FindContours with all modes/methods, ticket 303

tests/python/test.py

@@ -461,9 +461,11 @@ class FunctionTests(OpenCVTests):
         storage = cv.CreateMemStorage()
 
         # First run FindContours on a black image.
+        for mode in [cv.CV_RETR_EXTERNAL, cv.CV_RETR_LIST, cv.CV_RETR_CCOMP, cv.CV_RETR_TREE]:
+            for method in [cv.CV_CHAIN_CODE, cv.CV_CHAIN_APPROX_NONE, cv.CV_CHAIN_APPROX_SIMPLE, cv.CV_CHAIN_APPROX_TC89_L1, cv.CV_CHAIN_APPROX_TC89_KCOS, cv.CV_LINK_RUNS]:
                 scratch = cv.CreateImage((800,800), 8, 1)
                 cv.SetZero(scratch)
-        seq = cv.FindContours(scratch, storage, cv.CV_RETR_TREE, cv.CV_CHAIN_APPROX_SIMPLE)
+                seq = cv.FindContours(scratch, storage, mode, method)
                 x = len(seq)
                 if seq:
                     pass