Fig. 3

BOA cascade. Classification process with BOA classification cascade. At each stage s of the cascade new target likelihood score f_s(x)=l_s is computed and either classification is made, or next stage is entered. The internal Boolean decision makers \(B_{1}^{1}\), \(B_{2}^{1}\), …, \(B_{S}^{1}\) are partitions of BOA function (7), and \(B_{1}^{0}\), \(B_{2}^{0}\), …, \(B_{S}^{0}\) are partitions of (8)