Abstract: A metallic strip edge flatness monitoring system for a rolling mill has one or more thermal imaging devices (105) arranged to monitor temperature or temperature variances across at least one region of interest (108, 115) in the rolling mill. The monitored temperature or temperature variances are input to a flatness control system (107) and a control signal is generated in the flatness control system to modify actuation of actuators (106) in the rolling mill. The region of interest (108, 115) has a width of less than half the width of the metallic strip (101) and has a region on each side of the strip. The total width monitored is less than half the total width of the metallic strip.