Preserve differentiation in summation from plugin

Author: gselzer

src/main/java/net/imagej/ops/filter/sharpen/DefaultSharpen.java

@@ -14,6 +14,7 @@
 import net.imglib2.algorithm.neighborhood.RectangleNeighborhood;
 import net.imglib2.algorithm.neighborhood.RectangleNeighborhoodFactory;
 import net.imglib2.algorithm.neighborhood.RectangleShape.NeighborhoodsAccessible;
+import net.imglib2.type.numeric.IntegerType;
 import net.imglib2.type.numeric.RealType;
 import net.imglib2.util.Util;
 import net.imglib2.view.Views;
@@ -119,8 +120,15 @@ private void computePlanar(final Position planePos,
 			for (int i = 0; i < kernel.length; i++) {
 				sum += kernel[i] * n[i];
 			}
-
-			double value = sum / scale;
+			
+			//find the value for the output
+			double value;
+			if(type instanceof IntegerType) {
+				value = (sum + scale / 2) / scale;
+			}
+			else {
+				value = sum / scale;
+			}
 
 			outputRA.setPosition(cursor.getLongPosition(0), 0);
 			outputRA.setPosition(cursor.getLongPosition(1), 1);

src/main/java/net/imagej/ops/filter/smooth/DefaultSmooth.java

@@ -14,6 +14,7 @@
 import net.imglib2.algorithm.neighborhood.RectangleNeighborhood;
 import net.imglib2.algorithm.neighborhood.RectangleNeighborhoodFactory;
 import net.imglib2.algorithm.neighborhood.RectangleShape.NeighborhoodsAccessible;
+import net.imglib2.type.numeric.IntegerType;
 import net.imglib2.type.numeric.RealType;
 import net.imglib2.util.Util;
 import net.imglib2.view.Views;
@@ -119,7 +120,14 @@ private void computePlanar(final Position planePos,
 				sum += kernel[i] * n[i];
 			}
 
-			double value = sum / scale;
+			//find the value for the output
+			double value;
+			if(type instanceof IntegerType) {
+				value = (sum + scale / 2) / scale;
+			}
+			else {
+				value = sum / scale;
+			}
 
 			outputRA.setPosition(cursor.getLongPosition(0), 0);
 			outputRA.setPosition(cursor.getLongPosition(1), 1);