Abstract：An accurate subpixel edge detection method based on edge pixel projection for vehicle engine intake manifolds is proposed. The light-sensitive cells on the edges are divided into two different parts. The final gray value of the edge pixel is calculated by weighted average of its both side gray statistics values. The accurate subpixel edge can be obtained by the rectangle neighbourhood model. Compared with the method based on surface fitting, experimental results show that, for the 50.00mm×40.00mm product, the standard deviation of major axis and minor axis decreases by 1.71% and 17.78%, respectively, and for the 50.05mm×40.05mm product, the standard deviation of major axis and minor axis decreases by 38.66% and 2.03%, respectively.
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2018, Vol. 39 
