Abstract: In order to evaluate the stain release grade after washing objectively, a method based on image analysis is proposed, and then the feasibility of the computer vision evaluation for stain release with washing machine is discussed in this paper. Firstly, the images of the different stain release grades of the AATCC130 standard replicas is captured by scanner, then the regression analysis about the relationship between stain intensity of the stain region and its grade is carried out. Secondly, the Intensity-Grade equation is fit by using least square method to calculate the stain grade of all the test samples after washing with different times. The research results showed, increasing grade 0.5, grade 1.5 and grade 3.5 based on 5grades evaluation of AATCC 130 standard, the modified 8 grades evaluation is more reasonable. Compared with the manual evaluation, the evaluation of stain release grade based on image analysis is much more accurate and objective.

Key words: rating evaluation of stain release, stain-release rating-intensity equation, image analysis, least square method, linear regression