| 摘要 |
<p>There is disclosed a method and apparatus for inspecting plain web fabric for faults in which the fabric is moved relatively to a line scan camera forming a line pixel image across the width of the fabric so as to form successive line images spaced apart comparably to the pixels of the line image and a succession of such line images is stored in a frame store so as to constitute an area image of a rectangular area of the fabric, said area image is processed by thresholding to isolate trigger areas from background areas, the thresholded area image is filtered to eliminate (as noise) trigger areas of small pixel number leaving only defect triggers, and a defect signal generated if at least one defect trigger is present in the filtered image.</p> |
