Automatic segmentation method for electrical equipment drawing

The invention discloses an automatic segmentation method for an electrical equipment drawing, and the method comprises the steps: recognizing an image in the electrical equipment drawing, and carrying out the graying and binarization preprocessing of the image; boundary removal is carried out on the obtained binary image; then automatically selecting a segmentation threshold value by using a set threshold value selection rule to segment the image, thereby obtaining rectangular frame information containing a loop module; carrying out segmentation region combination on the obtained rectangular frame to obtain accurate position information of each loop module; and taking out and storing the images of the loop modules by using the position information. According to the method, the redundant boundary area on the outermost periphery in the electrical drawing of the electrical equipment is removed by adopting the boundary, so that the problem of misjudgment of the segmentation position caused by subsequent segmentat