A Recognition Method of Facility Drawings and Street Maps Utilizing the Facility Management Database

Chikahito NAKAJIMA  Toshihiro YAZAWA  

IEICE TRANSACTIONS on Information and Systems   Vol.E79-D   No.5   pp.555-560
Publication Date: 1996/05/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Character Recognition and Document Understanding)
Category: Document Recognition and Analysis
pattern recognition,  drawing recognition,  map recognition,  discrete relaxation,  energy function,  

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This paper proposes a new approach for inputting handwritten Distribution Facility Drawings (DFD) and their maps into a computer automatically by using the Facility Management Database (FMD). Our recognition method makes use of external information for drawing/map recognition. It identifies each electric-pole symbol and support cable symbol on drawings simply by consulting the FMD. Other symbols such as transformers and electric wires can be placed on drawings automatically. In this positioning of graphic symbols, we present an automatic adjustment method of a symbol's position on the latest digital maps. When a contradiction is unsolved due to an inconsistency between the content of the DFD and the FMD, the system requests a manual feedback from the operator. Furthermore, it uses the distribution network of the DFD to recognize the street lines on the maps which aren't computerized. This can drastically reduce the cost for computerizing drawings and maps.