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关于渐近不相干及其对逆问题压缩感知的影响

On Asymptotic Incoherence and its Implications for Compressed Sensing of Inverse Problems

University of Cambridge(剑桥大学);Simon Fraser University(西蒙菲莎大学);University of Oslo(奥斯陆大学)

Alex D. Jones, Ben Adcock, Anders C. Hansen

AI总结:

本文研究了渐近不相干及其对最优采样策略和高效稀疏基设计的影响,探讨了傅里叶采样和小波稀疏性在渐近不相干中的最优衰减特性。

摘要:

最近研究表明,在许多逆问题中,不相干性假设对于压缩感知来说是不现实的。相反,允许此类问题高效恢复的关键属性是所谓的局部不相干性。同样,标准稀疏性概念在许多现实问题中也不足。特别是,在许多应用中,最优采样策略取决于渐近不相干性和信号稀疏结构。本文旨在研究渐近不相干及其对最优采样策略和高效稀疏基设计的影响。确定了在一般等距映射中渐近不相干可以多快衰减。此外还显示,尽管傅里叶采样和小波稀疏性在全局上是相干的,但它们在渐近不相干上以幂律形式(至常数因子)达到最优。还提供了傅里叶采样与多项式基的渐近不相干的精确界。此外还展示了渐近不相干在寻找良好子采样策略中的作用的数值实验。

英文摘要:

Recently, it has been shown that incoherence is an unrealistic assumption for compressed sensing when applied to many inverse problems. Instead, the key property that permits efficient recovery in such problems is so-called local incoherence. Similarly, the standard notion of sparsity is also inadequate for many real world problems. In particular, in many applications, the optimal sampling strategy depends on asymptotic incoherence and the signal sparsity structure. The purpose of this paper is to study asymptotic incoherence and its implications towards the design of optimal sampling strategies and efficient sparsity bases. It is determined how fast asymptotic incoherence can decay in general for isometries. Furthermore it is shown that Fourier sampling and wavelet sparsity, whilst globally coherent, yield optimal asymptotic incoherence as a power law up to a constant factor. Sharp bounds on the asymptotic incoherence for Fourier sampling with polynomial bases are also provided. A numerical experiment is also presented to demonstrate the role of asymptotic incoherence in finding good subsampling strategies.

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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