By Simon Foucart
At the intersection of arithmetic, engineering, and desktop technological know-how sits the thriving box of compressive sensing. in keeping with the idea that information acquisition and compression could be played at the same time, compressive sensing reveals purposes in imaging, sign processing, and plenty of different domain names. within the components of utilized arithmetic, electric engineering, and theoretical computing device technology, an explosion of analysis task has already the theoretical effects that highlighted the potency of the fundamental ideas. The based rules at the back of those ideas also are of self sufficient curiosity to natural mathematicians.
A Mathematical advent to Compressive Sensing offers an in depth account of the middle thought upon which the sector is construct. With in simple terms reasonable must haves, it really is a good textbook for graduate classes in arithmetic, engineering, and laptop technology. It additionally serves as a competent source for practitioners and researchers in those disciplines who are looking to collect a cautious realizing of the topic. A Mathematical creation to Compressive Sensing makes use of a mathematical standpoint to give the middle of the speculation underlying compressive sensing.
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Extra resources for A Mathematical Introduction to Compressive Sensing
Then we form y ˆ = Aˆ known signal y x as the denoised version of y. 4) which takes noise into account, or the so-called basis pursuit denoising problem minimize λ z 1 + Az − y 22 . • Data Separation. Suppose that a vector y ∈ Cm is the composition of two (or more) components, say y = y1 + y2 . Given y, we wish to extract the unknown vectors y1 , y2 ∈ Cm . This problem appears in several signal processing tasks. For instance, astronomers would like to separate point structures (stars, galaxy clusters) from filaments in their images.
In contrast to the vector case, there is remarkably no logarithmic factor involved. As a popular special case, the matrix completion problem seeks to fill in missing entries of a low-rank matrix. Thus, the measurement map A samples the entries A(X) = Xj,k for some indices j, k depending on . This setup appears, for example, in consumer taste prediction. Assume that an (online) store sells products indexed by the rows of the matrix and consumers—indexed by the columns—are able to rate these products.
The null space property is not easily verifiable by a direct computation. The coherence, introduced in Chap. 5, is a much simpler concept to assess the quality of a measurement matrix. For A ∈ Cm×N with 2 -normalized columns a1 , . . , aN , it is defined as μ := max | aj , ak |. j=k We also introduce the 1 -coherence function μ1 as a slight refinement of the coherence. Ideally, the coherence μ of a measurement matrix should be small. A fundamental lower bound on μ (a related bound on μ1 holds, too) is μ≥ N −m .