Virtual Zoom: Augmented Reality on a Mobile Device

The world around us is photographed millions of times a day, and a lot of images nd their way online. We present a way to use this data to augment reality through a mobile phone. With our application, the user can zoom in on a distant landmark using other people's pho- tographs. Our system relies on a 3D scene modeling back end that computes the viewpoint of each photograph in an unordered large photo collection. We present and discuss the overall system archi- tecture, our implementation of the client application on the iPhone, our approach to picking the best views to oer a zoom path, and the complexities and limitations associated with mobile platforms.