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

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praveen singhal 2015-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/197131-how-to-calculate-horizontal-and-vertical-correlation-of-an-image-in-matlab

评论： Ahmed raafat 2022-10-22

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

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Hyderkkk 2021-9-26

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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Answer 1

elhabib 2017-10-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/197131-how-to-calculate-horizontal-and-vertical-correlation-of-an-image-in-matlab#answer_288454

在 MATLAB Online 中打开

% 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));