A Comparative Study of Contemporary Color Tongue Image Extraction Methods Based on HSI

Table 2

Error 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	7.17%	0.00%	0.00%	0.23%	0.00%	2.26%	0.00%
Method based on mathematical morphology and HSI	0.88%	1.08%	0.00%	1.65%	0.00%	0.00%	0.00%
Method based on sequential algorithm and HSI	0.13%	1.93%	1.35%	0.55%	0.30%	2.03%	37.05%
Our method with fusion of color and space information	0.04%	1.17%	0.08%	0.40%	0.00%	0.40%	0.00%