fixed warnings and errors reported by VS2010

samples/cpp/brief_match_test.cpp

@@ -44,7 +44,7 @@ void matches2points(const vector<DMatch>& matches, const vector<KeyPoint>& kpts_
 
 }
 
-float match(const vector<KeyPoint>& kpts_train, const vector<KeyPoint>& kpts_query, DescriptorMatcher& matcher,
+double match(const vector<KeyPoint>& kpts_train, const vector<KeyPoint>& kpts_query, DescriptorMatcher& matcher,
             const Mat& train, const Mat& query, vector<DMatch>& matches)
 {
 
@@ -112,7 +112,7 @@ int main(int ac, char ** av)
   cout << "matching with BruteForceMatcher<Hamming>" << endl;
   BruteForceMatcher<Hamming> matcher_popcount;
   vector<DMatch> matches_popcount;
-  float pop_time = match(kpts_1, kpts_2, matcher_popcount, desc_1, desc_2, matches_popcount);
+  double pop_time = match(kpts_1, kpts_2, matcher_popcount, desc_1, desc_2, matches_popcount);
   cout << "done BruteForceMatcher<Hamming> matching. took " << pop_time << " seconds" << endl;
 
   vector<Point2f> mpts_1, mpts_2;

samples/cpp/build3dmodel.cpp

@@ -371,7 +371,7 @@ struct EqKeypoints
 
 static void build3dmodel( const Ptr<FeatureDetector>& detector,
                           const Ptr<DescriptorExtractor>& descriptorExtractor,
-                          const vector<Point3f>& modelBox,
+                          const vector<Point3f>& /*modelBox*/,
                           const vector<string>& imageList,
                           const vector<Rect>& roiList,
                           const vector<Vec6f>& poseList,

samples/cpp/contours2.cpp

@@ -33,7 +33,7 @@ void on_trackbar(int, void*)
     imshow("contours", cnt_img);
 }
 
-int main( int argc, char** argv)
+int main( int argc, char**)
 {
     Mat img = Mat::zeros(w, w, CV_8UC1);
     if(argc > 1)

samples/cpp/starter_video.cpp

@@ -35,7 +35,7 @@ int process(VideoCapture& capture) {
 		if (frame.empty())
 			continue;
 		imshow(window_name, frame);
-		char key = waitKey(5); //delay N millis, usually long enough to display and capture input
+		char key = (char)waitKey(5); //delay N millis, usually long enough to display and capture input
 		switch (key) {
 		case 'q':
 		case 'Q':