From fe2e214385146ef93621698bf6475d8be6e0f51a Mon Sep 17 00:00:00 2001
From: Ankit Agrawal <aaaagrawal@iitb.ac.in>
Date: Fri, 6 Sep 2013 02:49:37 +0530
Subject: [PATCH] Adding example in descriptor_orb

---
 skimage/feature/orb.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/skimage/feature/orb.py b/skimage/feature/orb.py
index 81bf4867..09ed18ab 100644
--- a/skimage/feature/orb.py
+++ b/skimage/feature/orb.py
@@ -138,6 +138,21 @@ def descriptor_orb(image, keypoints, orientations, scales,
           "ORB : An efficient alternative to SIFT and SURF"
           http://www.vision.cs.chubu.ac.jp/CV-R/pdf/Rublee_iccv2011.pdf
 
+    Examples
+    --------
+    >>> from skimage.data import lena
+    >>> from skimage.color import rgb2gray
+    >>> from skimage.feature import keypoints_orb, descriptor_orb
+    >>> img = rgb2gray(lena())
+    >>> keypoints, orientations, scales = keypoints_orb(img, n_keypoints=250)
+    >>> keypoints.shape
+    (250, 2)
+    >>> descriptors, filtered_keypoints = descriptor_orb(img, keypoints, orientations, scales)
+    >>> filtered_keypoints.shape
+    (246, 2)
+    >>> descriptors.shape
+    (246, 256)
+
     """
     image = np.squeeze(image)
     if image.ndim != 2: