From 9317b7be346472f49706781685472dd68a65fbbc Mon Sep 17 00:00:00 2001
From: Juan Nunez-Iglesias <juan.n@unimelb.edu.au>
Date: Thu, 3 Sep 2015 20:15:29 +0200
Subject: [PATCH] Make area a cached property; use np.sum

---
 skimage/measure/_regionprops.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/skimage/measure/_regionprops.py b/skimage/measure/_regionprops.py
index a130601b..297515cb 100644
--- a/skimage/measure/_regionprops.py
+++ b/skimage/measure/_regionprops.py
@@ -106,8 +106,9 @@ class _RegionProperties(object):
         self._cache = {}
         self._ndim = label_image.ndim
 
+    @_cached_property
     def area(self):
-        return self.image.sum()
+        return np.sum(self.image)
 
     def bbox(self):
         return tuple([self._slice[i].start for i in range(self._ndim)] +