Question

I tried to get the inverse perspective to get a frame captured in real-time to the camera plane using the following code:

Mat dst;
    dst=dst.zeros(frame.cols,frame.rows,frame.type());  

    if(Found){

     Mat mmat;
     mmat.create(3,3,CV_32FC1);
     mmat=getPerspectiveTransform(templPoints,imgPoints);
     cout<< mmat<<endl<<endl;
     warpPerspective(frame,dst,Homo,dst.size(),INTER_LINEAR );
     imshow("out",dst);
    }

the problem is that the dst image is totally black , what’s wrong with my code?

Answer 1

The image you are seeing is usually the result of sending the source points into getPerspectiveTransform in the wrong order. This means that the points are crossing each other and triangular shapes will appear. Check the order of the points and make sure they match the order of the destination points.