Journal of Intelligent Computing Mitsuharu Matsumoto 4 4 2013 http://www.dline.info/jic/fulltext/v4n4/3.pdf In this paper, we propose a light robust edge preserving smoothing filter named self-quotient referential ε-filter. Although many filters for edge preserving smoothing have been proposed, as it often uses local information, it is difficult to preserve edge information when the images are taken under light variation. To solve the problems, we pay attention to the feature of self-quotient filter, and combine self-quotient filter and ε-filter. Some experiments were done to show the effectiveness of the proposed method. Throughout the experiments, the validity of our method was verified.