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Communication Dans Un Congrès Année : 2020

Approximating general kernels by extended fuzzy measures: application to filtering

Résumé

Convolution kernels are essential tools in signal processing: they are used to filter noisy signal, interpolate discrete signals,. .. . However, in a given application, it is often hard to select an optimal shape of the kernel. This is why, in practice, it may be useful to possess efficient tools to perform a robustness analysis, talking the form in our case of an imprecise convolution. When convo-lution kernels are positive, their formal equivalence with probability distributions allows one to use imprecise probability theory to achieve such an imprecise con-volution. However, many kernels can have negative values, in which case the previous equivalence does not hold anymore. Yet, we show mathematically in this paper that, while the formal equivalence is lost, the computational tools used to describe sets of probabilities by intervals on the singletons still retain their key properties when used to approximate sets of (possibly) non-positive kernels. We then illustrate their use on a single application that consists of filtering a human electrocardiogram signal by using a low-pass filter whose order is imprecisely known. We show, in this experiment, that the proposed approach leads to tighter bounds than previously proposed approaches.
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Dates et versions

hal-02944849 , version 1 (21-09-2020)

Identifiants

Citer

Sébastien Destercke, Agnès Rico, Olivier Strauss. Approximating general kernels by extended fuzzy measures: application to filtering. IPMU 2020 - 18th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems, Jun 2020, Lisboa, Portugal. pp.112-123, ⟨10.1007/978-3-030-50143-3_9⟩. ⟨hal-02944849⟩
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