How to find NPCR and UAIC values of an image

How to find NPCR and UAIC values of an image

Answer 1

[Parveiz Lone]

%% 3. NCPR score and UACI values for image data

function [n1 n2 n3 u1 u2 u3]=npcr_uaci(A,B)

[M N C]=size(A);

[M N C]=size(B);

A=uint8(A);

B=uint8(B);

A255=double(A)/double(255);

B255=double(B)/double(255);

D_R=0;

D_G=0;

D_B=0;

%

C_R=0;

C_G=0;

C_B=0;

for i=1:M

for j=1:N

if A(i,j,1)~=B(i,j,1)

D_R=D_R+1;

C_R=C_R+abs(A255(i,j,1)-B255(i,j,1));

% C_R=C_R+abs(double(A(i,j,1))-double(B(i,j,1)))/double(255);%or

end

if A(i,j,2)~=B(i,j,2)

D_G=D_G+1;

C_G=C_G+abs(A255(i,j,2)-B255(i,j,2));

end

if A(i,j,3)~=B(i,j,3)

D_B=D_B+1;

C_B=C_B+abs(A255(i,j,3)-B255(i,j,3));

end

end

end

n1=D_R*100/(M*N);

n2=D_G*100/(M*N);

n3=D_B*100/(M*N);

u1=C_R*100/(M*N);

u2=C_G*100/(M*N);

u3=C_B*100/(M*N);

end