Method for detecting defect of textured surface

The invention discloses a method for detecting the defect of a textured surface. The method comprises the following steps: firstly acquiring an image of a product through a camera, and carrying out brightness normalized correction; secondly filtering a surface texture background by adopting a non-linear range filter; then carrying out logarithm, exponent and power operation processing and the like on the image to enhance a fine defect; then extracting a candidate defect area by adopting an Niblack threshold value method; finally identifying the defect. The method disclosed by the invention can be used for eliminating the disturbance brought by the surface textures of the product and the brightness nonuniformity of various areas and carry out enhanced processing on the fine defect, thereby fast and accurately detecting the surface defect of the product.