| 摘要 |
PURPOSE:To realize accurate formation inspection by detecting the transmission pattern of light as to a specific area of a sheet to be inspected and grasping a formation state as an area. CONSTITUTION:An image pickup device 2 is arranged opposite an illumination device 1, and the beltlike sheet 4 to be inspected is passed between them to detect the quantity of transmitted light in a specific rectangular area 5 as a transmission pattern, whose image data is outputted to the formation measuring instrument 3. The device 3 analyzes the image of the data to extract various feature quantities indicating the features of the formation of the sheet, e.g. a density distribution of the formation and the feature quantities are converted into visible information, which is displayed 18. Consequently, the feature quantities of the formation are extracted from surface information on the sheet 4, so the formation state of the sheet can be grasped and the extent of crowding, etc., of the fiber of the sheet 4 is easily judged, so that the accurate formation inspection is performed. |
