G'MIC - GREYC's Magic for Image Computing: A Full-Featured Open-Source Framework for Image Processing

Reference

Table of Contents ▸ List of Commands ▸ Filtering ▸ gradient

◀ fft | gradient_norm ▶

gradient

Arguments:

{ x | y | z | c }...{ x | y | z | c },_scheme,_boundary_conditions or
(no arg)

Description:

Compute the gradient components (first derivatives) of selected images, along specified axes.

(equivalent to shortcut command g).

scheme can be { -1:Backward | 0:Centered | 1:Forward | 2:Sobel | 3:Rotation-invariant (default) | 4:Deriche | 5:Vanvliet | 6:FB-Maxabs }.
boundary_conditions can be { 0:Dirichlet | 1:Neumann | 2:Periodic | 3:Mirror }.
(no arg) compute all significant components.

Default values:

scheme=0 and boundary_conditions=1.

This command has a tutorial page.

Example of use:

<a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> gradient

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> gradient

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> gradient

G'MIC - GREYC's Magic for Image Computing: A Full-Featured Open-Source Framework for Image Processing

G'MIC is an open-source software distributed under the CeCILL free software licenses (LGPL-like and/or
GPL-compatible). Copyrights (C) Since July 2008, David Tschumperlé - GREYC UMR CNRS 6072, Image Team.