v = directionalVariogram(img, xoffset, yoffset); in which version of matlab this function is suported? also in which toolbox?

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vipul utsav 2012-12-24

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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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Answer 1

Wayne King 2012-12-24

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编辑：Wayne King 2012-12-24

在 MATLAB Online 中打开

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