Controllo sulle librerie aggiunto.

diff --git a/Filtering/dwt.py b/Filtering/dwt.py
index 3cf2eb0..59df114 100755
--- a/Filtering/dwt.py
+++ b/Filtering/dwt.py
@@ -59,11 +59,19 @@ if __name__ == "__main__":
 LoadingLibrariesStarted()

 # Importing libraries
-import Filtering
-from pylab import show, plot, title, xlabel, ylabel, rcParams
-from numpy import array, sqrt, memmap, roll, inf
-from numpy.linalg import norm
+try:
+    from pylab import show, plot, title, xlabel, ylabel, rcParams
+except ImportError:
+    print "Errore nell'importazione della libreria pylab. Installare python-matplotlib"
+    sys.exit(1)
+try:
+    from numpy import array, sqrt, memmap, roll, inf
+    from numpy.linalg import norm
+except ImportError:
+    print "Errore nell'importazione delle libreria numpy. Installare python-numpy"
+    sys.exit(1)
 import time
+import Filtering

 params = {
     "text.usetex": True,