Editing Emerging Research Directions (section)

=== Types of AR ===
For AR, there is not a one size fits all AR application.  AR applications differ in their approach, need, and usability in different industries. From marker dependency to simply projecting the content onto a surface, AR applications come in wide ranges to fit the differing needs.  


[[File:Types_of_AR_Apps.jpg]]

Different Types of AR Applications [1].

'''Marker Based AR:'''
* By using objects and images as markers, Maker Based AR uses these preidentified markers as triggers for digital elements.  Depending on the type of marker, the AR application places the interactive content at that location. 

'''Markerless AR:'''
* Unlike Marker Based AR, Markerless AR does not rely on markers to engage with its content. Utilizing sensor data, such as GPS or cameras, the position of the user can be determined and virtual content placed accordingly.

'''Location Based AR:'''
* Location Based AR is a form of Markerless AR, as it also utilizes the GPS of the user to implement the digital content. 

'''Projection Based AR:'''
* Projection Based AR needs no location or marker to implement its content, and rather projects the content onto a surface for interaction.

'''Outlining Based AR:'''
* Outlining Based AR uses edges and boundaries employed by image recognition to identify objects then layers the digital content atop them.


As many of these types of AR applications differ in implementation, affect, and inner workings, they can be applied to different sectors in society, commercial applications, and have been developed to fit distinct research project needs in scientific development. These specifications are expanded upon in the table below. 



{| class="wikitable" style="width:100%; text-align:left;"
|+ Types of AR Applications [5]
|-
! Type
! Sector
! Applications
! Scientific Development
|-
| Marker Based
| Museums and Exhibits, Retail and Marketing, Maintenance and Repair
| Interactive Exhibitions, Augmented Reality Retail Store Catalog, Complete Repair Tasks, Aircraft Maintenance
| The Museum of London's Street Museum App, Virtual Try-On Technology in Retail
|-
| Markerless
| AR Navigation Apps, AR Games, AR Furniture Apps, AR Social Media Filters, AR Maintenance and Repair
| Pokémon Go, Instagram Filters, Object Recognition to Identify Specific Elements
| An Outdoor Augmented Reality Mobile Application Using Markerless Tracking
|-
| Projection Based
| Paleontology, Industrial Training, AR Furniture Apps, Maintenance, Entertainment and Gaming
| Projection of Computer-Generated Information onto Fossil Specimens
| The Virtual Mirror
|-
| Outlining Based
| Manufacturing, Education, Architecture, Medical Procedures
| Machine Maintenance, Surgeries, Assembling Parts
| A Conceptual Framework for Integrating Building Information Modelling & Augmented Reality (3D Architectural Visualizations)
|}