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:
Nov. 17, 2009
Filed:
Apr. 07, 2004
Richard Walker Browne, Wilmington, DE (US);
Robert V. Canning, Jr., Bear, DE (US);
Michael H. Evans, Newark, DE (US);
Robert William Johnson, Kennett Square, PA (US);
Barry Rubin, Glen Mills, PA (US);
Douglas Ray Stilwell, Wilmington, DE (US);
Richard Walker Browne, Wilmington, DE (US);
Robert V. Canning, Jr., Bear, DE (US);
Michael H. Evans, Newark, DE (US);
Robert William Johnson, Kennett Square, PA (US);
Barry Rubin, Glen Mills, PA (US);
Douglas Ray Stilwell, Wilmington, DE (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
An image analysis method to quantify visual showthrough of printed images on the reverse face of planar objects, such as paper. An illumination level is set using a white reference object. A white reference image is stored in a computer memory. An image of a planar object having a printed image on the reverse face is stored in a computer memory. A pixel by pixel ratio of the two images is calculated and a mean value of the ratios is calculated to characterize the visual showthrough. The measurements are substantially independent of both the illumination level and image shading.