There has been an appreciable increase in development of image processing applications in steel industries. In this paper, we are going to describe a measurement system to get flatness defect indexes of products in hot strip mills. This system has been developed with lasers and linear-scan cameras. Every line scan camera is connected to a line scan processor board. All boards are in an industrial personal computer (industrial-PC) which governs the operation of boards. Moreover, it is possible to use an additional digital signal processor to accelerate the computation of algorithms. Flatness measurement devices, based on the optical triangulation principle, has installed successfully by some manufacturers like Lasershape, CRM Rometer, etc.
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