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Proceedings Paper

System for line drawings interpretation
Author(s): 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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Paper 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.

Paper Details

Date Published: 1 August 1992
PDF: 11 pages
Proc. SPIE 1661, Machine Vision Applications in Character Recognition and Industrial Inspection, (1 August 1992); doi: 10.1117/12.130291
Show Author Affiliations
L. Boatto, IBM Rome Scientific Ctr. (Italy)
Vincenzo Consorti, IBM Rome Scientific Ctr. (Italy)
Monica Del Buono, IBM Rome Scientific Ctr. (Italy)
Vincenzo Eramo, IBM Rome Scientific Ctr. (Italy)
Alessandra Esposito, IBM Rome Scientific Ctr. (Italy)
F. Melcarne, IBM Rome Scientific Ctr. (Italy)
Mario Meucci, IBM Rome Scientific Ctr. (Italy)
M. Mosciatti, IBM Rome Scientific Ctr. (Italy)
M. Tucci, IBM Rome Scientific Ctr. (Italy)
Arturo Morelli, IBM Milan Scientific Ctr. (Italy)


Published in SPIE Proceedings Vol. 1661:
Machine Vision Applications in Character Recognition and Industrial Inspection
Donald P. D'Amato; Wolf-Ekkehard Blanz; Byron E. Dom; Sargur N. Srihari, Editor(s)

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