arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1009.4359math.FA
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紧凑支撑Shearlets

Compactly Supported Shearlets

Gitta Kutyniok, Jakob Lemvig, Wang-Q Lim

摘要:

剪切波理论已成为分析和表示具有各向异性特征的2D数据的核心工具。Shearlet系统是由一个单一的生成器生成的函数系统,其中应用了抛物线缩放,剪切和平移算子,小波系统是单一函数的二进缩放和平移,但包括精确的方向性控制。在过去十年中提出的许多方向表示系统中,shearlet是最通用和最成功的系统之一。这是一个广泛的列表的理想属性的原因:剪切波系统可以由一个函数生成,它们提供波前集的精确分辨率,它们允许compensable支持的分析元素,它们与快速分解算法相关联,并且它们提供了统一的处理连续和数字领域。本文的目的是介绍一些关键的概念,在方向表示系统和shearlet系统作为方向表示系统的成功阐明。特别是,我们将概述剪切波理论中采取的不同路径,重点是2D和3D中的可分离和可压缩剪切波。我们将提出在这些方面的companies支持的剪切波框架的建设,以及讨论最近的结果companies支持的剪切波框架的能力,满足弱衰减,平滑度和方向矩条件,以提供最佳稀疏近似的卡通图像在2D和3D。最后,我们将证明,这些composite支持的剪切波系统提供最佳稀疏近似的一个甚至广义模型的卡通图像组成的$C^2$功能,是光滑的,除了分段$C^2$不连续的边缘。

英文摘要:

Shearlet theory has become a central tool in analyzing and representing 2D data with anisotropic features. Shearlet systems are systems of functions generated by one single generator with parabolic scaling, shearing, and translation operators applied to it, in much the same way wavelet systems are dyadic scalings and translations of a single function, but including a precise control of directionality. Of the many directional representation systems proposed in the last decade, shearlets are among the most versatile and successful systems. The reason for this being an extensive list of desirable properties: shearlet systems can be generated by one function, they provide precise resolution of wavefront sets, they allow compactly supported analyzing elements, they are associated with fast decomposition algorithms, and they provide a unified treatment of the continuum and the digital realm. The aim of this paper is to introduce some key concepts in directional representation systems and to shed some light on the success of shearlet systems as directional representation systems. In particular, we will give an overview of the different paths taken in shearlet theory with focus on separable and compactly supported shearlets in 2D and 3D. We will present constructions of compactly supported shearlet frames in those dimensions as well as discuss recent results on the ability of compactly supported shearlet frames satisfying weak decay, smoothness, and directional moment conditions to provide optimally sparse approximations of cartoon-like images in 2D as well as in 3D. Finally, we will show that these compactly supported shearlet systems provide optimally sparse approximations of an even generalized model of cartoon-like images comprising of $C^2$ functions that are smooth apart from piecewise $C^2$ discontinuity edges.

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。

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