www.gusucode.com > classification_matlab_toolbox分类方法工具箱源码程序 > code/Classification_toolbox/Bhattacharyya.m
function Perror = Bhattacharyya(mu1, sigma1, mu2, sigma2, p1) % Find the Bhattacharyya bound given means and covariances of single gaussian distributions % Inputs: % mu1 - Mean for class 1 % sigma1 - Covariance matrix for class 1 % mu2 - Mean for class 2 % sigma2 - Covariance matrix for class 2 % p1 - Probability of class 1 % % Outputs % Perror - Error bound k_half = 1/8*(mu2-mu1)*inv((sigma1+sigma2)/2)*(mu2-mu1)'+1/2*log(det((sigma1+sigma2)/2)/sqrt(det(sigma1)*det(sigma2))); Perror = sqrt(p1*(1-p1))*exp(-k_half);