From 31786db5c466c74b4b4bfeb2f9715cccc1e3f45d Mon Sep 17 00:00:00 2001
From: Ivan Shafran <shafran.fun@gmail.com>
Date: Fri, 31 May 2019 23:38:36 +0300
Subject: [PATCH] Change dilate to closing

Dilate increases the document boundary by a few pixels. It is better to use closing or opening which are a sequantial application of dilation and erosion. And therefore document boundary doesn't change their size.
---
 scan.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scan.py b/scan.py
index 1a0daea..9216a17 100644
--- a/scan.py
+++ b/scan.py
@@ -191,7 +191,7 @@ def get_contour(self, rescaled_image):
 
         # dilate helps to remove potential holes between edge segments
         kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(MORPH,MORPH))
-        dilated = cv2.dilate(gray, kernel)
+        dilated = cv2.morphologyEx(gray, cv2.MORPH_CLOSE, kernel)
 
         # find edges and mark them in the output map using the Canny algorithm
         edged = cv2.Canny(dilated, 0, CANNY)