Abstract:
Augmented reality entails the use of models and their associated
renderings to supplement information in a real scene. In order
for this information to be relevant or meaningful, the models must
be positioned and displayed in such a way that they blend into the
real world in terms of alignments, perspectives, illuminations, etc.
For practical reasons the information necessary to obtain this
realistic blending cannot be know a priori, and cannot be
hard-wired into a system.
Instead a number of calibration procedures are necessary so that
the location and parameters of each of the system components are
known. In this paper we identify the calibration steps necessary
to build a computer model of the real world and then, using the
monitor-based augmented reality system developed at ECRC (Grasp)
as an example, we describe each of the calibration processes. These
processes determine the internal parameters of our imaging devices
(scan converter, frame grabber, and video camera), as well as the
geometric transformations that relate all of the physical objects
of the system to a known world coordinate system.