Merge pull request #2396 from cudawarped:fix_python_cudawarping_cudaarithm

Add python bindings to cudaobjdetect, cudawarping and cudaarithm

* Overload cudawarping functions to generate correct python bindings.
Add python wrapper to convolution funciton.

* Added shift and hog.

* Moved cuda python tests to this repo and added python bindings to SURF.

* Fix SURF documentation and allow meanshiftsegmention to create GpuMat internaly if not passed for python bindings consistency.

* Add correct cuda SURF test case.

* Fix python mog and mog2 python bindings, add tests and  correct cudawarping documentation.

* Updated KeyPoints in cuda::ORB::Convert python wrapper to be an output argument.

* Add changes suggested by alalek

* Added changes suggested by asmorkalov

modules/cudaobjdetect/misc/python/test/test_cudaobjdetect.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+import os
+import cv2 as cv
+import numpy as np
+
+from tests_common import NewOpenCVTests, unittest
+
+class cudaobjdetect_test(NewOpenCVTests):
+    def setUp(self):
+        super(cudaobjdetect_test, self).setUp()
+        if not cv.cuda.getCudaEnabledDeviceCount():
+            self.skipTest("No CUDA-capable device is detected")
+
+    @unittest.skipIf('OPENCV_TEST_DATA_PATH' not in os.environ,
+                        "OPENCV_TEST_DATA_PATH is not defined")
+    def test_hog(self):
+        img_path = os.environ['OPENCV_TEST_DATA_PATH'] + '/gpu/caltech/image_00000009_0.png'
+        npMat = cv.cvtColor(cv.imread(img_path),cv.COLOR_BGR2BGRA)
+
+        cuMat = cv.cuda_GpuMat(npMat)
+        cuHog = cv.cuda.HOG_create()
+        cuHog.setSVMDetector(cuHog.getDefaultPeopleDetector())
+
+        loc, conf = cuHog.detect(cuMat)
+        self.assertTrue(len(loc) == len(conf) and len(loc) > 0 and len(loc[0]) == 2)
+
+        loc = cuHog.detectWithoutConf(cuMat)
+        self.assertTrue(len(loc) > 0 and len(loc[0]) == 2)
+
+        loc = cuHog.detectMultiScaleWithoutConf(cuMat)
+        self.assertTrue(len(loc) > 0 and len(loc[0]) == 4)
+
+        cuHog.setGroupThreshold(0)
+        loc, conf = cuHog.detectMultiScale(cuMat)
+        self.assertTrue(len(loc) == len(conf) and len(loc) > 0 and len(loc[0]) == 4)
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()