How can we plot the correlation

How can we plot the correlation between pixels in two images, the first clear and the other containing noise, or correlation between the samples in two sound signals?

Is there a tool in Matlab or a function that achieves this purpose?

Answer 1

[Bjorn Gustavsson]

It seems that you ask for the corrcoef. If you look at the correlation between 2 signals you will simly get a 2-by-2 matrix which seems to be a bit small to plot as an image, but you can do something like this (for your 2 images case);

corrI1I2 = corrcoef([I1(:),I2(:)]);
imagesc(corrI1I2)

Or possibly:

plotmatrix([I1(:),I2(:)])

HTH

[reta jon]

thank you sir

i ask about Correlation between the samples in original audio file and encrypted audio file.

[Bjorn Gustavsson]

Well if you have 2 time-series (audio1 and audio2) you still get one 2-by-2 matrix with the correlation-coefficients, so the above suggestion should still work.

[reta jon]

thank you sir

[Bjorn Gustavsson]

My pleasure.