The fast recognition method for circle group based on regional data acquisition and sub-pixel technology

This paper introduces a novel method for quickly measuring micro circles and holes group in the process of micro forming. The image of them is binary processed and segmented as connected regions. A moving data acquisition window is established to collect the edge point data of connected region to make circle fit. Then a new data recognition range is built. The edge points in the new data recognition range meeting the requirements are used to make circle fitting by image multiplexing and sub-pixel technology. The recognition of the circle group would be accomplished with the moving of the data acquisition window. The method uses a low memory utilization rate. It possesses the characters of quick recognition speed and strong anti-interference ability because of the moving data acquisition window technology, image multiplexing and the sub-pixel technology.