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

Table 3

Efficiency comparisons 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	406.625 seconds	441.688 seconds	445.641 seconds	447.125 seconds	468.000 seconds	340.922 seconds	548.750 seconds
Method based on mathematical morphology and HSI	0.297 seconds	0.313 seconds	0.297 seconds	0.313 seconds	0.297 seconds	0.312 seconds	0.234 seconds
Method based on sequential algorithm and HSI	0.484 seconds	0.156 seconds	0.171 seconds	0.157 seconds	0.172 seconds	0.157 seconds	0.172 seconds
Our method with fusion of color and space information	14.969 seconds	22.062 seconds	25.375 seconds	18.906 seconds	25.921 seconds	56.829 seconds	15.063 seconds