Table 1.

Recognition rates of 4 kinds of tongue image extraction methods.

Method	Light red tongue	Light white tongue	Red tongue	Deep red tongue	Purple tongue	Tongue with thick white coating	Tongue with thick yellow coating
Geodesic active contour	94.53%	89.16%	71.81%	56.98%	66.81%	83.58%	61.23%
Method based on mathematical morphology and HSI	95.34%	95.71%	88.01%	96.48%	82.99%	67.88%	5.61%
Method based on sequential algorithm and HSI	92.28%	93.15%	96.07%	90.23%	92.45%	95.60%	72.18%
Our method with fusion of color and space information	93.20%	95.66%	95.14%	91.43%	92.02%	93.01%	83.89%