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Determination of textile parameters with digital image processing

More and more modern technologies are used for designing clothes. One of these technologies is simulation of garments. For simulation some mechanical parameters like Youngsmodulus, Shear-modulus, bending stiffness, surface weight, coefficient of friction between fabric and skin and between like materials, and thickness are necessary and need to be determined through precise measurement. Especially the measurement of the bending stiffness of fabrics can be involved, because a high precision measurement is needed to determine the typically very low bending stiffnesses seen in fabric. In this paper it is shown how the bending stiffness can be accurately measured using digital image analysis. A camera is used to acquire a sideview image of a laser line projected onto the textile loaded by its own weight to realize a spatial triangulation allowing to determine the 3D deflection curve. With the methods of digital image analysis the deflection line can be determined and so the bending stiffness can be calculated via the definition of a higher order differential equation.