Knowledge-Based Approach for the Verification of CAD Database Generated by an Automatic Schematic Capture System

CAD database generated by an automatic schematic capture system needs to be verified before it can be used in design automation. This verification is best performed by a knowledge-based expert system. Presented in this paper is the design of a knowledge-based system for the verification of CAD database generated by AUTORED. Database-driven, pattern-directed inference technique is employed to identify and correct erroneous data records due to misrecognition. This knowledge-based verification system has been implemented on a VAX 11/750 equipped with a video camera to read circuit diagrams into the computer. Integration of this verification system into AUTORED makes the automatically generated database accurate for design automation applications.