CODEWITHSUNDEEP
c++opencvdrawing
min.yong.yoon
min.yong.yoon

Reputation: 490

Unhandled exception drawing not convex poly using fillPoly from OpenCV 2.4.3 C++ interface

I am trying to draw in a binary image some connected component found with findContours, using OpenCV 2.4.3 c++ interface. The code is like this. 

std::vector<std::vector<cv::Point> > contours;
std::vector<cv::Vec4i> hierarchy;
cv::findContours( tempOR, contours, hierarchy, CV_RETR_EXTERNAL , CV_CHAIN_APPROX_TC89_L1, cv::Point(0, 0) );

bgs_detection_or=cv::Mat::zeros(cv::Size(m_frame_width, m_frame_height), CV_8UC1);
for( int i = 0; i < contours.size(); i++ )
{
    if (pointPolygonTest(contours[i], cv::Point2f(m_car_coords.x, m_car_coords.y-1), false)>-1)
    {
        std::vector<cv::Point> contours_poly;
        approxPolyDP( cv::Mat(contours[i]), contours_poly, 3, true );           

        //cv::fillConvexPoly(bgs_detection_or, contours_poly, cv::Scalar(255));
        cv::fillPoly(bgs_detection_or, contours_poly, cv::Scalar(255));
        break;
    }
}

As you can see, I also tried to use fillConvexPoly. fillConvexPoly does not throw any error, but it does not draw correctly the polies. After that I tried to use fillPoly, and that is all, I cannot manage the unhandled exception.

I also tried to call fillPoly this way:

cv::fillPoly(bgs_detection_or, contours_poly, contours_poly.size(), 1, cv::Scalar(255));

But then I have a compile error: Error 35 error C2665: 'cv::fillPoly' : none of the 2 overloads could convert all the argument types

What am I doing wrong?

Upvotes: 1

Views: 1834

Answers (1)

min.yong.yoon
min.yong.yoon

Reputation: 490

I found a workaround to achieve the final goal:

drawContours( bgs_detection_or, contours, i, cv::Scalar(255), CV_FILLED);

But I cannot understand why fillPoly throws unhandled error while fillConvexPoly is not.

Upvotes: 1

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