The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 1991
Filed:
Jul. 27, 1987
Robert H Thibadeau, Pittsburgh, PA (US);
Donnell M Heyse, Pittsburgh, PA (US);
Visual Understanding Systems, Inc., Pittsburgh, PA (US);
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.