parsing - 1 Fall 2008 CAP 6938 – Topics in Pen-Based User...

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Unformatted text preview: 1 Fall 2008 CAP 6938 – Topics in Pen-Based User Interfaces ©Joseph J. LaViola Jr. Ink Parsing in Sketch-Based Interfaces Lecture #10: Ink Parsing Joseph J. LaViola Jr. Fall 2008 Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Recall Pen-Based Interface Dataflow Raw Stroke Data Preprocessing Segmentation Feature Extraction And Analysis Classification Ink Parsing Sketch Understanding Make Inferences 2 Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Sketch Parsing ¡ Often recognition of strokes is insufficient ¢ except for gestures ¡ Require an understanding of spatial relationships ¢ good examples are mathematical expressions ¡ Higher level classifications ¢ is it a word or a drawing? www.engr.ucr.edu/~stahov/research/acsparc.htm Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Approaches to Sketch Parsing ¡ Top down vs. bottom up ¡ Focus on mathematical expressions ¢ 2D (coordinate) grammars ¢ graph rewriting ¡ useful for other types of parsing as well (diagrams, tables, lists, etc…) ¢ projection profile cutting ¢ procedurally coded syntax rules ¢ stochastic grammars ¡ Other parsing approaches ¢ conditional random fields ¢ statistical visual languages ¢ many others 3 Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr....
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This note was uploaded on 06/13/2011 for the course CAP 6938 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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parsing - 1 Fall 2008 CAP 6938 – Topics in Pen-Based User...

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