| 摘要 |
While yarn is being fed, a shutter is opened and closed such that the fuzz of the yarn is blurred according to the feeding of the yarn, and a one-dimensional image of the yarn in which the fuzz is blurred is captured along the direction perpendicular to the direction of feeding. Data obtained by capturing the image is Fourier transformed or discrete cosine transformed, and the yarn diameter is found from the frequency at the bottom on the high-frequency side of the peak at the lowest frequency of the transformed data. The yarn diameter can be easily measured without receiving the influence of the fuzz. |
