Defect detection method for waterproof steel plate for ship

The invention relates to the technical field of image data processing, in particular to a marine waterproof steel plate defect detection method which comprises the following steps: acquiring a waterproof steel plate image of a marine waterproof steel plate to be detected, and preprocessing the waterproof steel plate image; carrying out clustering processing on pixel points in the target steel plate image; screening a bright pixel point category and a dark pixel point category from the pixel point category set; determining a target area set; performing clustering processing on the target areas in the target area set; performing fitting detection processing on a target area in the target area category, and determining a defect possibility corresponding to the target area category; and determining defect information corresponding to the target steel plate image. The technical problem of low accuracy of roll mark defect detection on the steel plate is solved by performing image processing on the waterproof steel