An Improved Method of Hough Transform for Circle Recognition Based on Optimized Gradient
Kui He, YP Hu · 2017
For the situation in which the low accuracy of circular hole recognition in hole workpiece based on image processing technology, a method of Optimized Gradient Hough Transform(OGHT) for circle recognition is proposed.Based on the Standard Hough Transform (SHT), the OGHT is used to extract the edge feature firstly, then select a certain number of edge pixels to evaluate the gradient to determine the center of circle.Next, calculating and sorting the coincidence degree between the rounds recognized by Standard Hough Transform and the edge in source image, and finally the highest rank is identified as the circle we needed.The proposed method is verified by comparative experiments, which improves the accuracy of circle recognition with little effect on efficiency.