Abstract
There are many kinds of methods to measure the density, i.e. the number of warp and weft existing in the unit length of fabric. One of the methods to measure the density is to count the number of warp and weft yarns by ravelling the sample or by inspecting with textile analysis glass. Another method is a recognition of the pattern of cloths. The measurement by densi meter is an example of such pattern methods.
While all these methods need the judgement by person, we developed a device to measure the density automatically by nondestructive inspection. Two methods, Fourier method and grille method, are proposed to analyze the optical images obtained by the device. The percentage of correct measurement varies according to the weave of the samples. More than 80% of the plain weave samples are measured correctly. Performance of the grille method is almost equal to that of the Fourier method.
