Electric Power Utilities have several hundred thousands of power distribution facility management maps, each set consisting of topographic map and line map, for management of power transmition and distribution facilities. The power distribution facility management maps are now drawn and updated by hand, so it has been taken huge time to maintain these maps. Then, we developed the automatic input and recognition system for power distribution facility management maps to store the digital mapping data in computer databasse. In this paper, we describe this system and recognition technique.
In this system, power distribution facility management maps, inputted by automatic drawing reader as image data and transfered to vector data by image processor, are recognized at figure elements with logical recognition method (using conditional value calculation technique to separate the figure elements like symbols and road, house shapes). But this logical recognition method cannot exactly recognize complicated parts of maps included overlapped symbols and partially omitted figures, so we adapt additional ratiocinative recognition method using knowledge-base for complicated parts of maps.
We can input and recognize power distribution facility management maps automatically and get high recognition rate by this system.
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