removeOutliers: added isOnGPU check

functions/imageProcessing/artefactRemoval/removeOutliers.m

@@ -73,8 +73,12 @@ originalImage(isnan(originalImage)) = inf;
 
 % filtered image
 neighbourhood = [settings.neighborhood settings.neighborhood];
-filteredImage = medfilt2(originalImage, neighbourhood, 'symmetric');
-
+if ~isOnGPU(originalImage)
+    filteredImage = medfilt2(originalImage, neighbourhood, 'symmetric');
+else
+    filteredImage = medfilt2(originalImage);
+end
+    
 % difference between original and filtered image
 differenceImage = originalImage - filteredImage;