SYSTEM FOR MONITORING A WEB AND A CORRESPONDING METHOD FOR MONITORING THE WEB

摘要

The invention relates to a system for monitoring a web, for example a paper web, which system includes - at least one set of lighting elements, general cameras (10) for imaging the web (16) over essentially the entire width of the web (16), at least one processing unit (30) with image- processing software (37) for analysing the images taken using the general cameras (10), at least two precision cameras (10') for imaging the web (16) in a specific illumination geometry at a substantially greater precision relative to the surface area than the general cameras (10), to detect small deviations, - at least one processing unit (30) with image-processing software for analysing the images taken by the precision cameras (10'), - a camera beam (28), - a host unit (34), - a user interface (32), and - a data-transfer network (43). The system further includes software means (65) for statistically analysing the deviations of the images taken by the precision cameras (10'), to create a result covering the entire web. The invention also relates to a corresponding method.