ImageDerivative:

Path: Imaging/ImageMatching

% Generate an image derivative. 
 The default it the mask a = [1 2 1;0 0 0;-1 -2 -1]/8 (Sobel)
 but any mask can be input.

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   Form:
       ImageDerivative;
       ImageDerivative( i );
   d = ImageDerivative( i, a )
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   ------
   Inputs
   ------
   i              (n,m)     Grayscale image (double)
   a              (:,:)     Kernel

   -------
   Outputs
   -------
   d              (n,m)     Derivative

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Children:

Common: Graphics/ColorMapGrayScale
Imaging: ImageData/SCImage
Imaging: ImageProcessing/Imager
Imaging: Utilities/ReadImage

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