. Author manuscript; available in PMC: 2008 Jun 1.

Published in final edited form as: Med Image Anal. 2007 Mar 30;11(3):315–324. doi: 10.1016/j.media.2007.03.004

Table 1. First five weak classifiers {h₁(x) … h₅(x)} selected for structures, with the feature and scale (or max-min over all scales), weak classifier condition, and alpha value. Mag(κ) refers to $\sqrt{κ_{1}^{2} + κ_{2}^{2} + κ_{3}^{2}}$ .

Airway Classifier			Fissure Classifier			Nodule Classifier			Vessel Classifier

h_i(x)		α_i	h_i(x)		α_i	h_i(x)		α_i	h_i(x)		α_i
κ₂ (max)	> 28.4	2.71	mag(κ) (max)	≤ 32.3	1.65	κ₃ (max)	≤ −24.7	1.86	HU	> −235	2.02
HU	≤ −949	1.54	\|κ₁\|−\|κ₂\|/\|κ₁\|+\|κ₂\| (3.5 mm)	> 0.90	0.84	HU	> −746	1.16	κ₃ (3.5 mm)	> 5.12	1.18
κ₁ (max)	> 30.5	1.16	mag(κ) (max)	≤ 70.9	0.79	κ₃ (max)	> 19.2	0.75	κ₁ (2.4 mm)	≤ −26.6	0.87
κ₂ (max)	≤ 28.3	0.61	κ₁ (1.0 mm)	≤ −11.5	0.93	κ₂ (1.0 mm)	≤ −10.1	0.53	\|κ₃\|/sqrt(\|κ₁κ₂\|) (max)	≤ 0.29	0.85
κ₂ (1.0 mm)	> 57.3	0.75	κ₁ (max)	> 31.1	0.66	mag(κ) (2.4 mm)	≤ 77.3	0.67	κ₁ (max)	≤ 32.2	0.58

Table 1. First five weak classifiers {h1(x) … h5(x)} selected for structures, with the feature and scale (or max-min over all scales), weak classifier condition, and alpha value. Mag(κ) refers to κ12+κ22+κ32.