Information Technology Reference
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operations introduced by the DigitalDesk and Augmented Surfaces. A drag-off ges-
ture creates a digital copy of sketches that were made on physical paper. In the
reverse direction, the user can snap digital images to paper surfaces.
Some time after interactive desk and table systems allowed for combining paper
and displays in a horizontal configuration, interactive wall systems addressed the
use of paper directly on vertical displays. The
Designers' Outpost
[63] focuses on
creative planning tasks with post-it stickers (Fig. 2.23). It features a rear-projection
whiteboard on which users can create hybrid physical-digital collages. These col-
lages consist of physical post-it stickers that are attached onto the whiteboard and of
virtual pen traces that are made on the whiteboard. A set of interactions allows for
attaching a post-it at an arbitrary location on the whiteboard, moving or removing
it, as well as for adding virtual pen traces. The locations and contents of the post-
it stickers are automatically captured by a camera. This allows the user to save all
contents of the board with one simple click. Saved contents can be accessed either
on the whiteboard or via a computer interface.
DigiPost
[50] uses a similar principle
on a horizontal tabletop display.
Similar to Designers' Outpost,
DocuDesk
[27] captures the physical arrangement
of paper items. Its aim is to support users in creating multi-way links between paper
documents and digital documents that are displayed on a horizontal tabletop. The
system automatically captures contents of paper documents as well as hyperlinks.
This allows the user to quickly re-establish the state of open windows and docu-
ments when resuming a task. To do so, it suffices to place one of the documents
onto the screen. All other documents which are linked to that one are then displayed
on the screen.
Placing paper documents onto a display potentially occludes digital contents.
Only recently, research started addressing paper-based occlusion of screen contents.
An empirical study [146] analyzed spatial patterns of how printed and digital doc-
Fig. 2.23
The Designers' Outpost (photo courtesy of Scott Klemmer)
