  We propose a method for guiding a photographer to rotate her/his smartphone
camera to obtain an image that overlaps with another image of the same scene.
The other image is taken by another photographer from a different viewpoint.
Our method is applicable even when the images do not have overlapping fields of
view. Straightforward applications of our method include sharing attention to
regions of interest for social purposes, or adding missing images to improve
structure for motion results. Our solution uses additional images of the scene,
which are often available since many people use their smartphone cameras
regularly. These images may be available online from other photographers who
are present at the scene. Our method avoids 3D scene reconstruction; it relies
instead on a new representation that consists of the spatial orders of the
scene points on two axes, x and y. This representation allows a sequence of
points to be chosen efficiently and projected onto the photographers images,
using epipolar point transfer. Overlaying these epipolar lines on the live
preview of the camera produces a convenient interface to guide the user. The
method was tested on challenging datasets of images and succeeded in guiding a
photographer from one view to a non-overlapping destination view.
