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Feature extraction.pptx

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Data Features Domain Type Dimensions Reference Time 3 (Sun et al. 2010) (Bao & Data Features Domain Type Dimensions Reference Time 3 (Sun et al. 2010) (Bao & Intille 2004) Time 3 (Godfrey et al. 2008) Time 3 (Ermes et al. 2008) Time 3 (Bao & Intille 2004) Time 3 (Mase 2002) (Altini et al. 2012) Average Resultant Acceleration Time 1 (Kwapisz et al. 2011) Magnitude Average Absolute Difference Time 1 (Khan et al. 2010) Time 3 (Kwapisz et al. 2011) Average Absolute Value Time 3 (Kwapisz 2010) Time 3 (Staudenmayer et al. 2009) Time Dominant frequency Frequency 3 (Sun et al. 2010) Energy Frequency 3 (Bao & Intille 2004) 3 (Mannini & Sabatini Factor Equation Mean Variance Skewness Kurtosis Covariance Zero Crossing Rate Mean Crossing Rate Root Mean Square FFT Transformation Entropy N/A Frequency 1

Example • 1 3 5 -3 1 -1 4 1 -5 2 Example • 1 3 5 -3 1 -1 4 1 -5 2

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 3 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 3

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 4 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 4

Example cont’d • 5 Example cont’d • 5

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 6 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 6

Example cont’d • 7 Example cont’d • 7

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 8 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 8

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 Cross Zero Example cont’d • 1 3 5 -3 1 -1 4 1 -5 Cross Zero 9

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 Cross Mean Example cont’d • 1 3 5 -3 1 -1 4 1 -5 Cross Mean 10

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 11 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 11

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 12 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 12

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 13 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 13

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 14 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 14

Example cont’d • 1 3 5 -3 1 -1 4 1 -5 15 Example cont’d • 1 3 5 -3 1 -1 4 1 -5 15

Factor 1 or 3 – dimension Result Mean Variance Skewness Kurtosis Covariance ZCR MCR Factor 1 or 3 – dimension Result Mean Variance Skewness Kurtosis Covariance ZCR MCR ARA 5. 18 Magnitude AAD AAV RMS 1 3 5 -3 1 -1 4 1 -5 16