A development of the automatic digitizing system for power distribution facility images

In this paper, we propose a recognition technique of electric poles and wires which are drawn on a power distribution facility map. The map represents power supply facilities from substation to consumer. Proposed technique is based on circularity and connectivity, and consists of four phases. At first, we extract a power distribution facility area from input image using threshold value obtained by histogram analysis. Secondly, a thinned image is obtained by applying a thinning operator. At the third step, we extract candidate poles based on circularity which is measured in the search area around the branch points of thinned image. Finally, after electric wires between two branch points is recognized based on connectivity, candidate poles with at least a wire are confirmed to electric poles. The experimental study is performed on randomly sampled 30 power distribution facility map.