Second-Order Difference

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Bruno Bertini
Bruno Bertini 2011-9-23
How can I find the Second-Order Difference signals in diagonal and minor diagonal of a matrix? The matrix is an image. For the horizontal and vertical I suppose this:
Dh = diff(image, 2);
Dv = diff(Image, 2 ,2);
Thanks!

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回答（1 个）

bym
bym 2011-9-24
m = magic(4)
Dd = diff(diag(m),2) %diagonal
Dm = diff(diag(rot90(m)),2) %minor diagonal
  2 个评论
Bruno Bertini
Bruno Bertini 2011-9-24
Thank you very much!
Dh and Dv are correct?
I have to use the Second-Order Difference signals for an image.
bym
bym 2011-9-24
Dh and Dv look correct. I have edited Dm to add the 2 ;)

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