recognition - Symbol Recognition in SketchBased Interfaces...

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1 Fall 2008 CAP 6938 – Topics in Pen-Based User Interfaces ©Joseph J. LaViola Jr. Symbol Recognition in Sketch- Based Interfaces Lecture #9: Symbol Recognition 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
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2 Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Symbol Recognition ± Want to recognize handwritten symbols ² characters ² shapes ² gestures ± Use machine learning approach ± Which algorithm? ² depends on number of symbols in alphabet ² complexity (i.e., similarity of symbols) ² distribution assumptions Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Recognition Algorithms ± Many different approaches ± Machine learning techniques (classification) ² linear classifiers ² k-means classifiers ² neural networks ² Hidden Markov Models ² template matching ² support vector machines ² AdaBoost ± Curve matching ² elastic matching ± Primitive decomposition
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3 Fall 2008 CAP 6938 – Topics in Pen-based User Interfaces ©Joseph J. LaViola Jr. Rubine’s Gesture Recognition Algorithm (Rubine 1991) ± Simple linear classifier ± Utilizes rejection metrics ± Assumes normality for features ± Simple to implement ± Does not need a lot of training samples 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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recognition - Symbol Recognition in SketchBased Interfaces...

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