47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#include "opencv2/core/core.hpp"
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#include "opencv2/videoio/videoio.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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using namespace cv;
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int main(int, char* [])
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{
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VideoCapture video(0);
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Mat frame, curr, prev, curr64f, prev64f, hann;
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int key = 0;
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do
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{
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video >> frame;
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cvtColor(frame, curr, COLOR_RGB2GRAY);
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if(prev.empty())
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{
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prev = curr.clone();
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createHanningWindow(hann, curr.size(), CV_64F);
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}
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prev.convertTo(prev64f, CV_64F);
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curr.convertTo(curr64f, CV_64F);
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Point2d shift = phaseCorrelate(prev64f, curr64f, hann);
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double radius = std::sqrt(shift.x*shift.x + shift.y*shift.y);
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if(radius > 5)
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{
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// draw a circle and line indicating the shift direction...
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Point center(curr.cols >> 1, curr.rows >> 1);
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circle(frame, center, (int)radius, Scalar(0, 255, 0), 3, LINE_AA);
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line(frame, center, Point(center.x + (int)shift.x, center.y + (int)shift.y), Scalar(0, 255, 0), 3, LINE_AA);
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}
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imshow("phase shift", frame);
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key = waitKey(2);
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prev = curr.clone();
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} while((char)key != 27); // Esc to exit...
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return 0;
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}
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