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arXiv 1704.01992cs.ITmath.IT
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一种基于压缩的压缩感知算法

An efficient algorithm for compression-based compressed sensing

Sajjad Beygi, Shirin Jalali, Arian Maleki, Urbashi Mitra

摘要:

现代图像和视频压缩码采用存在于这种信号中的精细结构来将它们编码成少量比特。另一方面,压缩感知恢复算法使用这样的信号的结构来从很少的线性观测中恢复它们。尽管压缩感知领域取得了稳步进展,但通常用于信号恢复的结构仍然比最先进的压缩编码所采用的结构简单得多。本文的主要目标是弥合这一差距,通过回答以下问题:可以采用一个给定的压缩代码,建立一个有效的(多项式时间)压缩感知恢复算法?针对这一问题,提出了基于压缩的梯度下降(C-GD)算法。C-GD是一种低复杂度的迭代算法,能够采用通用压缩码进行压缩感知,因此将压缩感知中使用的结构的范围提升到压缩码所使用的范围。从理论上分析了C-GD算法的收敛性能和所需的测量次数对压缩码率失真性能的影响。同时也证明了C-GD算法对加性高斯白噪声的鲁棒性。最后,所提出的仿真结果表明,结合C-GD与商业图像压缩编码,如JPEG 2000产生国家的最先进的性能在成像应用。

英文摘要:

Modern image and video compression codes employ elaborate structures existing in such signals to encode them into few number of bits. Compressed sensing recovery algorithms on the other hand use such signals' structures to recover them from few linear observations. Despite the steady progress in the field of compressed sensing, structures that are often used for signal recovery are still much simpler than those employed by state-of-the-art compression codes. The main goal of this paper is to bridge this gap through answering the following question: Can one employ a given compression code to build an efficient (polynomial time) compressed sensing recovery algorithm? In response to this question, the compression-based gradient descent (C-GD) algorithm is proposed. C-GD, which is a low-complexity iterative algorithm, is able to employ a generic compression code for compressed sensing and therefore elevates the scope of structures used in compressed sensing to those used by compression codes. The convergence performance of C-GD and its required number of measurements in terms of the rate-distortion performance of the compression code are theoretically analyzed. It is also shown that C-GD is robust to additive white Gaussian noise. Finally, the presented simulation results show that combining C-GD with commercial image compression codes such as JPEG2000 yields state-of-the-art performance in imaging applications.

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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