GradientOperator:

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   Image gradient operators.
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   Form:
   [dX, dY] = GradientOperator( type )
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   ------
   Inputs
   ------
   type           (1,:)     'roberts' 'sobel' 'prewitt3x3', 'prewitt4x4'

   -------
   Outputs
   -------
   d1             (:,:)     X gradient operator
   d1             (:,:)     Y gradient operator

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