diff --git a/OpenCV/C++/sift_tracker.cpp b/OpenCV/C++/sift_tracker.cpp
index 0580827..2f67d30 100644
--- a/OpenCV/C++/sift_tracker.cpp
+++ b/OpenCV/C++/sift_tracker.cpp
@@ -245,9 +245,18 @@ void newPoints(vector<double> diff, Point cen, double rad)
 {
     printf("rad = %lf\tcen=(%d, %d)\n",rad, cen.x, cen.y);
     printf("%f %f %f %f\n",diff[0], diff[1], diff[2], diff[3]);
-    point1.x = cen.x - rad - diff[0];
-    point1.y = cen.y - rad - diff[1];
-    point2.x = cen.x + rad + diff[2];
-    point2.y = cen.y + rad + diff[3];
+    
+    point1.x = cen.x - rad - diff[0] >= 0 ? cen.x - rad - diff[0]:0; 
+    point1.x = cen.x - rad - diff[0] <= img.cols ? cen.x - rad - diff[0]:img.cols;
+    
+    point1.y = cen.y - rad - diff[1] >= 0 ? cen.y - rad - diff[1]:0;
+    point1.y = cen.y - rad - diff[1] <= img.rows ? cen.y - rad - diff[1]:img.rows;
+    
+    point2.x = cen.x + rad + diff[2] >= 0 ? cen.x + rad + diff[2]:0;
+    point2.x = cen.x + rad + diff[2] <= img.cols ? cen.x + rad + diff[2]:img.cols;
+    
+    point2.y = cen.y + rad + diff[3] >= 0 ? cen.y + rad + diff[3]:0;
+    point2.y = cen.y + rad + diff[3] <= img.rows ? cen.y + rad + diff[3]:img.rows;
+    
     printf("(%d, %d), (%d, %d)\n", point1.x, point1.y, point2.x, point2.y);
 }