| 摘要 |
A web inspection system has a plurality of time-delay-and-integration transversely spaced cameras (104) synchronized by a pulse encoder (110) sensing web movement. Each camera output is digitized and stored in a parallel memory (584) of a corresponding video processing unit (218) where parallel series processors (590) detect white count, black count, and center value of defects. A control computer (592) for each video processing unit reads the data outputs of the series processors and transmits the defect data and position information to a system computer (202). The system computer determines a defect type and absolute position from the transmitted data and data from a web position register (340). A carriage (126) supporting a plurality of illumination bulbs (120, 122, 124) is rotated to position the next bulb to illuminate the web when a burnt-out bulb is detected. |
