diff --git a/main.cpp b/main.cpp
index dd12c63..e2e6301 100644
--- a/main.cpp
+++ b/main.cpp
@@ -61,7 +61,7 @@ int main( int argc, char** argv )
     //t = (double)cvGetTickCount();
 
     for (int i=0; i<regions.size(); i++)
-      regions[i].er_fill(grey);
+      regions[i].er_fill(grey, mser8.connect8());
 
     //t = cvGetTickCount() - t;
     //cout << "Regions filled in " << t/((double)cvGetTickFrequency()*1000.) << " ms." << endl;
diff --git a/mser.h b/mser.h
index 06ce53b..bf90eb4 100644
--- a/mser.h
+++ b/mser.h
@@ -50,6 +50,9 @@ class MSER
 	/// @param[in] height Height of the image.
 	/// @param[out] regions Detected MSER.
 	void operator()(const uint8_t * bits, int width, int height, std::vector<Region> & regions);
+
+	// return true if use 8-connected, otherwise false.
+	bool connect8(){ return eight_; }
 	
 private:
 	// Helper method
diff --git a/region.cpp b/region.cpp
index 573ceef..d023646 100644
--- a/region.cpp
+++ b/region.cpp
@@ -152,7 +152,7 @@ All rights reserved.
 The function is part of the VLFeat library and is made available under
 the terms of the BSD license (see the COPYING file).
 */
-void Region::er_fill(Mat& _grey_img)
+void Region::er_fill(Mat& _grey_img, bool _eight )
 {
 	const uint8_t *src = (uint8_t*)_grey_img.data;
 	
@@ -254,7 +254,7 @@ void Region::er_fill(Mat& _grey_img)
 	       4 - the pixel has not been visited yet
 	    */
 	    if(good
-	       && nindex != index
+			&& (nindex != index && (_eight || !(nsubs_pt[0] & nsubs_pt[1])))
 	       && ((!invert && I_pt [nindex] <= value) ||
 	           ( invert && I_pt [nindex] >= value))
 	       && ! visited_pt [nindex] ) {
diff --git a/region.h b/region.h
index e5bde03..7256d5b 100644
--- a/region.h
+++ b/region.h
@@ -31,7 +31,7 @@ class Region
 
 	/// Fills an Extremal Region (ER) by region growing from the Index of the initial pixel(pixel_).
 	/// @param[in] grey_img Grey level image
-	void er_fill(cv::Mat& _grey_img);
+	void er_fill(cv::Mat& _grey_img, bool _eight = false);
 
 	std::vector<int> pixels_; ///< list pf all pixels indexes (y * width + x) of the region