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authors Freeman, Herbert
year 1974
title Computer Processing of Line-Drawing Images
source March, 1974. vol. 6: pp. 57-97 : ill. includes bibliography
summary This paper describes various forms of line drawing representation, compares different schemes of quantization, and reviews the manner in which a line drawing can be extracted from a tracing or a photographic image. The subjective aspects of a line drawing are examined. Different encoding schemes are compared, with emphasis on the so-called chain code which is convenient for highly irregular line drawings. The properties of chain-coded line drawings are derived, and algorithms are developed for analyzing line drawings to determine various geometric features. Procedures are described for rotating, expanding, and smoothing line structures, and for establishing the degree of similarity between two contours by a correlation technique. Three applications are described in detail: automatic assembly of jigsaw puzzles, map matching, and optimum two-dimensional template layout
keywords image processing, computer graphics, B-rep, mapping
series CADline
references Content-type: text/plain
last changed 1999/02/12 14:08
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