recognition - Symbol Recognition in SketchBased Interfaces...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Symbol Recognition in Sketch- Based Interfaces Lecture #10: Symbol Recognition Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. Joseph J. LaViola Jr. Fall 2009 Recall Pen-Based Interface Dataflow Raw Stroke Preprocessing Segmentation Data Feature Extraction And Classification Ink Parsing Sketch Understanding Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. Analysis Make Inferences
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Symbol Recognition ± Want to recognize handwritten symbols ² characters ² shapes ² gestures ± Use machine learning approach ± Which algorithm? Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. ² depends on number of symbols in alphabet ² complexity (i.e., similarity of symbols) ² distribution assumptions 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 AdaBoos Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. AdaBoost ± Curve matching ² elastic matching ± Primitive decomposition
Background image of page 2
3 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 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. Recall Rubine’s Feature Set ± Cosine and sine of initial angle ± Length and angle of bounding box diagona Length and angle of bounding box diagonal ± Distance between first and last point ± Cosine and sine of angle between first and last point ±
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 9

recognition - Symbol Recognition in SketchBased Interfaces...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online