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Automatic Threshold Determination for a Local Approach of Change Detection in Long-Term Signal Recordings

EURASIP Journal on Advances in Signal Processing volume 2007, Article number: 024748 (2007) Cite this article

Abstract

CUSUM (cumulative sum) is a well-known method that can be used to detect changes in a signal when the parameters of this signal are known. This paper presents an adaptation of the CUSUM-based change detection algorithms to long-term signal recordings where the various hypotheses contained in the signal are unknown. The starting point of the work was the dynamic cumulative sum (DCS) algorithm, previously developed for application to long-term electromyography (EMG) recordings. DCS has been improved in two ways. The first was a new procedure to estimate the distribution parameters to ensure the respect of the detectability property. The second was the definition of two separate, automatically determined thresholds. One of them (lower threshold) acted to stop the estimation process, the other one (upper threshold) was applied to the detection function. The automatic determination of the thresholds was based on the Kullback-Leibler distance which gives information about the distance between the detected segments (events). Tests on simulated data demonstrated the efficiency of these improvements of the DCS algorithm.

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Authors and Affiliations

  1. Institut des Sciences et Technologies de l'Information, Université de Technologie de Troyes, France

    Wassim El Falou, Jacques Duchêne & David Hewson

  2. Faculté de Génie I, Université Libanaise, Tripoli, Lebanon

    Wassim El Falou & Mohamad Khalil

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  1. Wassim El Falou
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  2. Mohamad Khalil
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  3. Jacques Duchêne
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  4. David Hewson
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Correspondence to Wassim El Falou.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://doi.org/creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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El Falou, W., Khalil, M., Duchêne, J. et al. Automatic Threshold Determination for a Local Approach of Change Detection in Long-Term Signal Recordings. EURASIP J. Adv. Signal Process. 2007, 024748 (2007). https://doi.org/10.1155/2007/24748

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