diff --git a/src/featureTracking.cpp b/src/featureTracking.cpp
index a77012a..80f45db 100644
--- a/src/featureTracking.cpp
+++ b/src/featureTracking.cpp
@@ -31,19 +31,19 @@ CvMat dMat = cvMat(4, 1, CV_64FC1, dImage);
 
 IplImage *mapx, *mapy;
 
-const int maxFeatureNumPerSubregion = 20;
-const int xSubregionNum = 6;
-const int ySubregionNum = 4;
+const int maxFeatureNumPerSubregion = 2;
+const int xSubregionNum = 12;
+const int ySubregionNum = 8;
 const int totalSubregionNum = xSubregionNum * ySubregionNum;
 const int MAXFEATURENUM = maxFeatureNumPerSubregion * totalSubregionNum;
 
-const int xBoundary = 30;
-const int yBoundary = 30;
+const int xBoundary = 20;
+const int yBoundary = 20;
 const double subregionWidth = (double)(imageWidth - 2 * xBoundary) / (double)xSubregionNum;
 const double subregionHeight = (double)(imageHeight - 2 * yBoundary) / (double)ySubregionNum;
 
 const double maxTrackDis = 100;
-const int winSize = 21;
+const int winSize = 15;
 
 IplImage *imageEig, *imageTmp, *pyrCur, *pyrLast;