gi2006-fluid - Fluid Inking: Augmenting the Medium of...

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Unformatted text preview: Fluid Inking: Augmenting the Medium of Free-Form Inking with Gestures Robert Zeleznik Timothy Miller Computer Science Department Box 1910 Brown University Providence, RI 02912 { bcz,tsm } ABSTRACT We present Fluid Inking, a generally applicable approach to aug- menting the fluid medium of free-form inking with gestural com- mands. Our approach is characterized by four design criteria, in- cluding: 1) pen-based hardware impartiality: all interactions can be performed with a button-free stylus, the minimal input hardware requirement for inking, and the least common denominator device for pen-based systems ranging from PDAs to whiteboards; 2) per- formability: gestures use short sequences of simple and familiar inking interactions that require minimal targeting; 3) extensibility: gestures are a regular pattern of optional shortcuts for commands in an arbitrarily scalable menu system; and 4) discoverability: gesture shortcuts (analogous to modifier keys) are displayed in the interac- tive menu and are suggested with dynamic feedback during inking. This paper presents the Fluid Inking techniques in the unified con- text of a prototype notetaking application and emphasizes how post- fix terminal punctuation and prefix flicks can disambiguate gestures from regular inking. We also discuss how user feedback influenced the Fluid Inking design. CR Categories: H.5.2 [Information Interfaces and Presentation]: User InterfacesGraphical user interfaces; H.5.2 [Information In- terfaces and Presentation]: User InterfacesInput devices and strategies; H.5.2 [Information Interfaces and Presentation]: User InterfacesInteraction styles; Keywords: gestures, button-free, terminal punctuation, inking, tablet computing 1 INTRODUCTION Our motivation to design Fluid Inking developed from our sens- ing an unnecessarily large gap between interacting with the fluid medium of paper-and-pencil and with the user interfaces of current general-purpose inking applications, including those that incorpo- rate gestures. Although we could not completely identify the factors that contribute to this distance, we intuitively felt that expansion of the free-form inking input domain to include special-purpose hard- ware buttons played an important role. Thus, a pervasive theme of our research was to make all functionality available through inter- actions that technically already exist in free-form inking. The chal- lenge then was to implicitly distinguish interactions intended to be commands from those intended to be free-form ink. By definition this problem is not computable without knowing the mental state of the user; however, by making assumptions about the likelihood of certain interaction sequences, we believed that it was possible to make a system that was, in practice, effective....
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This note was uploaded on 06/12/2011 for the course CAP 6105 taught by Professor Lavoila during the Spring '09 term at University of Central Florida.

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gi2006-fluid - Fluid Inking: Augmenting the Medium of...

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