Measurement Method of Textile Deformation by DIC Method with Interlace Points as Measuring Points

In order to ensure the in-line measurement of the deformation state of a woven fabric in a production process, the present paper proposes a measurement method for the textile deformation by the digital image correlation (DIC) method with each interlace point of the warp and weft as a measuring point. In the proposed method, utilizing the periodic weave of woven fabric, each interlace point of the warp and weft in the initial image is detected by the template matching. Detecting individually the interlace points on the warp and weft can evaluate the textile deformation based on the warp and the weft. Furthermore, the time change of the displacement of each detected interlace point as a measuring point can be measured by the DIC method. In the DIC method, by using the calculated yarn density, the searching area in which a subset image is swept to evaluate the correlation coefficient, is set to prevent the false detection due to the periodic weave. Conducting an experiment simulating the conveying a weave fabric, the spatial distributions and time changes of the oriental angle, stretch ratio and yarn density of the weave sample are measured to reveal the usefulness of the proposed method.