How can I get camera calibration parameters for iphone 6s? I need the following intrinsic parameters:
Cam_fx: normalized focal length in x
Cam_fy: normalized focal length in y
Cam_cx: normalized camera center in x
Cam_cy: normalized camera center in y
Cam_s: normalized distortion factor
I tried using the [PTAM](http://wiki.ros.org/ethzasl_ptam/Tutorials/camera_calibration) camera calibration process but im getting some errors. Can anyone please suggest me some other way?
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