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 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.