Nondestructive Identification of Knot Types in Hand-Made Carpet. Part I: Feature Extraction from Grey Images

Knot (pile) formation has a very important role in evaluation and rating of hand-made carpets. Visual identification of carpet structural elements is impossible even for expert people. This research presents a nondestructive method for recognition of carpet knotting structure. It is based on X-ray r...

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Bibliographic Details
Published in:Journal of nondestructive evaluation 2009-06, Vol.28 (2), p.55-62
Main Authors: Karamad, M. J., Latifi, M., Amani-Tehran, M.
Format: Article
Language:English
Subjects:
Beams (radiation)
Carpets
Characterization and Evaluation of Materials
Classical Mechanics
Control
Dynamical Systems
Engineering
Knots
Piles
Recognition
Solid Mechanics
Structural members
Vibration
X-rays
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Summary:Knot (pile) formation has a very important role in evaluation and rating of hand-made carpets. Visual identification of carpet structural elements is impossible even for expert people. This research presents a nondestructive method for recognition of carpet knotting structure. It is based on X-ray radiography (mammography). Available X-ray beams create visible images from the internal structure of object in two dimensions. Primary radiological images are taken by radiography from hand-made carpets. They are then converted to structural recognizable images by employing different image processing techniques. Considering that the 3-D structure of carpet is projected in 2-D images and understanding the effect of each structural element on the creation of X-ray images, common knot types (piles) including Farsi, Torky, Kaman-Shib, double Farsi, double Torky and double Kaman-Shib are considerably distinguishable.
ISSN:0195-9298
1573-4862
DOI:10.1007/s10921-009-0047-7