Abstract: In order to evaluate the color fastness grade of fabric after frequent laundering objectively, a method based on image analysis is proposed in this paper, and then the feasibility of the computer vision evaluation for color fastness is also discussed. Firstly, the images of different grades of the Gray Scale for Color Change and Gray Scale for Staining for AATCC 61-2010 are scanned to calculate their corresponding gray values. Secondly, the equation of grade for color change-gray values and the equation of grade for staining-gray values are fitted by analyzing the relationship between the gray values of Color Change and its grade, respectively. To verify the effectiveness of the method proposed in this paper, the test results are compared with the ones of visual evaluation according to AATCC 61-2010 under the same washing conditions. The experimental results indicate that the evaluation method for color fastness grade based on image processing has good consistency with the visual evaluation method, and the former is more simple, objective and accurate than the latter, comparatively.

Key words: fabric, grade evaluation of color fastness, image processing, curve fitting, accelerated laundering