diff --git a/descriptors/dfc_base.py b/descriptors/dfc_base.py
index dede241..da83012 100644
--- a/descriptors/dfc_base.py
+++ b/descriptors/dfc_base.py
@@ -9,26 +9,31 @@
 # TODO details
 
 import numpy as np
-
-import sys
-sys.path.append('..')
 import ld2dap
 
 def run(rasters, treshold=1e4):
+    """DFC base, aka no local description before learning.
+
+    Simply stack layers as description vectors.
+
+    """
     # Parse parameters type
     treshold = float(treshold)
 
     # Pipelines
     loader = ld2dap.LoadTIFF(rasters)
     dfc_filter = ld2dap.Treshold(treshold)
+    normalize = ld2dap.Normalize(dtype=np.uint8)
+    raw_out = ld2dap.RawOutput()
+
+    raw_out.input = normalize
+    normalize.input = dfc_filter
     dfc_filter.input = loader
-    out_vectors = ld2dap.RawOutput()
-    out_vectors.input = dfc_filter
 
     # Compute vectors
-    out_vectors.run()
+    raw_out.run()
 
-    return out_vectors.data
+    return raw_out.data
 
 def version():
     return 'v0.0'