如何使用matlab计算图像中像素的垂直和水平相关性？ [英] How do I calculate the vertical and horizontal correlation of pixels in an image using matlab?

问题描述

我想计算加密图像的像素相关性（对于垂直和水平像素对）。我知道corr并将其用作

RHO = corr（X）



但它将相关性作为相关矩阵给出（i想想每个像素，它显示出不同的相关性）但我想要整个图像的一个相关性来比较一些加密图像，通过不同的算法加密。



< b>我尝试了什么：



i尝试过 -

RHO = corr（图片）

和

corr2（图片）;

但它不起作用。

I want to calculate the correlation of pixels of an encrypted image (for a vertical and horizontal pair of pixels). i know about the corr and used it as
RHO = corr(X)

but it's giving correlation as a matrix of correlations (i think for each and every pixel, it is showing different correlation) but i want one correlation for the whole image to compare some encrypted images, encrypted by different algorithms.

What I have tried:

i tried -
RHO = corr(image)
and
corr2(image);
but it's not working.

推荐答案

我的朋友Ali B.说...这样：



函数r_xy = AdjancyCorrPixel（P）

x1 = double（P（：，1：end-） 1））;

y1 = double（P（：，2：end））;

randIndex1 = randperm（numel（x1））;

randIndex1 = randIndex1（1：3000）;

x = x1（randIndex1）;

y = y1（randIndex1）;

r_xy = corrcoef（x，y）;

scatter（x，y）;

xlabel（'位置上的像素灰度值（x，y）'）

ylabel（'位置上的像素灰度值（x + 1，y）'）

结束



（

复制和粘贴自：
MATLAB Central [ ^ ]

）

My friend Ali B. says ... this way:

function r_xy=AdjancyCorrPixel( P )
x1 = double(P(:,1:end-1));
y1 = double(P(:,2:end));
randIndex1 = randperm(numel(x1));
randIndex1 = randIndex1(1:3000);
x = x1(randIndex1);
y = y1(randIndex1);
r_xy = corrcoef(x,y);
scatter(x,y);
xlabel('Pixel gray value on location (x,y)')
ylabel('Pixel gray value on location (x+1,y)')
end

(
copied & pasted from:
MATLAB Central[^]
)

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