Tongue image with coating is of important clinical diagnostic meaning, but traditional tongue image extraction method is not\ncompetent for extraction of tongue imagewith thick coating. In this paper, a novel method is suggested,which appliesmultiobjective\ngreedy rules and makes fusion of color and space information in order to extract tongue image accurately. A comparative\nstudy of several contemporary tongue image extraction methods is also made from the aspects of accuracy and efficiency. As\nthe experimental results show, geodesic active contour is quite slow and not accurate, the other 3 methods achieve fairly good\nsegmentation results except in the case of the tongue with thick coating, our method achieves ideal segmentation results whatever\ntypes of tongue images are, and efficiency of our method is acceptable for the application of quantitative check of tongue image.
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