On-Line Defect Discrimination of Knitted Fabrics by the Narrow Band Eliminating Spatial Filtering Method -Analysis in Spatial Frequency Domain-

협대역 제거형 공간필터법에 의한 직물 결함의 온라인 종류판별 -공간주파수 영역에서의 해석-

The defects occurred in knitted fabrics have several types due to some trouble sources. In particular, the defects caused by knitting machine troubles give a serious damage to the whole webs. It is, therefore, necessary to discriminate the kind of defects. The method to discriminate the type and size of defects has been proposed, which is used a pair of narrow band eliminating spatial filters. This method is based upon an isotropic signal processing in time domain. This paper is to confirm that the proposed method can be useful in the discrimination of defects, having analyzed in spatial frequency domain.