Quadrilateral Detection & Pose Estimation

How can i estimate the pose of a quadrilateral using OpenCV. I only need to de开发者_如何学Gotect a Rectangle on the frame..not all the quadrilaterals on the screen

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Yes with correspondences between the source points (real world points) and destination points (image points), you can calculate homography. All you need to do is find the corners of a rectangular cardboard in the image and using the real world points, you can find homography.

There is already a function for it in opencv. Look here for more details.