diff --git a/src/main/java/fr/pasteur/ida/zellige/utils/AmplitudeBackgroundForeGroundClassification.java b/src/main/java/fr/pasteur/ida/zellige/utils/AmplitudeBackgroundForeGroundClassification.java
index 42d92821a709e67c0dfca51b845507f3eea3d8e9..f5662990e8e5dd85e39ea068e7f3cfc5ad2b99cc 100644
--- a/src/main/java/fr/pasteur/ida/zellige/utils/AmplitudeBackgroundForeGroundClassification.java
+++ b/src/main/java/fr/pasteur/ida/zellige/utils/AmplitudeBackgroundForeGroundClassification.java
@@ -164,6 +164,21 @@ public class AmplitudeBackgroundForeGroundClassification
             run();
         }
 
+        public static < T extends RealType< T > & NativeType< T > > boolean isForeground( IntervalView< T > intervalView, double sizePercent )
+        {
+            double sum = 0;
+            Cursor< T > cursor = intervalView.cursor();
+            while ( cursor.hasNext() )
+            {
+                cursor.fwd();
+                if ( cursor.get().getRealDouble() != 0 )
+                {
+                    sum++;
+                }
+            }
+            return ( sum ) > ( intervalView.dimension( 0 ) * intervalView.dimension( 1 ) * sizePercent );
+        }
+
         public void run()
         {
             long X = source.dimension( 0 );
@@ -179,22 +194,9 @@ public class AmplitudeBackgroundForeGroundClassification
                 int foreground = isForeground( viewSource, sizePercent ) ? 1 : 0;
                 viewOutput.forEach( pixel -> pixel.setReal( foreground ) );
             }
+            // Slight dilatation in z dimension
+            Utils.gaussConvolution( output.copy(), output, new double[]{ 0, 0, 1 } );
         }
-        public static < T extends RealType< T > & NativeType< T > > boolean isForeground( IntervalView< T > intervalView, double sizePercent )
-        {
-            double sum = 0;
-            Cursor< T > cursor = intervalView.cursor();
-            while ( cursor.hasNext() )
-            {
-                cursor.fwd();
-                if ( cursor.get().getRealDouble() != 0 )
-                {
-                    sum++;
-                }
-            }
-            return ( sum ) > ( intervalView.dimension( 0 ) * intervalView.dimension( 1 ) * sizePercent );
-        }
-
 
         public Img< FloatType > getOutput()
         {