GRADIENT_OP3D - 3 Dimentional gradient operator

Usage

[dx, dy, dz] = gradient_op3d(I)
[dx, dy, dz] = gradient_op3d(I, wx, wy, wz)

Input parameters

`I`	Input data
`wx`	Weights along x
`wy`	Weights along y
`wz`	Weights along z

Output parameters

`dx`	Gradient along x
`dy`	Gradient along y
`dz`	Gradient along z

Description

Compute the 3-dimentional gradient of I. If the input I has 4 dimentions. This function will compute the gradient of all cubes and return 3 4-dimentionals signals