BUG: Hough failed on provision of angles argument.

scikits/image/transform/hough_transform.py

@@ -1,4 +1,4 @@
-## Copyright (C) 2006 Stefan van der Walt <stefan@sun.ac.za>
+## Copyright (C) 2005 Stefan van der Walt <stefan@sun.ac.za>
 ##
 ## Redistribution and use in source and binary forms, with or without
 ## modification, are permitted provided that the following conditions are
@@ -78,7 +78,7 @@ def hough(img, angles=None):
 
     img = img.astype(bool)
 
-    if not angles:
+    if angles is None:
         angles = np.linspace(-90,90,180)
 
     theta = angles / 180. * np.pi

scikits/image/transform/tests/test_hough_transform.py

@@ -16,3 +16,15 @@ def test_hough():
 
     assert_equal(out.max(), 100)
     assert_equal(len(angles), 180)
+
+def test_hough_angles():
+    img = np.zeros((10, 10))
+    img[0, 0] = 1
+
+    out, angles, d = hough(img, np.linspace(0, 360, 10))
+
+    assert_equal(len(angles), 10)
+
+if __name__ == "__main__":
+    run_module_suite()
+