I am currently calibrating 2D digital camera with 3D tracking system(Optical tracking system or Electromagnetic tracking system).
In most of the literature I studied, First the camera is calibrated with checkerboard pattern then the calibration between camera and the 3D tracking system is obtained by hand-eye calibration technique to get the Rotation and translation.
I used Direct Linear Transform to calibrate the 3D tracking system and camera. The position and orientation of camera is determined in 3D tracker coordinate frame. Calibration is done by locating same calibration points in camera frame and 3D tracker frame.
Now if I need to transform a point from 3D tracker frame to camera frame would it be the correct according to the method I used? Can I bypass the Hand -Calibration according to method I used?
I would like to apologize for the long post. Thank you for your precious time.
Hi,
I'm a little confused about your 3D tracking system. Are you trying to calibrate your 2D camera with this system? Or you just want to calibrate your camera to build a stereo-vision system?
According to my experience, camera calibration is often used to remove the distortion of lens. As your mentioned rotation and translation, I assume that you want to calibrate two cameras to build a stereo-vision system. So I recommend Camera Clibration Toolbox(http://www.vision.caltech.edu/bouguetj/calib_doc/) for you. You can just get your calibration parameters after taking some pictures and the toolbox will calculate automatically.
After you get the calibration parameters, you can generate the tranformation matrix to correct the camera image. Then your stereo algorithm will work.
hi,
if you want to project 3D points into the camera image you need a calibrated camera, i.e. you need to know the intrinsic camera parameters focal length, principal point and distortion. The Camera Calibration Toolbox, mentioned by Yu Luo, is the appropriate tool for that.
With Hand Eye Calibration you get the relative position and attitude of the roboter arm and the camera which you achieved with your calibration of the 3D tracking System.
Now it should be possible to perform 3D measurements.
Thank you Yu Luo and Nikolaus Schweyer for your response. It is helpful for me. Thank you.
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