Process for visually detecting a color drift in a polychrome reproduction
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 20, 1991
Grant Date -
N/A
app pub date -
Nov 2, 1989
filing date -
Nov 18, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to the printing industry, and is based on the comparison of a reproduction under inspection with a reference polychrome graphic representation. Respective reference axes (A.sub.1, A.sub.2) are defined for the reference representation and the reproduction under inspection. These axes are normal to and go through an equivalent point of the representation and reproduction, respectively. The two latter are rotated around their reference axes, producing whirling images (D.sub.1, D.sub.2) formed of concentric color rings (a.sub.1, a.sub.2, . . . a.sub.n and a'.sub.1, a'.sub.2, . . . a'.sub.n) each having a set width and shade, and forming a basis for detecting a possible color drift.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully