segmentation

segmentation - Ink Segmentation Lecture #7: Ink...

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1 Ink Segmentation Lecture #7: Ink Segmentation 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
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2 Segmentation ± Determine which strokes go together ± Determine which strokes should be apart ± Can be done in real-time or in batch ± Often uses proximity and timing information Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. Grouping Strokes Together ± Why? – Multiple strokes can form one symbol ² math symbols, shapes, etc… ² want to pass all strokes that make up a symbol to recognizer 4 strokes 4 strokes Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. 2 strokes 3 strokes
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3 Grouping Strokes Together – Basic Approach ± Check to see if two or more strokes intersect if they do then group them togethe ² if they do then group them together ± Can use simple line segment intersection tests ± Problems ² ink strokes – ink polyline what if two strokes do not intersect but should be Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr.
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segmentation - Ink Segmentation Lecture #7: Ink...

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