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. 14, 2017
Filed:
May. 09, 2014
Kemira Oyj, Helsinki, FI;
Jukka-Pekka Raunio, Tampere, FI;
Mikko Makinen, Espoo, FI;
Henry Skoog, Roswell, GA (US);
Clayton Campbell, Easton, MD (US);
KEMIRA OYJ, Helsinki, FI;
Abstract
The invention relates to a method and arrangement for detecting free fiber ends in a paper surface. The method comprises illuminating a target sample () surface, which comprises free fiber ends, from at least two directions one at the time, with at least one light source (). Original reflectance images are obtained for the target sample () surface with an imaging device (), and a surface normal is estimated for each image pixel of the original reflectance image. Thus it is possible to reconstruct a reconstructed reflectance image from the estimated surface normals, and to compare the reconstructed reflectance image and the corresponding original reflectance image and to construct a difference image, where the differences represent shadow objects of the free fiber ends in a paper surface.