1. A device comprising: a camera configured to acquire a first image and a second image of a scene that includes an object and a background associated with the object, the first image representing a first view of the scene and the second image representing a second, different view of the scene; and a processor configured to: access a luminance characteristic and a background model, determine, for the first image and the second image, a difference between the luminance characteristic and the background model, determine a position of the object based on the determined difference, and generate an input to a application based on the determined position of the object, the input being configured to cause a change in an output of the application.