Vessel Tortuousity Detection
Curvature based on Paths
Curvature of a point t, K(t) on a line based on the x and y co-ordinates of the point t, and the x and y co-ordinates of a point 5 pixels ahead
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where (x0(t), y0(t)) is the coordinates at point t, and (x0(t), y0(t)) is the coordinates 5 pixels ahead of t.