Equation Entry and Editing via Handwriting and Gesture Recognition
by Steven Smithies, Kevin Novins and Jim Arvo. Behaviour
and Information Technology, 20(1), pp. 84-91, January 2001.
We describe a system for freehand entry and editing of
mathematical expressions using a pen and tablet. The expressions are
entered in the same way that they would be written on paper. The
system interprets the results and generates output in a form suitable
for use in other applications, such as word processors or symbolic
manipulators. Interpretation includes character segmentation,
character recognition, and formula parsing. Our interface
incorporates easy to use tools for correcting interpretation errors at
any stage. The use can also edit the handwritten representation and
ask the system to reinterpret the results.
By recovering the formula's structure directly from its hand-written
form, the user is free to use common conventions of mathematical
notation without regard to internal representation. We report the
results of a small user study, which indicate that the new style of
interaction is effective.
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