diff --git a/20Tracking/@TrackBlobs/TrackBlobs.m b/20Tracking/@TrackBlobs/TrackBlobs.m
index 4b166d9..c793bcd 100644
--- a/20Tracking/@TrackBlobs/TrackBlobs.m
+++ b/20Tracking/@TrackBlobs/TrackBlobs.m
@@ -20,6 +20,7 @@
         timeSearchScope = 15;
         searchRadius = 10;
         areaThreshold = 5;
+        steadyCriteria = 6;
         videoName = [];
     end
     
diff --git a/20Tracking/@TrackBlobs/dbCleanUp.m b/20Tracking/@TrackBlobs/dbCleanUp.m
new file mode 100644
index 0000000..f6d9956
--- /dev/null
+++ b/20Tracking/@TrackBlobs/dbCleanUp.m
@@ -0,0 +1,36 @@
+function dbCleanUp(obj)
+    cleanUpOnlyOneAppearance(obj);
+    cleanUpSteady(obj);
+end
+
+function cleanUpOnlyOneAppearance(obj)
+    ndb = length(obj.DB);
+    keepIndex = true(ndb, 1);
+    for i = 1 : ndb
+        if length(obj.DB{i}.timeIDX) == 1
+            keepIndex(i) = false;
+        end
+    end
+    obj.DB = obj.DB(keepIndex);
+end
+
+function cleanUpSteady(obj)
+    ndb = length(obj.DB);
+    keepIndex = true(ndb, 1);
+    for i = 1 : ndb
+        isSteady = checkIsSteady(obj, i);
+        if isSteady == 1
+            keepIndex(i) = false;
+        end
+    end
+    obj.DB = obj.DB(keepIndex);
+end
+
+function isSteady = checkIsSteady(obj, i)
+    tmpEntry = obj.DB{i};
+    tmpStd = std(tmpEntry.Centroid);
+    isSteady = 0;
+    if all(tmpStd < obj.steadyCriteria)
+        isSteady = 1;
+    end
+end
\ No newline at end of file
diff --git a/20Tracking/@TrackBlobs/playTrackingBlobs.m b/20Tracking/@TrackBlobs/playTrackingBlobs.m
index 9bd74dd..e7fc8ee 100644
--- a/20Tracking/@TrackBlobs/playTrackingBlobs.m
+++ b/20Tracking/@TrackBlobs/playTrackingBlobs.m
@@ -6,6 +6,7 @@ function playTrackingBlobs(obj)
 rectShow = figure;
 for t = 1 : obj.fg.nFrame
     I = uint8(obj.fg.Data(:, :, t));
+    I = I > 0.01;
     imshow(I, 'border', 'tight');
     for j = 1 : length(obj.DBbyFrame{t})
         tBlob = obj.DBbyFrame{t}(j);        
diff --git a/20Tracking/@TrackBlobs/saveTrackingBlobs.m b/20Tracking/@TrackBlobs/saveTrackingBlobs.m
index 3dea465..09dad14 100644
--- a/20Tracking/@TrackBlobs/saveTrackingBlobs.m
+++ b/20Tracking/@TrackBlobs/saveTrackingBlobs.m
@@ -9,6 +9,7 @@ function saveTrackingBlobs( obj )
 
     for t = 1 : obj.fg.nFrame
         I = uint8(obj.fg.Data(:, :, t));
+        I = I > 0.01;
         imshow(I, 'border', 'tight');
         for j = 1 : length(obj.DBbyFrame{t})
             tBlob = obj.DBbyFrame{t}(j);        
diff --git a/main_class.m b/main_class.m
index f68d4e3..e4d1bcf 100644
--- a/main_class.m
+++ b/main_class.m
@@ -27,7 +27,7 @@
 end
 combinedImagePath = '/Users/herbert19lee/Documents/MATLAB/work/celltrack/Results/vivo/combinedImage';
 [datapath videoName n] = rfdatabase(datapath, [], '.mat');
-for i = 4
+for i = 11
     idName = videoName{i}(7 : end - 4);
     display([idName 'i = ' num2str(i)]);
     load(fullfile(datapath, videoName{i}));
@@ -45,6 +45,7 @@
     trackBlobsObj.DBMergeLocation();
     % TODO Dynamics
     trackBlobsObj.DBMergeDynamics();
+    trackBlobsObj.dbCleanUp();
     trackBlobsObj.DBSortByFrame();
     trackBlobsObj.playTrackingBlobs();
     trackBlobsObj.videoName = ['video' idName '_trial1.avi'];