The first is the pinhole camera model. We try and approximate real world positions to pixels using this matrix.
The second is the camera motion estimate. We need to use data from the gyroscope to figure out the orientation of the phone at any given moment.
The third is the rolling shutter computation. We need to specify the direction of the rolling shutter and estimate the duration of the rolling shutter.
There are three unknowns. The o variables indicate the origin of the camera axis in the image plane (these can be assumed to be 0). The two 1s in the matrix indicate the aspect ratio...