System for line drawings interpretation

L. Boatto; Vincenzo Consorti; Monica Del Buono; Vincenzo Eramo; Alessandra Esposito; F. Melcarne; Mario Meucci; M. Mosciatti; M. Tucci; Arturo Morelli

doi:10.1117/12.130291

1 August 1992 System for line drawings interpretation

L. Boatto, Vincenzo Consorti, Monica Del Buono, Vincenzo Eramo, Alessandra Esposito, F. Melcarne, Mario Meucci, M. Mosciatti, M. Tucci, Arturo Morelli

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Proceedings Volume 1661, Machine Vision Applications in Character Recognition and Industrial Inspection; (1992) https://doi.org/10.1117/12.130291
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

This paper describes an automatic system that extracts information from line drawings, in order to feed CAD or GIS systems. The line drawings that we analyze contain interconnected thin lines, dashed lines, text, and symbols. Characters and symbols may overlap with lines. Our approach is based on the properties of the run representation of a binary image that allow giving the image a graph structure. Using this graph structure, several algorithms have been designed to identify, directly in the raster image, straight segments, dashed lines, text, symbols, hatching lines, etc. Straight segments and dashed lines are converted into vectors, with high accuracy and good noise immunity. Characters and symbols are recognized by means of a recognizer, specifically developed for this application, designed to be insensitive to rotation and scaling. Subsequent processing steps include an `intelligent'' search through the graph in order to detect closed polygons, dashed lines, text strings, and other higher-level logical entities, followed by the identification of relationships (adjacency, inclusion, etc.) between them. Relationships are further translated into a formal description of the drawing. The output of the system can be used as input to a Geographic Information System package. The system is currently used by the Italian Land Register Authority to process cadastral maps.

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L. Boatto, Vincenzo Consorti, Monica Del Buono, Vincenzo Eramo, Alessandra Esposito, F. Melcarne, Mario Meucci, M. Mosciatti, M. Tucci, and Arturo Morelli "System for line drawings interpretation", Proc. SPIE 1661, Machine Vision Applications in Character Recognition and Industrial Inspection, (1 August 1992); https://doi.org/10.1117/12.130291

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KEYWORDS

Image segmentation

Geographic information systems

Raster graphics

Detection and tracking algorithms

Binary data

Data acquisition

Image processing

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