Homotopy in digital spaces ?
The main contribution of this paper is a new extrinsic digital fundamental group that can be readily generalized to define higher homotopy groups for arbitrary digital spaces. We show that the digital fundamental group of a digital object is naturally isomorphic to the fundamental group of its continuous analogue. In addition, we state a digital version of the SeifertVan Kampen theorem.
digital fundamental group seifertvan kampen theorem digital homotopy lighting functions