Study on a method for suppressing influence of nonuniform surface emissivity of material in eddy current thermography

The nonuniform emissivity of material surface will adversely affect the detection results thermal imaging technology. Aiming at influence uneven on dynamic mode eddy current thermography, a suppression method based edge is proposed in this paper. Since traditional threshold selection methods are not ideal, local adaptive (LATS) applied study. This can automatically obtain optimal for to suppress emissivity. Roberts, Sobel, Prewitt, and Canny operators tested by using LATS. show that Prewitt achieve effect, but effect Sobel similar better than Roberts.