公开(公告)号：US06621915B1

公开(公告)日：2003-09-16

申请号：US09515212

申请日：2000-02-29

申请人： Hung-Jen Chen ,  Hsin-Chung Lien ,  Chih-Hua Liu ,  Ding-Kuo Huang

发明人： Hung-Jen Chen ,  Hsin-Chung Lien ,  Chih-Hua Liu ,  Ding-Kuo Huang

IPC分类号： G06K9100

CPC分类号： G01N21/8983 ,  G06T7/0004 ,  G06T2207/30124

摘要： The present invention disclosed a method and system inspecting cotton web homogeneity by a digital image processing technique, in particular, for an on-line cotton web homogeneity test. It uses optical principles in conjunction with a charge coupled device type camera to find a theoretical equation indicating the correlation between the transmittance of cotton webs and basic weights (weights per unit area). Next, the invention makes use of a numerical analysis method to find the optimal approximation equation representing a relationship between measured transmittance and basic weights of cotton webs. When executing an on-line inspection, a system according to the invention detects the transmittance of cotton webs by means of the computer controlled visual device and then calculates correlated data of cotton web homogeneity variations according to the approximation equation acquired previously. Besides, the system can monitor production operation and detect any abnormal conditions or periodical variations in production through a quick Fourier transformation of homogeneity variations. The invention can be applied to on-line web homogeneity tests either for cotton webs or for other materials like paper or non-woven fabric.

摘要翻译： 本发明公开了一种方法和系统，通过数字图像处理技术，特别是用于在线棉花网均匀性测试来检查棉花网均匀性。 它结合电荷耦合器件类型的相机使用光学原理来找到指示棉幅的透射率与基重（相对于每单位面积的重量）之间的相关性的理论公式。 接下来，本发明利用数值分析方法来找到表示棉幅的测量透射率和基重之间的关系的最佳近似方程。 当执行在线检查时，根据本发明的系统通过计算机控制的视觉设备检测棉幅的透射率，然后根据先前获得的近似方程计算棉花网均匀性变化的相关数据。 此外，系统可以通过快速傅里叶变换均匀性变化来监控生产操作并检测生产中的任何异常情况或周期性变化。 本发明可以应用于棉网或用于其它材料如纸或无纺织物的在线网均匀性测试。