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U. Glaeser

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FIGURE 42.47 Example of pen-and-paper-like editing. Users can perform erasing by scribbling directly on the<br />

unwanted text, moving text by circling and dragging, and transposing text by common gesturing.<br />

FIGURE 42.48 Segmentation and recognition of on-line documents. Example of a typical handwritten page with<br />

text, tables and drawings; and the desired segmentation interpretation.<br />

Smart Ink<br />

One can extend the gesture recognition system to allow users to associate more complex actions with<br />

groups of pen strokes as shown in Fig. 42.48. The handwritten document on the left side is a typical<br />

handwritten page with text, tables and drawings, and the one of the right side is a version of the same<br />

document after being automatically interpreted by a smart ink recognition scheme. This association<br />

allows users to work with handwritten documents in more efficient ways, which turn an electronic pen<br />

into a more effective way of entering information than a keyboard and mouse.<br />

A successful implementation of these ideas led to the development of a tool, called SILK [35],<br />

which allows graphic designers to quickly sketch a user-interface with a electronic pen and stylus.<br />

The tool addresses the needs of designers who prefer to sketch early interface ideas on paper or<br />

whiteboard and concentrate on behavior. Existing interactive user interface construction tools make it<br />

© 2002 by CRC Press LLC

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