From d7eb2dc9eb5f391a6a6742bea3692c8ab1d8aa69 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20Sch=C3=B6nberger?= <jschoenberger@demuc.de>
Date: Sat, 27 Apr 2013 16:08:00 +0200
Subject: [PATCH] Add short description to edge filter example

---
 doc/examples/plot_edge_filter.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/examples/plot_edge_filter.py b/doc/examples/plot_edge_filter.py
index afadddf7..2538ec71 100644
--- a/doc/examples/plot_edge_filter.py
+++ b/doc/examples/plot_edge_filter.py
@@ -1,3 +1,13 @@
+"""
+==============
+Edge operators
+==============
+
+Edge operators are used in image processing within edge detection algorithms.
+They are discrete differentiation operators, computing an approximation of the
+gradient of the image intensity function.
+
+"""
 import matplotlib.pyplot as plt
 
 from skimage.data import camera