RESEARCH ON OUTDOOR AUGMENTED REALITY SYSTEM BASED ON
ARTOOLKIT
X. Liu, Q. Du, T. Liu
liu2707@163.com
Augmented
Reality(AR) is a technology that overlays virtual image and information
generated by computer on real world seen by the user ,it can provide a more
nature user interface for engineers and establish fascinating environment for
education and entertainment applications. Outdoor Augmented Reality is a new
direction in the field of AR research in recent years,its difficulty is
concentrated on the sensor technology and registration .ARToolKit provides a
convenient and quick tool to develop AR application ,but its registration
method is based on computer-vision .Outdoor environment is complicated,so
ARToolKit must be improved to suit for outdoor AR application.
In this paper, author put forward a hybra registration based on GPS and
electronic compass in an outdoor AR system.Central system receives original observational
data from GPS and electronic compass,and send them to the DBMS passing through
revising. Then the data and virtual object could be put into the database .When
user is padding in the environment,system can select appropriate virtual object
to match real scence on the foundation of data from the sensors.
This paper includes some
sections ,as following: Firstly,introducing the
system structure 、 work flow and developing flow of ARToolKit ; Secondly,performeing indoor Augmented Reality with
ARToolKit to validate the registration algorithm based on markers;Thirdly, the key technologies of system ,for example
3D registration technology 、display、tracking 、virtual
modeling technology and spatial database, are introduced in detail; Fourthly, according as the real instance puting
forward a hybra registration based on GPS and electronic compass in an outdoor
AR system .In this section ,we bring forward the frame including the hardware
and software needed ,the function including enhancing the virtual
information、querying the attribute value、navigation and spatial
measure .Application of outdoor AR system are
also completed,because ARToolKit is based on computer-vision, we must
amend some functions to accommodate the outdoor AR system found on sensor and
add some functions to take over the data from sensors. Virtual objects are
created by VRML or 3D max ,all of the procedures are integrated in Visual
Studio 2005.Finally,in view of huge error of data provided by GPS and the
electronic compass,we must adopt some methods of improving the registration precision
to achieve good precision.