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.
［1］伍济钢. 薄片零件尺寸机器视觉检测系统关键技术研究［D］. 武汉:华中科技大学, 2008:2-10.
［2］祝宏, 曾祥进. Zernike 矩和最小二乘椭圆拟合的亚像素边缘提取［J］. 计算机工程与应用, 2011, 47(17):148-150.
［3］段振云,王宁,赵文辉,等.基于高斯积分曲线拟合的亚像素边缘提取算法［J］. 计量学报,2016,37(4):371-374.
［4］Devernay F. A Non-Maxima Suppression Method for Edge Detection with Sub-Pixel Accuracy［C］// Rapport De Rechercheinstitut National De Recherche En Informatique Et En Automatique,1995. https://doi.org/10.1.1.35.1863.
［5］Rockett P. The accuracy of sub-pixel localisation in the canny edge detector［C］// Proc. of the British Machine Vision Conference. BMVC 1999:392-401.
［6］Hermosilla T, Bermejo E, Balaguer A, et al. Non-linear fourth-order image interpolation for subpixel edge detection and localization［J］. Image Vision Comput, 2008,26(9):1240-1248.
［7］Tan J B, Ao L, Cui J W, et al. Subpixel edge location based on orthogonal Fourier-Mellin moments［J］. Image and Vision Computing, 2008, 26(4): 563-569.
［8］Trujillo-Pino A, Krissian K. Accurate subpixel edge location based on partial area effect ［J］. Image and Vision Computing, 2013, 31(1):72-80.
［9］张爱丽,佟首峰,韩成. 基于CCD的光斑能量分布测量及特性分析［J］. 激光与红外, 2011, 41(6):622-626.
［10］Steger C. 机器视觉算法与应用［M］. 杨少荣, 吴迪靖, 段德山, 译. 北京:清华大学出版社, 2008.
［11］Canny J. A computational approach to edge detection［J］.IEEE Transactions on Pattern Analysis and Machine Intelligence,1986, 8(6):679-698.
2018, Vol. 39 
