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Research on the size measurement of porous parts based on machine vision

In order to improve the accuracy and efficiency of the size measurement of porous parts, this paper presents a high-precision measurement method base on Machine Vision. First of all, the Sobel operator was used to edge coarse positioning, and then the improved cubic spline interpolation algorithm with bilinear interpolation was used to locate the edge on higher precision. Experimental results showed that this method has the advantage of higher efficiency; it can reach the level of sub-pixel level in the measurement precision.