An Approach to the Computation of the Euler Number by means of the Vertex Chain Code

Figure 6

Proof of Theorem 13: (a) a binary shape with one hole; (b–e) the shape shown in (a) with two holes (b), with three holes (c), with four holes (d), and with five holes (e), respectively.

(a)

(b)

(c)

(d)

(e)