1. An electronic system comprising: an image sensor having a field of view of a first area; an illumination source that is configured to illuminate a second area, the second area intersecting the first area to define (a) an intersection region illuminated by the illumination source and within the field of view of the image sensor and (b) a non-intersection region not illuminated by the illumination source and within the field of view of the image sensor; and a processing unit configured to perform operations comprising: receiving an image from the image sensor; analyzing the image to detect an object within the intersection region and exclude objects within the non-intersection region; and determining user input based on the object detected within the intersection region, wherein the user input is determined based on a mapped position of the detected object.