Of a flat bottle label sticking automatic defect detection method

Of a flat bottle label sticking automatic defect detecting method, comprising an illumination image capturing system, image processing system, arithmetic processing system; the illumination system of the image acquisition for taking image of the label affixed to the bottle; sequentially by the image processing system: image contrast scaling transform, image noise reduction, image thresholding, the image of the bottle filling process the obtained image preprocessing; position of said algorithm processing system, locating the bottle in the bottle and the bottle set-point image, and pose of the label when the label is pasted correctly the special point, and the pose of the image to be detected in the special tag points are compared in order to determine whether a label pasted defective. The present invention can detect the flat bottle used tags and the general method of visual detection method for detecting defects not detectable label attached.