147 Electronic Schematic Recognition Donald Bailey 1, Andrew Norman 2, and Giovanni Moretti 2 1 Physics Department and 2 Computer Science Department Massey University Palmerston … … D.G.Bailey@massey.ac.nz, G.Moretti@massey.ac.nz We demonstrate the feasibility of using image analysis for automatically converting from a scanned electronic circuit schematic to a netlist of the components and their connections. A preprocessing stage removes non-components from the image (component label and values). The image is then…

We demonstrate the feasibility of using image analysis for automatically converting from a scanned electronic circuit schematic to a netlist of the components and their connections. A preprocessing stage removes non-components from the image (component label and values). The image is then segmented to produce a set of graphical primitives (lines, circles, and arrows). The recognition stage uses rule-based templates to match primitives to components. At present, the software will only recognise a limited range of components, although the rule-based approach allows the system to be extended to handle a wider range of component types or styles. The final stage constructs a netlist of components and their connectivity. Netlists are frequently used to represent electronic circuits for simulation. Keywords: electronic schematics, circuit recognition, image analysis, circuit netlists. 1. NEED FOR SCHEMATIC RECOGNITION Circuit diagrams, or schematics, are a standard means of representing electronic circuits. While this format is excellent for conveying much of the relevant circuit details in visual form to scientists, engineers, and hobbyists, it is not able to be readily manipulated or processed by computers. Having a circuit in computer useable form is required for such applications as automated layout of printed circuit boards, simulating the electrical characteristics of the circuit, and maintaining a database of circuits or circuit modules. In all of these, a suitable representation of the circuit is as a netlist, that is as a list of components and their interconnections. This project is examines the feasibility of using image analysis for automatically obtaining netlists from circuit schematics in printed form. This process involves recognising the various electronic component symbols within the schematic and determining their connectivity. Image of Circuit Schematic Output Netlist Component Database Electronic Schematic Recognition System…

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