Calculate Pitch and Roll and YAW by 4 points detected from a square in Opencv

Question

I have a rectangle picture like this image :

Original Photo

But after that I took a photo from the camera like this :

enter image description here

Photo By Camera

I detected 4 corners of my rectangle by approxPolyDP. The points that I detected are these values:

Now how can I calculate Pitch, Roll and Yaw by these 4 points?

Aren't pitch,roll and yaw angles for 3d objects? In which axis did you rotate your rectangle? I think there is a mistake or I misunderstood. — Yunus Temurlenk, Feb 09 '20 at 17:29
It's just a 2d rectangle but I rotated it in 3d axis. I added the real photo so you could see that. — Sina Asefi, Feb 09 '20 at 19:43
To do that you need a stereo camera to be able to take deep and also i think with those given 4 coordinates (2d) ıts not possible to calculate — Yunus Temurlenk, Feb 09 '20 at 19:58
But if you see we have Pose Estimation for that in opencv but I don't know how can I use from that like this link [link](https://docs.opencv.org/master/d7/d53/tutorial_py_pose.html) — Sina Asefi, Feb 09 '20 at 20:16

score 1 · Answer 1 · answered Feb 10 '20 at 02:40

See How to calculate perspective transform for OpenCV from rotation angles?. You would have to work backwards from that solution.

Getting the transformation matrix is the easy part using getPerspectiveTransform. Figuring out the pitch, roll, and yaw from that matrix would be solving for angles in the single rotation matrix written here: http://planning.cs.uiuc.edu/node102.html for the respective Euler angles. Formula

Calculate Pitch and Roll and YAW by 4 points detected from a square in Opencv

1 Answers1