically clustering algorithm to generate a hierarchy of large to small coherent image patches, organized as a cluster tree, so that obtain multi-scale image representation. The leaf cluster and corresponding predecessor clusters are used to generate one of multiple range kernels that are capable of catering to image variation. At first, we design a hierarchically clustering framework to generate a hierarchy of large to small coherent image patches that organized as a cluster tree, so that obtain multi-scale image representation, i.e., the image context. Next, a leaf cluster is used to generate one of the multiple kernels, and two corresponding predecessor clusters are used to fine-tune the adopted kernel. Ultimately, the single spatially-invariant kernel in BF becomes multiple spatially-varying ones. We evaluate MKF on two public datasets, BSD300 and BrainWeb which are added integrally-varying noise and spatially-varying noise, respectively. Extensive experiments show that MKF outperforms state-of-the-art filters w.r.t. both mean absolute error and structural similarity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑