v = directionalVariogram(img, xoffset, yoffset); in which version of matlab this function is suported? also in which toolbox?
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v = directionalVariogram(img, xoffset, yoffset);
in which version of matlab this function is suported?
also in which toolbox?
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Accepted Answer
Wayne King
on 24 Dec 2012
Edited: Wayne King
on 24 Dec 2012
This is not a MathWorks' function. It was a function written and posted by Daniel Young as far as I can tell
function v = directionalVariogram(img, xoffset, yoffset)
%directionalVariogram computes empirical direction variogram
% v = directionalVariogram(img, xoffset, yoffset) takes a 2D image array
% and offsets in the x and y directions. It returns the mean of the
% squared differences between pairs of pixels in the image such that the
% spatial offsets between the pixels are as specified.
if xoffset < 0 % difference is symmetric so can force xoffset positive
xoffset = -xoffset;
yoffset = -yoffset;
end
% make offset and trimmed copies of image
if yoffset > 0
imga = img(1+yoffset:end, 1+xoffset:end);
imgb = img(1:end-yoffset, 1:end-xoffset);
else
imga = img(1:end+yoffset, 1+xoffset:end);
imgb = img(1-yoffset:end, 1:end-xoffset);
end
d = imga - imgb;
v = mean(d(:).^2);
end
To see Daniel's original answer:
3 Comments
Wayne King
on 24 Dec 2012
That is also not a MathWorks' function, but perhaps you are talking about this?
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