颜色特征提取matlab

%% I. 清空环境变量 clear all clc I=imread('lena.jpg'); firstMoment = mean(mean(I)); % 一阶颜色矩 difference = I(:,:,m) - firstMoment(1,1,m); %差分颜色矩 secondMoment(m,1) = sqrt(mean(mean(difference.*difference))); % 二阶颜色矩 thirdMoment(m,1) = nthroot(mean(mean(difference.*difference.*difference)),3); % 三阶颜色矩