Visual detection method of automobile lock catch rivet point

The invention discloses a visual detection method of an automobile lock catch rivet point. The method is characterized by carrying out camera calibration on a measurement system; loading a detection image of a camera and carrying out pretreatment; using probability Hough conversion to carry out linear detection on an image after pretreatment so as to establish an image primary measurement coordinate system taking a lock catch edge as a standard; carrying out coordinate affine transformation, positioning an area where a rivet point is located in the measurement coordinate system after the affine transformation and using gradient sharpening to carry out processing based on a rivet point self imaging characteristic so that an outline detail of a separation image is clear and measurement accuracy is increased; using random Hough conversion to extract an outline of the rivet point and calculate a rivet point diameter. The method has the advantage that an automobile lock catch rivet point diameter can be effectively detected in a high efficiency and high precision mode.