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

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  • How to calculate horizontal and vertical correlation of an image in matlab???
  1 Comment
Hyderkkk
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));

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Answers (3)

elhabib
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));
  3 Comments

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

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

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