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Six cases of fissured tongue images and data preprocessing results: (a) the cracks in the picture are evenly distributed and obvious; (b) the cracks in the picture are scattered and obvious; (c, d) the crack distribution in the picture is scattered and not obvious; (e) the cracks in the picture are widely distributed and obvious, which is difficult to segment; (f) the crack distribution in the picture is single and easy to segment.
