Robust determination of edge waves of a metal strip

Abstract

A metal strip (2) that extends in a width direction (yB) over a strip width (b) from an operator-side to a drive-side strip edge (4, 5) runs out of a roll stand (1) in a direction of transport (xB). An evaluation means (13) iteratively and repeatedly receives from a camera (8) an image (B) of the metal strip (2) captured by the camera (8). The camera (8) is arranged laterally above the metal strip (2). The evaluation means (13) determines, in a two-dimensional coordinate system relating to the respective image (B), for the operator-side and the drive-side strip edge (4, 5), the value of the one coordinate (y) as a function of the other coordinate (x) and thereby determines in the respective image (B) a characteristic of the respective strip edge (4, 5) as a function of the other coordinate (x). The evaluation means (13) uses the functional characteristic of the respective strip edge (4, 5) within a respective evaluation range (16) of the images (B) to determine a measure (M1, M2) for the edge waviness of the respective strip edge (4, 5).

Dependencies are inferred from the claim text.