There is an exception in running the below : When I debugged I found that the code is crashing in the function call calcOpticalFlowFarneback(). I have just run the sample code written below. Could anyone help me solve this issue.I am working in the Qt Creator programming environment -----------------------------------------exception---------------------------------------------------- Starting /home/santhosh/opencv-qt/OpticalFlowDense2/OpticalFlowDense2... OpenCV Error: Assertion failed (prev0.size() == next0.size() && prev0.channels() == next0.channels() && prev0.channels() == 1 && pyr_scale < 1) in calcOpticalFlowFarneback, file /home/santhosh/opencv/opencv-3.1.0-source/modules/video/src/optflowgf.cpp, line 1102 terminate called after throwing an instance of 'cv::Exception' what(): /home/santhosh/opencv/opencv-3.1.0-source/modules/video/src/optflowgf.cpp:1102: error: (-215) prev0.size() == next0.size() && prev0.channels() == next0.channels() && prev0.channels() == 1 && pyr_scale < 1 in function calcOpticalFlowFarneback
The program has unexpectedly finished.
----------------------------Code--------------------------------------------------------------------------- void drawOptFlowMap (const Mat& flow, Mat& cflowmap, int step, const Scalar& color);
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); Mat prev_im,nex_im,flow;
prev_im=imread("image1.jpg",0);
if (!prev_im.data)
{
QMessageBox msg;
msg.setText("Could not Load image1");
msg.exec();
}
//namedWindow("previm", cv::WINDOW_AUTOSIZE);
imshow("previm",prev_im);
nex_im=imread("image2.jpg",0);
if (!nex_im.data)
{
QMessageBox msg;
msg.setText("Could not Load image2");
msg.exec();
}
//namedWindow("nextim", cv::WINDOW_AUTOSIZE);
imshow("nextim",nex_im);
calcOpticalFlowFarneback(prev_im,nex_im,flow,0.5, 1, 12, 2, 7, 1.5, 0);
Mat cflow;
cvtColor(prev_im, cflow, CV_GRAY2BGR);
drawOptFlowMap(flow, cflow, 10, CV_RGB(0, 255, 0));
imshow("OpticalFlowFarneback", cflow);
waitKey(0);
}
void drawOptFlowMap (const Mat& flow, Mat& cflowmap, int step, 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(cvRound(x+fxy.x), cvRound(y+fxy.y)), 1, color, -1);
}
} }
