Total recall: in-place viewing of captured whiteboard annotations

Authors:
Lars Erik Holmquist;Johan Sanneblad;Lalya Gaye
Affiliations:
Viktoria Institute, Göteborg, SWEDEN;Viktoria Institute, Göteborg, SWEDEN;Viktoria Institute, Göteborg, SWEDEN
Venue:
CHI '03 Extended Abstracts on Human Factors in Computing Systems
Year:
2003

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Abstract

Total Recall introduces a new way to view captured whiteboard annotations. To digitize drawings we used a modified commercial system. However, instead of displaying the annotations on a separate computer screen, Total Recall shows the annotations at the place on the board where they were actually made. The user holds a hand-held computer to the board and moves it to reveal the desirable portion of the captured annotations. By using ultra-sonic positioning and optimized graphics, we achieve a high frame-rate (30 fps), allowing for very smooth panning and interaction. We argue that this way of viewing captured whiteboard annotations is more natural and intuitive than current desktop-based systems.