我刚接触OpenCV。我正在尝试检测图像中特定区域内的车辆,例如(300, 400)大小的图像中x=0到139和y=0到300的区域。
那么我应该使用什么条件来检测特定区域中的车辆,并在其进入帧后进行计数?
enter code herevoid processVideo(char* videoFilename) {
//create the capture object
`VideoCapture capture(videoFilename);
if(!capture.isOpened()){
//error in opening the video input
cerr << "Unable to open video file: " << videoFilename << endl;
exit(EXIT_FAILURE);
}
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//read the current frame
if(!capture.read(frame)) {
cerr << "Unable to read next frame." << endl;
cerr << "Exiting..." << endl;
exit(EXIT_FAILURE);
}
//update the background model
pMOG2->apply(frame, fgMaskMOG2);
Mat im_th, src_gray;
cvtColor( frame, src_gray, COLOR_BGR2GRAY );
medianBlur( fgMaskMOG2, fgMaskMOG2, 15 );
threshold( fgMaskMOG2, im_th,230 , 255, THRESH_BINARY_INV);
Mat im_floodfill = im_th.clone();
floodFill(im_floodfill, cv::Point(0,0), Scalar(255));
Mat im_floodfill_inv;
bitwise_not(im_floodfill, im_floodfill_inv);
fgMaskMOG2= im_floodfill_inv;
dilate(fgMaskMOG2, fgMaskMOG2,Mat ());
erode(fgMaskMOG2, fgMaskMOG2,Mat ());
medianBlur( fgMaskMOG2, fgMaskMOG2, 15 );
//adaptiveThreshold(fgMaskMOG2,fgMaskMOG2 ,255,ADAPTIVE_THRESH_GAUSSIAN_C,THRESH_BINARY,11,2);
rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
cv::Scalar(255,0,255), -1);
stringstream ss;
ss << capture.get(CAP_PROP_POS_FRAMES);
string frameNumberString = ss.str();
putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
//show the current frame and the fg masks
imshow("Frame", frame);
imshow("FG Mask MOG 2", fgMaskMOG2);
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;
findContours( fgMaskMOG2, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0,0) );
Mat drawing = frame;
Rect bounding_rect;
vector<Rect> boundRect( contours.size() );
vector<vector<Point> > contours_poly( contours.size() );
Scalar color( 255,0,0); // color of the contour in the
//Draw the contour and rectangle
for( int i = 0; i < s; i++ )
{ //approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
boundRect[i] = boundingRect( Mat(contours_poly[i]) );
}
);
for( int i = 0; i< s; i++ )
{
drawContours( frame, contours_poly, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
rectangle( frame, boundRect[i].tl(), boundRect[i].br(), color, 2, 8, 0 );
}
imshow( "Display window", frame);
}
keyboard = waitKey(39);
}
Point(x,y)
调用findContours(fgMaskMOG2(cv::Rect(x,y,width,height)), ...
,以获得具有原始图像坐标的轮廓。 - Miki