1. A method comprising: capturing at least two images of a planar object; determining a first pose, comprising a position and an orientation, of a first mobile platform with respect to the planar object using the at least two images; warping an image of the planar object captured by the first mobile platform using the orientation of the first mobile platform with respect to the planar object to produce a reference image of a front view of the planar object; and determining a second pose of a second mobile platform with respect to the planar object using a second image of the planar object captured by the second mobile platform and the reference image.