Features from a Single Vector Pressure Stroke

Table 3

Coordinate features.

Number	Feature	Definition	Formula and value
1		Horizontal container of object	,
2		General box container	, , ,
3		Center of
			4		Centroid of convex
5		Arc center of 2 segments
			6		Centroid of stroke		,
			7		Min. container of
						8		Cross point of two segments when Segment 1 is vertical and Segment 2 is not vertical		,
			Cross point of two segments when Segment 2 is vertical and Segment 1 is not vertical		,
				Cross point of two segments when they are collinear
Cross point of two segments in any other cases
	9		Knee point
10		Inflection
11	,	Axial knee point	,
			12		Convex hull of stroke