Investigations on a measurement algorithm of the slab surface temperature based on linear array CCD

Abstract

In order to accurately measure the slab temperature in continuous casting secondary cooling zone and thus realize the closed-loop control, an accurate measurement system of slab surface temperature based on the linear array charge-coupled device (CCD) of a peripheral component interconnect (PCI) data acquisition card is designed, and its overall hardware scheme is given. The polynomial interpolation method is used to detect the sub-pixel edge of the acquired image to achieve accurate measurement at the sub-pixel level. The noise of the CCD image is also analyzed, and a sub-band filtering algorithm based on wavelet transform is proposed to remove the CCD noise. The filtering effect is obvious.