Smart-Sleeve: A Wearable Textile Pressure Sensor Array for Human Activity Recognition

. 2022 Feb 22;22(5):1702. doi: 10.3390/s22051702


$F e a t_{9}$ , $F e a t_{10}$ :	The centroid coordinate x and y.
$F e a t_{11}$ , $F e a t_{12}$ :	The centre of mass coordinate x and y.
$F e a t_{13}$ :	The distance from the centroid to the origin.
$F e a t_{14}$ :	The distance from the centre of mass to the origin.
$F e a t_{15}$ :	The angle between the line from the origin to the centroid and the positive direction of the x-axis.
$F e a t_{16}$ :	The angle between the line from the origin to the centre of mass and the positive direction of the x-axis.
$F e a t_{17}$ to $F e a t_{20}$ :	Width, height, aspect ratio, and area of the bounding rectangle of the pressure image.
$F e a t_{21}$ :	Area (the number of pixels after thresholding with a value of 2).
$F e a t_{22}$ to $F e a t_{28}$ :	Hu’s seven invariant moments [37], which are rotation, translation, and scale invariant.
$F e a t_{29}$ :	Coverage (proportion of image covered).
$F e a t_{30}$ to $F e a t_{32}$ :	The coverage for the pixels that contain 25%, 50%, and 75% of the total pressure.
$F e a t_{33}$ to $F e a t_{36}$ :	The coverage over four fixed rectangular regions.
$F e a t_{37}$ :	The number of contours.
$F e a t_{38}$ :	Area of the contour containing the largest area.
$F e a t_{39}$ :	Pressure of the contour containing the largest pressure.
$F e a t_{40}$ :	Intensity of pressure of the contour containing the largest intensity of pressure.
$F e a t_{41}$ to $F e a t_{52}$ :	$F e a t_{9}$ to $F e a t_{20}$ of the masked image.