How to use code of chi square test to check histogram analyis

How to use code of chi square test to check histogram analyis

Answer 1

[Parveiz Lone]

%% chi square test for image data

function [X_R X_G X_B]=chisquare(C)

B1=uint8(C); % C=cipher image

v=0;

a1=imhist(B1(:,:,1));

a2=imhist(B1(:,:,2));

a3=imhist(B1(:,:,3));

for i=1:256

z1=((a1(i)-256).^2)/256;

v=v+z1;

end

z2=((a2-256).^2)/256;

z3=((a3-256).^2)/256;

X_R=v;

X_G=sum(z2);

X_B=sum(z3);

end