A Kalman Filtering and Nonlinear Penalty Regression Approach for Noninvasive Anemia Detection with Palpebral Conjunctiva Images

Table 2

The index of each level in RES.

	High-risk index	Doubtful index	Low-risk index
KF + R + linear regression (adopted from [38])	0.6923	0.56	0.9000
KF + erythema index + linear regression [10]	0.9545	0.44	1.0000
KF + hue + nonlinear penalty regression [39]	0.4783	0.42	0.8947
KF + R + nonlinear penalty regression (proposed algorithm)	0.6400	0.68	0.8837