System for representing line drawings by polygonal lines

Details System for representing line drawings by polygonal lines System for representing line drawings by polygonal lines

1993-04-16

1994-05-17

Conso, Yon J.

Image analysis

Histogram processing

For setting a threshold

382 23, 395143, G06K 946

Patent

active

053135296

ABSTRACT:
A system for representing line drawings by polygonal lines. In the system, a binary digital image is scanned in a main scanning direction to form picture element connection data with a first image picture element as a start point picture element which is scanned next to a first background picture element and with a second background picture element as an end point picture element which is scanned next to a second image picture element, and the relationships between the picture element connection data are detected to provide as picture element block data a group of picture element connection data which have predetermined relationships. Further, it is determined from each picture element block data whether or not the picture element block thereof represents a straight segment, and straight line approximation data is provided according to both the uppermost picture element connection data and the lowermost picture element connection data in the picture element block when it is determined that the picture element block represents a straight segment, whereby parts of the drawing to be represented by polygonal lines are detected and processed with high efficiency.

REFERENCES:
patent: 4163213 (1979-07-01), Nadler
patent: 4375654 (1983-03-01), Evans et al.
patent: 4718103 (1988-01-01), Suojima et al.
patent: 4975853 (1990-12-01), Shimizu et al.
patent: 5036544 (1991-07-01), Sakaue et al.
patent: 5064439 (1991-11-01), Takasaki et al.

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