DEVICE, PROGRAM AND METHOD FOR MEASURING YARN

摘要

The digital image of a yarn is photographed and converted into a two-dimensional Fourier transform image along the longitudinal and lateral directions of the yarn. The low frequency components of the two-dimensional Fourier-transform image corresponding to the yarn body are cut out by a filter and a two-dimensional inverse Fourier-transformation thereof is performed, whereby the image of the yarn body is outputted and the diameter of the yarn is calculated from the image of the image of the yarn body. The diameter of the yarn can be easily and accurately calculated by a digital camera or a scanner.