Method and arrangement for detecting free fibre ends in paper
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United States of America Patent
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Nov 14, 2017
Grant Date -
Mar 24, 2016
app pub date -
May 9, 2014
filing date -
May 10, 2013
priority date (Note) -
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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 (6) surface, which comprises free fiber ends, from at least two directions one at the time, with at least one light source (1). Original reflectance images are obtained for the target sample (6) surface with an imaging device (4), 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.
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