Computes the magnitude of the gradient of an image by convolution with the first derivative of a Gaussian.

## Inputs

#### Image

An image.

Type: Image4DFloat, Required, Single

## Outputs

#### Output

An image with the same size as the input image, where the voxel values represent the gaussian gradient magnitude.

Type: Image4DFloat

## Settings

#### Sigma Number

Set Sigma value. Sigma is measured in the units of image spacing.