I have tried to use ROI to extract parts of image, but I haven't succeded. I have an image which contains rectangles - outlines of detected moving object.
This is the outcome I want. i want to extract those parts which are defined by those rectangles to same-sized matrix
I have tried something like
cropMat(boudingRect) = frame(boundinRect);
but with this I get only the rectangles, not the part that is inside
you want copyTo(), not a simple "=" assignment:
Mat cars = imread("cars.jpg");
Mat draw = Mat(cars.size(), cars.type(), Scalar::all(0));
Rect r1(84,81,130,76);
Rect r2(417,144,153,85);
cars(r1).copyTo(draw(r1));
cars(r2).copyTo(draw(r2));
imshow("draw",draw);
waitKey();
What was wrong with the copyTo? why is it better than simple =?
You could create a 0-image where you add the info in the rectangles; something like this :
cv::Mat justInfo = cv::Mat::zeros(frame.size(), frame.type());
for (cv::Rect roi : detections)
{
justInfo(roi) = frame(roi);
}
Asked: 2016-02-10 07:56:47 -0600
Seen: 15,296 times
Last updated: Feb 10 '16