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