Online visual inspection method for curled edge of cast film

The invention relates to the technical field of image data processing, in particular to an online visual detection method for a curled edge of a cast film. The method comprises the following steps: acquiring a cast film image; constructing a preset window for pixel points in the casting film image; taking an area of the preset window in the brightness component image as a first target area, and obtaining a wrinkle possibility coefficient of pixel points in the cast film image corresponding to the first target area; according to the positions of the pixel points in the cast film image and the wrinkle possibility coefficient, the edge disorder degree is obtained; taking the corresponding area of the preset window in the brightness component image as a second target area, and obtaining the brightness change degree of pixel points in the cast film image corresponding to the second target area; according to the edge disorder degree and the lightness change degree, obtaining a transparent change saliency value, and