Digital image based rapid solving method of circle parameters

The invention relates to a digital image based rapid solving method of circle parameters, which comprises the steps of: 1, acquiring an image of a measured object by using a digital image sensor to establish a plane coordinate system; 2, carrying out Histogram analysis on the image to determine a threshold suitable for separating a boundary of a circle to be measured; and carrying out region segmentation on the acquired image to set a square region including the circle to be measured; 3, selecting an inner point of the circle according to the threshold determined in the step 2, and searching from the point to obtain a point at the edge of the circle to be measured in the image; 4, setting a dynamic step length S, obtaining a point set sequence at the edge of the circle to be measured according to an edge point searching rule in the step 3; and 5, solving coordinates of the center of the circle and diameter parameters of the circle. The invention can be applied to the geometric parameter measurement of a circu