Added forward and inverse 2-D Finite Radon Transform

scikits/image/transform/tests/test_finite_radon_transform.py

@@ -0,0 +1,18 @@
+import numpy as np
+from numpy.testing import *
+
+from scikits.image.transform import *
+
+def test_frt():
+    SIZE = 59
+    try:
+        import sympy.ntheory as sn
+        assert sn.isprime(SIZE) == True
+    except ImportError:
+        sn = False
+
+    # Generate a test image
+    L = np.tri(SIZE, dtype=np.int32) + np.tri(SIZE, dtype=np.int32)[::-1]
+    f = frt2(L)
+    fi = ifrt2(f)
+    assert len(np.nonzero(L-fi)[0]) == 0