Image analysis on apparent parameters of slub yarn

In order to recognize regular slub yarns′ apparent parameters,slub yarn which was uniform ly wound on black board was scanned and the grayscale and binary image of it was obtained.The d igital image processing technology was used to rotate image and connect yarn on both sides in order to composite a continuous slub yarn image.Taking advantage of the correlation of period ic functions based on read ing d iameters of slub yarn,apparent parameter change period of slub yarn was determ ined.Based on analysis of the frequency of slub yarn′s d iameter in several change periods,the d iameters of the basic part and the slub part of the yarn were determ ined.By further analyzing the length of sections of certain amount of slub yarns appeared period ically,demarcation positions between basic part and slub part were found,thus the length of each basic part and each slub part was obtained and complete slub yarn′s apparent parameters were given.