ABNORMALITY DETECTION DEVICE AND ABNORMALITY DETECTION METHOD

An abnormality detecting apparatus includes cameras 81 and 82 for capturing images of a workpiece 1 to be rolled that is an object to be detected for a rolling abnormality while the workpiece 1 is being rolled, a luminance standard value setting section 91 for extracting the workpiece 1 from at least one image captured by the cameras 81 and 82 and determining a luminance standard value by which the workpiece 1 is assessed as lacking an abnormality from luminance data of pixels within a range of the workpiece 1, and an image processing section 92 for extracting the workpiece 1 from each of one or more comparative images among one or more of the captured images and detecting a rolling abnormality on a surface on the basis of the luminance difference between the luminance data within the range of the workpiece 1 and the luminance standard value. There are thus provided an abnormality detecting apparatus and an abnormality detecting method that are capable of increasing the accuracy with which to detect a strip rolling abnormality compared with the conventional art.