Somebody mentioned distortion due to cheap plastic lenses used in mobile phones. It should be possible to account for this on a per-image basis, or at least use a priori information about the typical camera model parameters found in different makes of phone.
Also, using cell knowledge should reduce the search space.
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Somebody mentioned distortion due to cheap plastic lenses used in mobile phones. It should be possible to account for this on a per-image basis, or at least use a priori information about the typical camera model parameters found in different makes of phone. Also, using cell knowledge should reduce the search space.