How to set or get derivatives of the Gaussian filter?

asked 2014-03-10 21:25:01 -0600

wuling gravatar image

updated 2014-03-10 23:26:55 -0600

Hi all; In opencv document: "Gaussian kernel standard deviation in Y direction; if sigmaY is zero, it is set to be equal to sigmaX, if both sigmas are zeros, they are computed from ksize.width and ksize.height, respectively (see “getGaussianKernel” for details); to fully control the result regardless of possible future modifications of all this semantics, it is recommended to specify all of ksize, sigmaX, and sigmaY."

But if i want:

  1. second derivate along x
  2. second derivate along y
  3. Thrid derivate along x.

............ How to do??? By the way,thanks your help.

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