Method and apparatus for scanning, storing and reproducing artwo

Details Method and apparatus for scanning, storing and reproducing artwo Method and apparatus for scanning, storing and reproducing artwo

1987-07-27

1991-03-26

Harkcom, Gary V.

Boots, shoes, and leggings

340723, 364518, G06F 1520

Patent

active

050034952

ABSTRACT:
Methods and apparatus for scanning and vectorizing artwork in which a grid is applied to photoplot artwork. Preferably the grid is automatically created from the scanned image of the artwork using the centerline of each line and the center of each pad in the artwork. The methods and apparatus also determine the rotation or skew of the artwork and adjust the image to compensate for any skew that is found. Grid spacing is determined from frequency plots of the artwork which show the number of lines and points that appear in each row of pixels and in each column of pixels. Fourier analyses of the frequency plots give the grid spacing.

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patent: 4888713 (1989-12-01), Falk
"Novel Method for the Analysis of Printed Circuit Images", by Jon R. Mandeville published in SPIE, vol. 54, Applications of Digital Image Processing VII (1984).
"The State of the Art in Printed Wiring Board Inspection", by Robert Thibadeau published in the Carnegie-Mellon University, The Robotics Institute Technical Report, Nov. 1984.
"Problems of Automatic Vectorization of Artwork", by Robert Thibadeau, Sep., 1986.

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