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U. Glaeser

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slots specifying pieces of information about the command. Recognition results from each modality agent<br />

are parsed into partially filled frames, which are then merged together to produce a combined interpretation.<br />

In the merging process information from different input modes is weighted, meaningless command<br />

hypotheses are filtered out, and additional feedback from the user might be requested.<br />

Summary<br />

As more electronic devices with pen interfaces have and continue to become available for entering and<br />

manipulating information, applications need to be more effective at leveraging this method of input.<br />

Pen is a mode of input that is very familiar for most users since everyone learns to write in school. Hence,<br />

users will tend to use this as a mode of input and control when available. Providing enhanced userinterfaces<br />

that will make it easier for users to use the pen interface in effective ways will make it easier<br />

for them to work with such devices.<br />

Section 42.6 has given an overview of the pen input devices available today along with some of the<br />

applications that use the electronic pen either in isolation or in conjunction with other modes of input such<br />

as speech and the keyboard. The community has made great strides in addressing a number of the userinterface<br />

issues for capturing and manipulating information from electronic pens. A number of challenges<br />

still need to be addressed before such devices truly meet the needs of a user to a higher level of satisfaction.<br />

To Probe Further<br />

Pen Computing. http://hwr.nici.kun.nl/pen-computing. A Web site hosted at the Nijmegen University<br />

with links related to practical issues in pen and mobile computing.<br />

Handhelds. http://handhelds.org. A Compaq-hosted Web site created to encourage and facilitate the<br />

creation of open source software for use on handheld and wearable computers.<br />

Acknowledgment<br />

The authors thank Thomas G Zimmerman, Research Staff Member with the Human/Machine Interface<br />

Gadgets at IBM Research, for his input on the subsection on “Pen Input Hardware,” and Carlos McEvilly,<br />

Research Staff Member with the Motorola Human Interface Labs, for proofreading this manuscript.<br />

References<br />

1. G. Seni, T. Anastasakos. Non-cumulative character scoring in a forward search for online handwriting<br />

recognition. In IEEE Conf. on Acoustics, Speech and Signal Processing, Istanbul, 2000.<br />

2. K.S. Nathan, H.S.M. Beigi, J. Subrahmonia, G.J. Clary, M. Maruyama. Real-time on-line unconstrained<br />

handwriting recognition using statistical methods. In IEEE Conf. on Acoustics, Speech and Signal Processing,<br />

Michigan, 1995.<br />

3. S. Jaeger, S. Manke, A. Waibel. NPEN++<br />

: An online handwriting recognition system. In Proc. Workshop<br />

on Frontiers in Handwriting Recognition, Amsterdam, The Netherlands, 2000.<br />

4. www.mimio.com.<br />

5. www.e-pen.com.<br />

6. H.R. Lewis, C.H. Papadimitriou. Elements of the Theory of Computation. Prentice-Hall, Englewood<br />

Cliffs, NJ, 1981.<br />

7. Speech Recognition Grammar Specification for the W3C Speech Interface Framework. W3C Working<br />

Draft. www.w3.org/TR/grammar-spec. 2001.<br />

8. H. Freeman. Computer processing of line-drawing data. Computer Surveys. March 1974.<br />

9. T.S. Huang. Coding of two-tone images. IEEE Trans. COM-25. November 1977.<br />

10. J. Andrieux, G. Seni. On the coding efficiency of multi-ring and single-ring differential chain coding<br />

for telewriting application. To appear in IEE Proceedings—Vision, Image and Signal Processing.<br />

11. ITU-T Recommendation T.150. Terminal Equipment and Protocols for Telematic Services. 1993.<br />

12. Synchronized Multimedia Integration Language (SMIL) 1.0 specification. W3C Recommendation.<br />

www.w3c.org/TR/REC-smil. 1998.<br />

© 2002 by CRC Press LLC

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