Abstract: A method of measuring the yarn density of a woven fabric or the stitch density of a knitted fabric by recording a video image of the woven or knitted fabric to be examined by means of a video camera, converting the video image by an analog-to-digital converter into digital video information, storing the digital video information in a digital image memory and converting said information by a central processing unit into the yarn density or stitch density. The digital video information is converted by a digital band filter (14) with central circle frequency (.omega..sub.o) into a yarn or stitch density, and that the digital band filter (14) is arranged in such a manner that it operates according to the formula:Y.sub.k =A.sub.m .multidot.X.sub.k-m +A.sub.m-1 .multidot.X.sub.k-m+1. . . +A.sub.o X.sub.k -B.sub.1 .multidot.Y.sub.k-1 -B.sub.2 Y.sub.k-2. . . B.sub.n Y.sub.k-nwherein:X.sub.k represents a series of points of the digital information characteristic at interspace T before the digital filtering; Y.sub.