added phaseCorrelate function by Will Lucas.

samples/cpp/phase_corr.cpp

@@ -0,0 +1,49 @@
+#include "opencv2/core/core.hpp"
+#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/imgproc/imgproc.hpp"
+
+using namespace cv;
+
+int main(int argc, char* argv[])
+{
+    VideoCapture video(0);
+    Mat frame, curr, prev, curr64f, prev64f, hann;
+    int key = 0;
+
+    do
+    {
+        video >> frame;
+        cvtColor(frame, curr, CV_RGB2GRAY);
+
+        if(prev.empty())
+        {
+            prev = curr.clone();
+            createHanningWindow(hann, curr.size(), CV_64F);
+        }
+
+        prev.convertTo(prev64f, CV_64F);
+        curr.convertTo(curr64f, CV_64F);
+
+        Point2d shift = phaseCorrelate(prev64f, curr64f, hann);
+        double radius = cv::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);
+        }
+
+        imshow("phase shift", frame);
+        key = waitKey(2);
+
+        prev = curr.clone();
+    } while((char)key != 27); // Esc to exit...
+
+    return 0;
+}
+
+
+
+