Information Technology Reference
In-Depth Information
Fig. 2.20
MouseLight combines a digital pen with a separate mobile projector (photo courtesy of
Hyunyoung Song)
ulating the projecting device. This leaves more interactional flexibility and ensures
a stable projection even while the pen is used for writing.
Similar to MouseLight,
FA C T
[78] uses a pen and a separate projection unit. In
contrast to MouseLight, FACT leverages a camera and analyzes visual features to
automatically identify paper documents and to track their position and orientation
in 2D space. As a consequence, no Anoto pattern is required and documents can be
placed and moved quite naturally on a table. The projector provides digital output
on the paper documents in real time, enabling computer-like functionality on paper.
For instance the user can select a word for performing a full-text search by tapping
with the pen on a word that is printed on the document. All occurrences of this
word are then highlighted by the projector directly within the printed document.
Moreover, the system projects digital annotations onto the paper document, such as
links to related Web pages. Further functionalities include Web search, copy/paste
of paper contents and remote sharing. PACER [77], a predecessor system of FACT,
enables similar interactions with paper and a mobile phone, however without in situ
projection of digital contents.
