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Fuzzy entropy (FuzzyEn), a new measure of time series regularity, was proposed and applied to the characterization of surface electromyography (EMG) signals. Similar to the two existing related measures ApEn and SampEn, FuzzyEn is the negative natural logarithm of the conditional probability that two vectors similar for m points remain similar for the next(More)
This paper compares three related measures of complexity, ApEn, SampEn, and FuzzyEn. Since vectors' similarity is defined on the basis of the hard and sensitive boundary of Heaviside function in ApEn and SampEn, the two families of statistics show high sensitivity to the parameter selection and may be invalid in case of small parameter. Importing the(More)
Eigenface (PCA) and Fisherface (LDA) are two of the most commonly used subspace techniques in the area of face recognition. PCA maximizes not only intersubject variation but also the intrasubject variation without considering the class label even if they are available. LDA is prone to overfitting when the training data set is small, which wildly exists in(More)
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