From 4f621493e5a46ca4ecbe997cb09d1de7d7d95db4 Mon Sep 17 00:00:00 2001
From: Andrey Golovizin <ag@sologoc.com>
Date: Mon, 25 Aug 2014 15:30:10 +0200
Subject: [PATCH] Line.baseline: fix detecting baselines at image boundaries.

---
 pixelocr/page.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pixelocr/page.py b/pixelocr/page.py
index 6064fe1..fbf2cb5 100644
--- a/pixelocr/page.py
+++ b/pixelocr/page.py
@@ -101,9 +101,11 @@ class Line(PageObject):
         """Detect baseline height, relative to the top."""
         bitmap = self.image.bitmap.astype(np.float)
         histogram = bitmap.sum(axis=1)
-        gradient = filters.correlate1d(histogram, [-1, 1], axis=0)
+        gradient = list(filters.correlate1d(histogram, [-1, 1], axis=0, mode='constant'))
+        gradient[0] = histogram[0]
+        gradient.append(-histogram[-1])
         # top = gradient.argmax()
-        bottom = gradient.argmin()
+        bottom = np.argmin(gradient)
         return self.y + bottom
 
     @property