To determine the fingertip position from hand’s contour
extracted from previous process, hand’s contour a
nalysis is
required. The hand’s contour analysis is done based on
contour’s morphology which is gathered from hand contour
extraction process. Hand’s contour analysis is done by
examining convexity and concavity of the contour. To get the
convex contour from hand’s contour extracted and fingertip
position, cvConvexHull and cvConvexityDefects function is
used in OpenCV. cvConvexHull function is used to generate
convex polygon from extracted hand’s contour. The polygon
will be comprised of vertices in which all nodes comprise of
polygon and vertexes in which lines that connect all vertices.
In next process, the vertices of convex polygon gathered will
be considered as fingertips. Figure 6 depicts hand’s contour
which is processed into a polygon form before the polygon is
processed into convex