Editing Augmented reality (section)

===Handheld===
[[File:Wikitude.jpg|thumb|An augmented reality app on a smartphone using [[GPS]] and a [[compass#Solid state compasses|solid state compass]]]]
A handheld display employs a small display that fits in a user's hand. All handheld AR solutions to date opt for video passthrough. Initially handheld AR employed [[fiducial marker]]s,<ref>[http://researchguides.dartmouth.edu/content.php?pid=227212&sid=1891183 Marker vs Markerless AR] {{webarchive|url=https://web.archive.org/web/20130128175349/http://researchguides.dartmouth.edu/content.php?pid=227212&sid=1891183 |date=28 January 2013 }}, Dartmouth College Library.</ref> and later GPS units and MEMS sensors such as digital compasses and [[six degrees of freedom]] accelerometer–[[gyroscope]]. Today [[simultaneous localization and mapping]] (SLAM) markerless trackers such as PTAM (parallel tracking and mapping) are starting to come into use. Handheld display AR promises to be the first commercial success for AR technologies. The two main advantages of handheld AR are the portable nature of handheld devices and the ubiquitous nature of camera phones. The disadvantages are the physical constraints of the user having to hold the handheld device out in front of them at all times, as well as the distorting effect of classically wide-angled mobile phone cameras when compared to the real world as viewed through the eye.<ref>{{cite web |last=Feiner |first=Steve |title=Augmented reality: a long way off? |url=http://www.pocket-lint.com/news/38869/augmented-reality-interview-steve-feiner |work=AR Week |publisher=Pocket-lint |access-date=3 March 2011|date=3 March 2011}}</ref>