From d0870c6d683066be169fb53f831784c50d36e686 Mon Sep 17 00:00:00 2001
From: James Bergstra <james.bergstra@gmail.com>
Date: Fri, 17 Aug 2012 17:55:26 -0400
Subject: [PATCH] ENH: initialize AffineTransform to identity when no args are
 provided

---
 skimage/transform/_geometric.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/skimage/transform/_geometric.py b/skimage/transform/_geometric.py
index 13bcc7f6..51ff9519 100644
--- a/skimage/transform/_geometric.py
+++ b/skimage/transform/_geometric.py
@@ -297,6 +297,11 @@ class AffineTransform(ProjectiveTransform):
                 [                      0,                                 0, 1]
             ])
             self._matrix[0:2, 2] = translation
+        else:
+            # -- Default to an identity transform
+            self._matrix = np.asarray(
+                    [[1, 0, 0], [0, 1, 0], [0, 0, 0]],
+                    dtype='float64')
 
     @property
     def scale(self):