# How to calculate horizontal and vertical correlation of an image in matlab???

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praveen singhal on 10 Apr 2015
Commented: Ahmed raafat on 22 Oct 2022
• How to calculate horizontal and vertical correlation of an image in matlab???
Hyderkkk on 26 Sep 2021
IA=rgb2gray(im2double(orginal ));
c_diag = corrcoef(IA(1:end-1, 1:end-1), IA(2:end, 2:end));
c_vert = corrcoef(IA(1:end-1, :), IA(2:end, :));
c_horz = corrcoef(IA(:, 1:end-1, :), IA(:, 2:end));
figure;
subplot(3,3,1)
plot(IA(1:end-1, 1:end-1), IA(2:end, 2:end),'b'),title(sprintf('%s Horizontal Orginal image',b));
subplot(3,3,2)
plot(IA(1:end-1, :), IA(2:end, :),'b'),title(sprintf('%s Vertical Orginal image',b));
subplot(3,3,3)
plot(IA(:, 1:end-1, :), IA(:, 2:end),'b'),title(sprintf('%s Diagonal Orginal image',b));
IAA=rgb2gray(im2double(encrption));
c_diage = corrcoef(IAA(1:end-1, 1:end-1), IAA(2:end, 2:end))
c_verte = corrcoef(IAA(1:end-1, :), IAA(2:end, :))
c_horze = corrcoef(IAA(:, 1:end-1, :), IAA(:, 2:end))
subplot(3,3,4)
plot(IAA(1:end-1, 1:end-1), IAA(2:end, 2:end),'r'),title(sprintf('%s Horizontal chiphered image ',b));
subplot(3,3,5)
plot(IAA(1:end-1, :), IA(2:end, :),'r'),title(sprintf('%s Vertical chiphered image',b));
subplot(3,3,6)
plot(IAA(:, 1:end-1, :), IA(:, 2:end),'r'),title(sprintf('%s Diagonal chiphered image',b));

elhabib on 30 Oct 2017
% horizontal function rxy=H_correlation(image1)
P=double(image1);
x1 = double(P(:,1:end-1));
y1 = double(P(:,2:end));
randIndex1 = randperm(numel(x1));
randIndex1 = randIndex1(1:1000);
x = x1(randIndex1);
y = y1(randIndex1);
Ex=(1/(1000))*sum(x);
Ey=(1/(1000))*sum(y);
Dx=(1/(1000))*sum((x(:)-Ex).^2);
Dy=(1/(1000))*sum((y(:)-Ey).^2);
coxy=(1/(1000))*(sum((x-Ex).*(y-Ey)));
rxy=coxy/(sqrt(Dx*Dy));
% vertical
function Vxy=V_correlation(image1)
P=double(image1);
x1 = double(P(1:end-1,:));
y1 = double(P(2:end,:));
randIndex1 = randperm(numel(x1));
randIndex1 = randIndex1(1:1000);
x = x1(randIndex1);
y = y1(randIndex1);
Ex=(1/(1000))*sum(x);
Ey=(1/(1000))*sum(y);
Dx=(1/(1000))*sum((x(:)-Ex).^2);
Dy=(1/(1000))*sum((y(:)-Ey).^2);
coxy=(1/(1000))*(sum((x-Ex).*(y-Ey)));
Vxy=coxy/(sqrt(Dx*Dy));
Ahmed raafat on 22 Oct 2022
Thank you Sir
Thank You Very Very Much

Mahdiyar on 10 Apr 2015
Hi singhal
May you explain more about horizontal and vertical correlation?
Regards,

praveen singhal on 10 Apr 2015
Hello sir, This paper use horizontal,vertical and diagonal correlation of an image.

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