Camera calibration method based on circular dot matrix calibration plate

The invention discloses a camera calibration method based on a circular dot matrix calibration plate, and the method completes the conversion from pixel points to calibration plate coordinate system points through the one-to-one correspondence between the pixel coordinates of the feature points of the calibration plate in an image and the actual coordinates of the feature points, thereby achieving the calibration of internal and external parameters of a camera. According to the method, a high-precision dot matrix calibration plate is shot, dot contour sub-pixel coordinates in an image are extracted by using an algorithm, an ellipse center is fitted, and relative rows and columns between adjacent dots are calculated by using a position relationship and a geometrical relationship between the dots. According to the method, the calibration process is simple, the whole process is automatic and high in precision, in the general calibration process, due to improper placement position of a calibration plate and irrad