Remove all using directives for STL namespace and members

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

samples/cpp/calibration_artificial.cpp

@@ -150,7 +150,7 @@ int main()
 
 
 ChessBoardGenerator::ChessBoardGenerator(const Size& _patternSize) : sensorWidth(32), sensorHeight(24),
-    squareEdgePointsNum(200), min_cos(sqrt(2.f)*0.5f), cov(0.5),
+    squareEdgePointsNum(200), min_cos(std::sqrt(2.f)*0.5f), cov(0.5),
     patternSize(_patternSize), rendererResolutionMultiplier(4), tvec(Mat::zeros(1, 3, CV_32F))
 {
     Rodrigues(Mat::eye(3, 3, CV_32F), rvec);
@@ -275,7 +275,7 @@ Mat cv::ChessBoardGenerator::generageChessBoard(const Mat& bg, const Mat& camMat
 
 Mat cv::ChessBoardGenerator::operator ()(const Mat& bg, const Mat& camMat, const Mat& distCoeffs, vector<Point2f>& corners) const
 {
-    cov = min(cov, 0.8);
+    cov = std::min(cov, 0.8);
     double fovx, fovy, focalLen;
     Point2d principalPoint;
     double aspect;
@@ -296,7 +296,7 @@ Mat cv::ChessBoardGenerator::operator ()(const Mat& bg, const Mat& camMat, const
     Point3f pb1, pb2;
     generateBasis(pb1, pb2);
 
-    float cbHalfWidth = static_cast<float>(norm(p) * sin( min(fovx, fovy) * 0.5 * CV_PI / 180));
+    float cbHalfWidth = static_cast<float>(norm(p) * sin( std::min(fovx, fovy) * 0.5 * CV_PI / 180));
     float cbHalfHeight = cbHalfWidth * patternSize.height / patternSize.width;
 
     vector<Point3f> pts3d(4);

samples/cpp/distrans.cpp

@@ -3,6 +3,7 @@
 
 #include <stdio.h>
 
+using namespace std;
 using namespace cv;
 
 int maskSize0 = CV_DIST_MASK_5;

samples/cpp/generic_descriptor_match.cpp

@@ -6,6 +6,7 @@
 
 #include <cstdio>
 
+using namespace std;
 using namespace cv;
 
 static void help()

samples/cpp/matcher_simple.cpp

@@ -4,6 +4,7 @@
 #include "opencv2/highgui/highgui.hpp"
 #include "opencv2/nonfree/nonfree.hpp"
 
+using namespace std;
 using namespace cv;
 
 static void help()

samples/cpp/matching_to_many_images.cpp

@@ -57,7 +57,7 @@ static void readTrainFilenames( const string& filename, string& dirName, vector<
 
     size_t pos = filename.rfind('\\');
     char dlmtr = '\\';
-    if (pos == String::npos)
+    if (pos == string::npos)
     {
         pos = filename.rfind('/');
         dlmtr = '/';

samples/cpp/phase_corr.cpp

@@ -25,14 +25,14 @@ int main(int, char* [])
         curr.convertTo(curr64f, CV_64F);
 
         Point2d shift = phaseCorrelate(prev64f, curr64f, hann);
-        double radius = cv::sqrt(shift.x*shift.x + shift.y*shift.y);
+        double radius = std::sqrt(shift.x*shift.x + shift.y*shift.y);
 
         if(radius > 5)
         {
             // draw a circle and line indicating the shift direction...
             Point center(curr.cols >> 1, curr.rows >> 1);
-            cv::circle(frame, center, (int)radius, cv::Scalar(0, 255, 0), 3, CV_AA);
-            cv::line(frame, center, Point(center.x + (int)shift.x, center.y + (int)shift.y), cv::Scalar(0, 255, 0), 3, CV_AA);
+            circle(frame, center, (int)radius, Scalar(0, 255, 0), 3, CV_AA);
+            line(frame, center, Point(center.x + (int)shift.x, center.y + (int)shift.y), Scalar(0, 255, 0), 3, CV_AA);
         }
 
         imshow("phase shift", frame);

samples/cpp/segment_objects.cpp

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <string>
 
+using namespace std;
 using namespace cv;
 
 static void help()

samples/cpp/select3dobj.cpp

@@ -17,6 +17,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+using namespace std;
 using namespace cv;
 
 const char* helphelp =

samples/cpp/tutorial_code/ImgTrans/HoughCircle_Demo.cpp

@@ -9,6 +9,7 @@
 #include <iostream>
 #include <stdio.h>
 
+using namespace std;
 using namespace cv;
 
 /**

samples/cpp/tutorial_code/features2D/SURF_FlannMatcher.cpp

@@ -11,6 +11,7 @@
 #include "opencv2/highgui/highgui.hpp"
 #include "opencv2/nonfree/features2d.hpp"
 
+using namespace std;
 using namespace cv;
 
 void readme();

samples/cpp/tutorial_code/features2D/SURF_Homography.cpp

@@ -12,6 +12,7 @@
 #include "opencv2/calib3d/calib3d.hpp"
 #include "opencv2/nonfree/features2d.hpp"
 
+using namespace std;
 using namespace cv;
 
 void readme();

samples/cpp/tutorial_code/objectDetection/objectDetection.cpp

@@ -18,8 +18,8 @@ void detectAndDisplay( Mat frame );
 
 /** Global variables */
 //-- Note, either copy these two files from opencv/data/haarscascades to your current folder, or change these locations
-String face_cascade_name = "haarcascade_frontalface_alt.xml";
-String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
+string face_cascade_name = "haarcascade_frontalface_alt.xml";
+string eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
 CascadeClassifier face_cascade;
 CascadeClassifier eyes_cascade;
 string window_name = "Capture - Face detection";

samples/cpp/tutorial_code/objectDetection/objectDetection2.cpp

@@ -17,8 +17,8 @@ using namespace cv;
 void detectAndDisplay( Mat frame );
 
 /** Global variables */
-String face_cascade_name = "lbpcascade_frontalface.xml";
-String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
+string face_cascade_name = "lbpcascade_frontalface.xml";
+string eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
 CascadeClassifier face_cascade;
 CascadeClassifier eyes_cascade;
 string window_name = "Capture - Face detection";