1. An electronic system comprising: a camera having a field of view of a first area; an illumination source that is angled with respect to the camera and that is configured to illuminate a second area, the second area intersecting the first area to define an intersection region within the field of view of the camera; and a processing unit configured to perform operations comprising: capturing an image from the camera; analyzing the image captured by the camera to detect an object within the intersection region; determining user input based on the object detected within the intersection region; and controlling an application based on the determined user input.