Patent ID: 6621915
Filing Date: 2003-09-16
Classification: G01N,G06T

Abstract:
An on-line cotton web homogeneity inspection method using a digital image processing technique characterized in that an mathematical equation representing the relationship between transmittance of cotton webs and its basic weight can be acquired by a video camera and a light source, and in that an optimal approximation equation results from data collected and processed by a computer by means of optical principles and numerical analysis, and in that in on-line tests the transmittance measured by said computer is converted by said optimal approximation equation into basic weight variation charts, including a CV % dynamic curve chart, a basic weight statistic chart, a basic weight control chart and a basic weight dynamic curve chart, and in that said computer generates a Fourier transformation spectrum diagram on the basis of the variations of cotton web homogeneity, from which spectrum diagram said computer can detect any abnormal operation and periodical variations of machines.