Evaluation of stain release based on image histogram analysis

In our daily life, subjective and objective method were used to evaluate the washing condition of the stain. But they have some disadvantages, such as subjectivity, special operation in laboratory, limited area, and so on. With the development of technology, the image analysis was widely used in industry. In this article, the pictures of stains before and after being washed were got through image acquisition system. And then histogram based on distance were draw and similarity of stain before and after was calculated. The similarity described the degree of washing. The higher the similarity, the more similar the image, the less stain was washed out. Two different results got from washing efficiency and image analysis were analyzed through SPSS software, the results showed that in less than 0.05 level, two groups of data had a significant correlation. This means that the image analysis could be used to evaluate the stain release well.