From 02bf7130172655a4beaf3129fd3c2715eb37d77f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20Sch=C3=B6nberger?= <hannesschoenberger@gmail.com>
Date: Wed, 15 Aug 2012 09:08:20 +0200
Subject: [PATCH] add some more comments to subdivision of polygons code

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

diff --git a/skimage/measure/_polygon.py b/skimage/measure/_polygon.py
index 2d938af7..c1eaa9d5 100644
--- a/skimage/measure/_polygon.py
+++ b/skimage/measure/_polygon.py
@@ -136,10 +136,13 @@ def subdivide_polygon(coords, degree=2):
 
     method = 'valid'
     if circular:
+        # remove last coordinate because of wrapping
         coords = coords[:-1, :]
+        # circular convolution by wrapping boundaries
         method = 'same'
 
     mask_even, mask_odd = SUBDIVISION_DEGREES[degree]
+    # divide by total weight
     mask_even = np.array(mask_even, 'float') / 2 ** degree
     mask_odd = np.array(mask_odd, 'float') / 2 ** degree