Smartphones have become indispensable computational tools. However, some tasks can be difficult to perform on a smartphone\nbecause these devices have small displays. Here, we explore methods for augmenting the display of a smartphone, or other PDA,\nusing interactive paper. Specifically, we present a prototype interface that enables a user to interactively interrogate technical\ndrawings using an Anoto-based smartpen and a PDA. Our software system, called PaperCAD, enables users to query geometric\ninformation from CAD drawings printed on Anoto dot-patterned paper. For example, the user can measure a distance by drawing\na dimension arrow.The system provides output to the user via a smartpen�s audio speaker and the dynamic video display of a PDA.\nThe user can select either verbose or concise audio feedback, and the PDA displays a video image of the portion of the drawing near\nthe pen tip. The project entails advances in the interpretation of pen input, such as a method that uses contextual information to\ninterpret ambiguous dimensions and a technique that uses a hiddenMarkov model to correct interpretation errors in handwritten\nequations. Results of a user study suggest that our user interface design and interpretation techniques are effective and that users\nare highly satisfied with the system.
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