150 lines
3.9 KiB
C++
150 lines
3.9 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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#include <ctype.h>
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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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// print a welcome message, and the OpenCV version
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cout << "\nThis is a demo of Lukas-Kanade optical flow lkdemo(),\n"
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"Using OpenCV version " << CV_VERSION << endl;
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cout << "\nIt uses camera by default, but you can provide a path to video as an argument.\n";
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cout << "\nHot keys: \n"
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"\tESC - quit the program\n"
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"\tr - auto-initialize tracking\n"
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"\tc - delete all the points\n"
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"\tn - switch the \"night\" mode on/off\n"
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"To add/remove a feature point click it\n" << endl;
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}
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Point2f point;
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bool addRemovePt = false;
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static void onMouse( int event, int x, int y, int /*flags*/, void* /*param*/ )
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{
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if( event == CV_EVENT_LBUTTONDOWN )
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{
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point = Point2f((float)x, (float)y);
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addRemovePt = true;
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}
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}
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int main( int argc, char** argv )
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{
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help();
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VideoCapture cap;
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TermCriteria termcrit(CV_TERMCRIT_ITER|CV_TERMCRIT_EPS, 20, 0.03);
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Size subPixWinSize(10,10), winSize(31,31);
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const int MAX_COUNT = 500;
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bool needToInit = false;
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bool nightMode = false;
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if( argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
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cap.open(argc == 2 ? argv[1][0] - '0' : 0);
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else if( argc == 2 )
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cap.open(argv[1]);
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if( !cap.isOpened() )
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{
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cout << "Could not initialize capturing...\n";
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return 0;
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}
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namedWindow( "LK Demo", 1 );
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setMouseCallback( "LK Demo", onMouse, 0 );
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Mat gray, prevGray, image;
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vector<Point2f> points[2];
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for(;;)
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{
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Mat frame;
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cap >> frame;
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if( frame.empty() )
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break;
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frame.copyTo(image);
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cvtColor(image, gray, CV_BGR2GRAY);
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if( nightMode )
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image = Scalar::all(0);
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if( needToInit )
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{
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// automatic initialization
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goodFeaturesToTrack(gray, points[1], MAX_COUNT, 0.01, 10, Mat(), 3, 0, 0.04);
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cornerSubPix(gray, points[1], subPixWinSize, Size(-1,-1), termcrit);
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addRemovePt = false;
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}
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else if( !points[0].empty() )
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{
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vector<uchar> status;
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vector<float> err;
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if(prevGray.empty())
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gray.copyTo(prevGray);
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calcOpticalFlowPyrLK(prevGray, gray, points[0], points[1], status, err, winSize,
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3, termcrit, 0, 0.001);
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size_t i, k;
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for( i = k = 0; i < points[1].size(); i++ )
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{
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if( addRemovePt )
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{
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if( norm(point - points[1][i]) <= 5 )
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{
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addRemovePt = false;
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continue;
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}
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}
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if( !status[i] )
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continue;
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points[1][k++] = points[1][i];
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circle( image, points[1][i], 3, Scalar(0,255,0), -1, 8);
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}
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points[1].resize(k);
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}
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if( addRemovePt && points[1].size() < (size_t)MAX_COUNT )
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{
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vector<Point2f> tmp;
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tmp.push_back(point);
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cornerSubPix( gray, tmp, winSize, cvSize(-1,-1), termcrit);
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points[1].push_back(tmp[0]);
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addRemovePt = false;
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}
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needToInit = false;
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imshow("LK Demo", image);
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char c = (char)waitKey(10);
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if( c == 27 )
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break;
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switch( c )
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{
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case 'r':
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needToInit = true;
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break;
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case 'c':
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points[0].clear();
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points[1].clear();
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break;
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case 'n':
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nightMode = !nightMode;
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break;
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}
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std::swap(points[1], points[0]);
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cv::swap(prevGray, gray);
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}
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return 0;
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}
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