METHOD AND ARRANGEMENT FOR DETECTING FREE FIBRE ENDS IN PAPER

摘要

The invention relates to a method and arrangement for detecting free fibre ends in a paper surface. The method comprises illuminating a target sample (6) surface, which comprises free fibre 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 fibre ends in a paper surface.

主权项

1. A method for detecting free fibre ends in a paper surface, the method comprising
illuminating a target sample surface, which comprises free fibre ends, from at least two directions one direction at a time, with at least one light source, obtaining for each light source direction an original reflectance image for the target sample surface with an imaging device, estimating a surface normal for each image pixel of the original reflectance image, reconstructing a reconstructed reflectance image from the estimated surface normals, and comparing the reconstructed reflectance image and the corresponding original reflectance image and constructing a difference image, where the differences represent shadow objects of the free fibre ends in a paper surface.