60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#include "opencv2/video/tracking.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include <iostream>
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using namespace cv;
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using namespace std;
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static void help()
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{
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cout <<
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"\nThis program demonstrates dense optical flow algorithm by Gunnar Farneback\n"
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"Mainly the function: calcOpticalFlowFarneback()\n"
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"Call:\n"
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"./fback\n"
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"This reads from video camera 0\n" << endl;
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}
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static void drawOptFlowMap(const Mat& flow, Mat& cflowmap, int step,
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double, const Scalar& color)
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{
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for(int y = 0; y < cflowmap.rows; y += step)
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for(int x = 0; x < cflowmap.cols; x += step)
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{
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const Point2f& fxy = flow.at<Point2f>(y, x);
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line(cflowmap, Point(x,y), Point(cvRound(x+fxy.x), cvRound(y+fxy.y)),
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color);
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circle(cflowmap, Point(x,y), 2, color, -1);
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}
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}
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int main(int, char**)
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{
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VideoCapture cap(0);
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help();
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if( !cap.isOpened() )
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return -1;
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Mat prevgray, gray, flow, cflow, frame;
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namedWindow("flow", 1);
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for(;;)
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{
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cap >> frame;
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cvtColor(frame, gray, COLOR_BGR2GRAY);
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if( prevgray.data )
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{
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calcOpticalFlowFarneback(prevgray, gray, flow, 0.5, 3, 15, 3, 5, 1.2, 0);
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cvtColor(prevgray, cflow, COLOR_GRAY2BGR);
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drawOptFlowMap(flow, cflow, 16, 1.5, Scalar(0, 255, 0));
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imshow("flow", cflow);
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}
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if(waitKey(30)>=0)
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break;
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std::swap(prevgray, gray);
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}
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return 0;
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}
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