30 August 2005 Non-linear algorithms for noise removal from medical signals using the logical transform
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Abstract
During critical situations, the precise digital processing of medical signals such as heartbeats is essential. Outside noise introduced into this data can lead to misinterpretation. Thus, it is important to be able to detect and correct the signal quickly and efficiently using digital filtering algorithms. With filtering, the goal is to remove noise locations by correctly identify the corrupted data points and replacing these locations with acceptable estimations of the original values. However, one has to be careful throughout the filtering process not to also eliminate other important detailed information from the original signal. If the filtered output is to be analyzed post-filtering, say for feature recognition, it is important that both the structure and details of the original clean signal remain. This paper presents an original algorithm and two variations, all using the logical transform, that strive to do this accurately and with low levels of computation. Using real heartbeat signals as test sets, the output is compared to that produced by median type filters, and results demonstrated over a variety of noise levels.
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Ethan E. Danahy, Ethan E. Danahy, Sos S. Agaian, Sos S. Agaian, Karen A. Panetta, Karen A. Panetta, } "Non-linear algorithms for noise removal from medical signals using the logical transform", Proc. SPIE 5916, Mathematical Methods in Pattern and Image Analysis, 591603 (30 August 2005); doi: 10.1117/12.617153; https://doi.org/10.1117/12.617153
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