Abstract:In order to realize the feedback control for variable polarity plasma arc weld (VPPA W) formation in the weld process, the geometrical sizes of the keyhole image must be extracted. " t h the properties of multiscale edge through the wavelet theory, the edge points were detected by getting the maximum modulus of the gradient vector in the direction towards which the gradient vector points in the image plane. At coarse scales, the local maxima of modules have different positions and only detected the sharp edge… Show more
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