ethzasl_ptam camera calibration from set of images

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Hello,

I successfully made my first calibration and rectification using ethzasl_ptam package.

Could it be possible to use still images from another camera, lets say iphone6 camera?

Here is what I am trying to do: I also run lsd_slam with a logitech c910 camera and got varying results, mostly due to I could not move the camera much. I want to capture a video with an iphone camera outdoors, then run lsd_slam on the video file. and for this I would need to calibrate the iphone6 lens, I could still take pictures of a checker pattern and then feed them to the calibration program, but how?

Any ideas/help/recomendations appreciated.

Best regards, C.