added dual tvl1 optical flow implementation

modules/video/perf/perf_tvl1optflow.cpp

@@ -0,0 +1,33 @@
+#include "perf_precomp.hpp"
+
+using namespace std;
+using namespace cv;
+using namespace perf;
+
+typedef TestBaseWithParam< pair<string, string> > ImagePair;
+
+pair<string, string> impair(const char* im1, const char* im2)
+{
+    return make_pair(string(im1), string(im2));
+}
+
+PERF_TEST_P(ImagePair, OpticalFlowDual_TVL1, testing::Values(impair("cv/optflow/RubberWhale1.png", "cv/optflow/RubberWhale2.png")))
+{
+    declare.time(40);
+
+    Mat frame1 = imread(getDataPath(GetParam().first), IMREAD_GRAYSCALE);
+    Mat frame2 = imread(getDataPath(GetParam().second), IMREAD_GRAYSCALE);
+    ASSERT_FALSE(frame1.empty());
+    ASSERT_FALSE(frame2.empty());
+
+    Mat flow;
+
+    OpticalFlowDual_TVL1 tvl1;
+
+    TEST_CYCLE()
+    {
+        tvl1(frame1, frame2, flow);
+    }
+
+    SANITY_CHECK(flow, 0.5);
+}