To provide an inspection device of a sheet, capable of precisely inspecting the defect having a different tissue structure of which the inspection has been difficult, and capable of extracting the defect in high accuracy even if a disturbance such as the bending of the warp and the waving of the surface are present.
This inspection device for sheet having a tissue structure, having a camera-scanning means for scanning a camera in a direction orthogonal to the traveling direction of the sheet, an image-taking means for taking the image of the surface of a sheet-like material in the scanning step, a statistic-processing means for processing the taken image data to a statistic value, and an abnormal value-judging means for judging the presence or absence of the abnormal value by comparing the statistic value extracted by the statistic-processing means with a previously set standard value, has a statistic information-extracting means for scanning the camera over the whole width of the sheet and extracting the static value based on the image taken at each position, and a standard value-setting means for setting the standard value for judging the good or bad, usable for the inspection based on the statistic value of the whole width of the sheet obtained by the statistic information means.
UEDA KENJIRO
OHAMA ICHIRO
