title: Detect object stored in Mat image opencv
body: <p>I'm trying to detect an object using opencv and Visual Studio Ultimate using C++. I'm having problems concerning cv::Mat, I cannot find any example of object detection with that kind of variable but just with IplImage. I tried to use an IplImage code and convert it to Mat, but it didn't work. But i don not want to use IplImage, my first part of code is in Mat and I want to keep using it. </p>
  
  <p>What I'm trying to actually do is to detect the BIGGEST rectangle in the image stored from the cam, after thresholding it. </p>
  
  <p>I have already done the threshold part and it's ok, it works and i can se my object (in white) moving in a black background. </p>
  
  <p>Could someone help me with the tracking part? I have seen on the net some blob filtering solutions but they were way too difficult for me! If you can  come up with an easy one it would be better.</p>
  
  <p>thank you!</p>