How to get specific point and draw Rectangle on QImage?

[YDYD]

Hi all ,

I am currently working on robot vision system,

I would like to track something using Rasp-pi with Webcam.

After i process my image, i would like to box the part i needed ask the pic shown,
"Link of Pic":http://www.facebook.com/photo.php?fbid=10152540949803695&set=a.10150169149868695.310362.677773694&type=1&theater

!http://www.facebook.com/photo.php?fbid=10152540949803695&set=a.10150169149868695.310362.677773694&type=1&theater(MyPic)!

How can i do to achieve this?

Would like to rectangle the biggest part.

I did use opencv libs to find contours and get cvpoint, but i cant get exactly what i want.

please advise

Thanks in advance

[SGaist]

Hi,

Since you are already using OpenCV, you should continue with it and only convert the image to a QImage before displaying it.

[YDYD]

I could not get through it.
Is that any Qt method?

[SGaist]

What did you try to paint the rectangle and how did it fail ?