Patent · US Active

Method and apparatus for quantifying visual showthrough of printed images on the reverse of planar objects

US7620211B2 · kind B2 · utility

16Cited by

15References

18Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Richard Walker Browne · Wilmington, US
Robert Vincent Canning, Jr. · Bear, US
Michael Evans · Ekeren, BE
Robert W. Johnson · Raleigh, US
Barry Rubin · Glen Mills, US
Douglas Ray Stilwell · Wilmington, US

Key dates

Filing date	Apr 7, 2004
Grant date	Nov 17, 2009
Priority date	—
Expiry date	Jun 26, 2026

Classification

Technology area (CPC G)Physics
CPC primaryG01N2021/8663
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.