I am trying to execute "Lukas-Kanade optical flow lkdemo()" program in visual studio 2015,
I can't able to trace the error in the code
#include
#include
#include
using namespace cv;
using namespace std;
static void help()
{
// print a welcome message, and the OpenCV version
cout << "\nThis is a demo of Lukas-Kanade optical flow lkdemo(),\n"
"Using OpenCV version " << CV_VERSION << endl;
cout << "\nIt uses camera by default, but you can provide a path to video as an argument.\n";
cout << "\nHot keys: \n"
"\tESC - quit the program\n"
"\tr - auto-initialize tracking\n"
"\tc - delete all the points\n"
"\tn - switch the \"night\" mode on/off\n"
"To add/remove a feature point click it\n" << endl;
}
Point2f point;
bool addRemovePt = false;
static void onMouse(int event, int x, int y, int /*flags*/, void* /*param*/)
{
if (event == EVENT_LBUTTONDOWN)
{
point = Point2f((float)x, (float)y);
addRemovePt = true;
}
}
int main(int argc, char** argv)
{
help();
VideoCapture cap;
TermCriteria termcrit(TermCriteria::COUNT | TermCriteria::EPS, 20, 0.03);
Size subPixWinSize(10, 10), winSize(31, 31);
const int MAX_COUNT = 500;
bool needToInit = false;
bool nightMode = false;
if (argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
cap.open(argc == 2 ? argv[1][0] - '0' : 0);
else if (argc == 2)
cap.open(argv[1]);
if (!cap.isOpened())
{
cout << "Could not initialize capturing...\n";
return 0;
}
namedWindow("LK Demo", 1);
setMouseCallback("LK Demo", onMouse, 0);
Mat gray, prevGray, image, frame;
vector points[2];
for (;;)
{
cap >> frame;
if (frame.empty())
break;
frame.copyTo(image);
cvtColor(image, gray, COLOR_BGR2GRAY);
if (nightMode)
image = Scalar::all(0);
if (needToInit)
{
// automatic initialization
goodFeaturesToTrack(gray, points[1], MAX_COUNT, 0.01, 10, Mat(), 3, 0, 0.04);
cornerSubPix(gray, points[1], subPixWinSize, Size(-1, -1), termcrit);
addRemovePt = false;
}
else if (!points[0].empty())
{
vector status;
vector err;
if (prevGray.empty())
gray.copyTo(prevGray);
calcOpticalFlowPyrLK(prevGray, gray, points[0], points[1], status, err, winSize,
3, termcrit, 0, 0.001);
size_t i, k;
for (i = k = 0; i < points[1].size(); i++)
{
if (addRemovePt)
{
if (norm(point - points[1][i]) <= 5)
{
addRemovePt = false;
continue;
}
}
if (!status[i])
continue;
points[1][k++] = points[1][i];
circle(image, points[1][i], 3, Scalar(0, 255, 0), -1, 8);
}
points[1].resize(k);
}
if (addRemovePt && points[1].size() < (size_t)MAX_COUNT)
{
vector tmp;
tmp.push_back(point);
cornerSubPix(gray, tmp, winSize, Size(-1, -1), termcrit);
points[1].push_back(tmp[0]);
addRemovePt = false;
}
needToInit = false;
imshow("LK Demo", image);
char c = (char)waitKey(10);
if (c == 27)
break;
switch (c)
{
case 'r':
needToInit = true;
break;
case 'c':
points[0].clear();
points[1].clear();
break;
case 'n':
nightMode = !nightMode;
break;
}
std::swap(points[1], points[0]);
cv::swap(prevGray, gray);
}
return 0;
}
And I am getting run time error as follows, error
Can anyone explain why this is happening ? Thanks in advance .
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