Active learning versus compressive sampling

Rui Castro; Jarvis Haupt; Robert Nowak

doi:10.1117/12.669725

4 May 2006 Active learning versus compressive sampling

Rui Castro, Jarvis Haupt, Robert Nowak

Proceedings Volume 6232, Intelligent Integrated Microsystems; 623208 (2006) https://doi.org/10.1117/12.669725
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Compressive sampling (CS), or Compressed Sensing, has generated a tremendous amount of excitement in the signal processing community. Compressive sampling, which involves non-traditional samples in the form of randomized projections, can capture most of the salient information in a signal with a relatively small number of samples, often far fewer samples than required using traditional sampling schemes. Adaptive sampling (AS), also called Active Learning, uses information gleaned from previous observations (e.g., feedback) to focus the sampling process. Theoretical and experimental results have shown that adaptive sampling can dramatically outperform conventional (non-adaptive) sampling schemes. This paper compares the theoretical performance of compressive and adaptive sampling for regression in noisy conditions, and it is shown that for certain classes of piecewise constant signals and high SNR regimes both CS and AS are near optimal. This result is remarkable since it is the first evidence that shows that compressive sampling, which is non-adaptive, cannot be significantly outperformed by any other method (including adaptive sampling procedures), even in the presence of noise. The performance of CS schemes for signal detection is also investigated.

Citation Download Citation

Rui Castro, Jarvis Haupt, and Robert Nowak "Active learning versus compressive sampling", Proc. SPIE 6232, Intelligent Integrated Microsystems, 623208 (4 May 2006); https://doi.org/10.1117/12.669725

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