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Per Ola Kristensson

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Publications by Per Ola Kristensson (bibliography)

» 2009 «

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Kristensson, Per Ola and Denby, Leif C. (2009): Text entry performance of state of the art unconstrained handwriting recognition: a longitudinal user study. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 567-570. Available online

“We report on a longitudinal study of unconstrained handwriting recognition performance. After 250 minutes of practice, participants had a mean text entry rate of 24.1 wpm. For the first four hours of usage, entry and error rates of handwriting recognition are about the same as for a baseline QWERTY software keyboard. Our results reveal that unconstrained handwriting is faster than what was previously assumed in the text entry literature.”

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Zhai, Shumin, Kristensson, Per Ola, Gong, Pengjun, Greiner, Michael, Peng, Shilei Allen, Liu, Liang Mico and Dunnigan, Anthony (2009): Shapewriter on the iPhone: from the laboratory to the real world. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 2667-2670. Available online

“We present our experience in bringing ShapeWriter, a novel HCI research product, from the laboratory to real world users through iPhone's App Store.”

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Spaulding, Aaron, Gajos, Krzysztof Z., Jameson, Anthony, Kristensson, Per Ola, Bunt, Andrea and Haines, Will (2009): Usable intelligent interactive systems: CHI 2009 special interest group meeting. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 2743-2746. Available online

“The AI and HCI communities have often been characterized as having opposing views of how humans and computers should interact" observes Winograd in Shifting Viewpoints. It is time to narrow this gap. What was once considered the forefront of artificial intelligence (AI) research can now be found in commercial products. While some have failed, others, such as face detection in digital cameras or product recommendation systems, have become so mainstream they are no longer thought of as artificial intelligence. This special interest group provides a forum to examine the apparent gap between HCI and AI communities, to explore how intelligent technologies can enable novel interaction with computation, and to investigate the challenges associated with understanding human abilities, limitations, and preferences in order to drive the design of intelligent interactive systems.”

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Vertanen, Keith and Kristensson, Per Ola (2009): Parakeet: a continuous speech recognition system for mobile touch-screen devices. In: Proceedings of the 2009 International Conference on Intelligent User Interfaces 2009. pp. 237-246. Available online

“We present Parakeet, a system for continuous speech recognition on mobile touch-screen devices. The design of Parakeet was guided by computational experiments and validated by a user study. Participants had an average text entry rate of 18 words-per-minute (WPM) while seated indoors and 13 WPM while walking outdoors. In an expert pilot study, we found that speech recognition has the potential to be a highly competitive mobile text entry method, particularly in an actual mobile setting where users are walking around while entering text.”

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Vertanen, Keith and Kristensson, Per Ola (2009): Parakeet: a demonstration of speech recognition on a mobile touch-screen device. In: Proceedings of the 2009 International Conference on Intelligent User Interfaces 2009. pp. 483-484. Available online

“We demonstrate Parakeet -- a continuous speech recognition system for mobile touch-screen devices. Parakeet's interface is designed to make correcting errors easy on a handheld device while on the move. Users correct errors using a touch-screen to either select alternative words from a word confusion network or by typing on a predictive software keyboard. Our interface design was guided by computational experiments. We conducted a user study to validate our design. We found novices entered text at 18 WPM while seated indoors and 13 WPM while walking outdoors.”

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» 2008 «

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Kristensson, Per Ola and Zhai, Shumin (2008): Improving word-recognizers using an interactive lexicon with active and passive words. In: Proceedings of the 2008 International Conference on Intelligent User Interfaces 2008. pp. 353-356. Available online

“The words a user is likely to write comprise the user's active vocabulary. This vocabulary is considerably smaller than the passive vocabulary of words a user reads. We explore an interactive adaptive lexicon method that separates a large lexicon into active and passive sets, and gradually expands and adapts the active set to reflect the user's active vocabulary. The adaptation is achieved through lightweight interaction as a by product of actual use. The effectiveness of the technique is demonstrated through a computational experiment and a user study.”

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Kristensson, Per Ola, Arnell, Olof, Björk, Annelie, Dahlbäck, Nils, Pennerup, Joackim, Prytz, Erik, Wikman, Johan and Åström, Niclas (2008): InfoTouch: an explorative multi-touch visualization interface for tagged photo collections. In: Proceedings of the Fifth Nordic Conference on Human-Computer Interaction 2008. pp. 491-494. Available online

“We report on a design exploration into how a large multi-touch tabletop display can be used for information visualization. We designed an interface where users explored a tagged photo collection by bi-manual manipulation of the collections' tag cloud. User feedback showed that despite the availability of multi-touch most of the actual interactions were single-touch. However, some particular natural actions, such as grabbing the tag cloud and partitioning it into two parts, were often carried with both hands. Thus our user study indicates that multi-touch can act as a useful complementary interaction method in information visualization interfaces.”

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Changes to this page (author)

17 Feb 2010: Enabled abstracts to be shown on Per Ola Kristensson's author page.
02 Jun 2009: Author was edited

02 Jun 2009: Author was edited
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08 Apr 2009: Author was added to the bibliography

Publication statistics

Publication period:2008-2009
Publication count:7
Number of co-authors:20

Productive colleagues

Per Ola Kristensson's 3 most productive colleagues in number of publications:

Shumin Zhai:55
Anthony Jameson:18
Andrea Bunt:10

Collaboration count

Number of publications with 3 favourite co-authors:

Shumin Zhai:2
Keith Vertanen:2
Annelie Björk:1

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Conference Calendar

Mar 21

WritersUA Conf. for Software User Assistance

Mar 22

Workshop on Pervasive healthcare in the home : Supporting patient motivation and engagement

Mar 22

UX People

Mar 16

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Eva Hornecker on Tangible Interaction

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Per Ola Kristensson

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