Method for evaluating pilling degree of fabric surface

The invention provides a method for evaluating the pilling degree of a fabric surface which comprises the following steps: S10, acquiring an input fabric surface image, and preprocessing the fabric surface image; S20, for each channel of the preprocessed image, performing coarse segmentation on the fuzzy ball in a Fourier transform domain by using a frequency spectrum filtering method; S30, enhancing a rough segmentation result by adopting a histogram equalization method; S40, extracting a minimum value region of the enhanced fabric sample image by using a fabric fuzzy ball fine segmentation algorithm based on maximum stable extremum region detection, and removing small regions which are not fuzzy balls by using a morphological method to obtain a fine segmentation result of the fuzzy balls; s50, processing the fuzzy ball detection results of the RGB three channels of the fabric sample image to obtain a final fuzzy ball area; and S60, evaluating the grade of the fuzzy ball according tothe proportion area of th