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An automatic circuit diagram reader with loop-structure-based symbol recognition

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5 Author(s)
Okazaki, A. ; Toshiba Res. & Dev. Center, Kawasaki, Japan ; Kondo, T. ; Mori, K. ; Tsunekawa, S.
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A high-performance logic circuit diagram reader was developed for VLSI-CAD data input. Almost all logic circuit symbols include one or more loop structures. A description is given of an efficient method for recognition of these loop-structured symbols. The proposed method consists of two processes: symbol segmentation and symbol identification. Symbol identification is achieved by a powerful hybrid method which uses heuristics to mediate between template matching and feature extraction. The entire symbol recognition process is carried out under a decision-tree control strategy. The entire recognition system for circuit diagrams is briefly explained, including character string recognition and connecting line analysis

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Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:10 ,  Issue: 3 )