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 50.00 mm × 40.00 mm product,the standard deviation of major axis and minor axis decreases by 1.71％ and 17.78％,respectively,and for the 50.05 mm × 40.05 mm product,the standard deviation of major axis and minor axis decreases by 38.66％ and 2.03％,respectively.%提出基于边缘像元投影的汽车发动机进气歧管高精度亚像素边缘检测方法.利用物体边缘投影将其所穿过的感光单元划分2个部分,边缘像素单元的最终灰度值为投影两侧局部灰度统计值的面积加权平均值,并利用矩形邻域建模求得边缘亚像素的准确位置.对汽车发动机进气歧管的实验结果表明,与基于曲面拟合的亚像素边缘检测方法相比,对50.00 mm×40.00 mm规格产品,长短轴标准差分别降低了1.71％和17.78％,对50.05 mm×40.05 mm规格产品,长短轴标准差分别降低了38.66％和2.03％.
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