improc ass4: Source code cleanup.

improc/ass4/canny.py

@@ -17,9 +17,9 @@ def canny(F, s, Tl=None, Th=None):
     F = gD(F, s, 0, 0)
 
     # Find intensity gradient
-    mask = Gauss1(1.4, 1)
-    Gx = convolve1d(F, mask, axis=1, mode='nearest')
-    Gy = convolve1d(F, mask, axis=0, mode='nearest')
+    W = Gauss1(1.4, 1)
+    Gx = convolve1d(F, W, axis=1, mode='nearest')
+    Gy = convolve1d(F, W, axis=0, mode='nearest')
     G = zeros(F.shape)
     A = zeros(F.shape, dtype=int)