preprocessing - 1 Fall 2008 CAP 6938 Topics in Pen-Based...

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Unformatted text preview: 1 Fall 2008 CAP 6938 Topics in Pen-Based User Interfaces Joseph J. LaViola Jr. Ink Preprocessing and Preparation Lecture #5: Preparing Ink 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. m i i i i n s s s S n i t y x p p p p s ... 1 ), , , ( where ... 2 1 2 1 = = = Representing Data Points and strokes Image pixel matrix not as popular (x 1 ,y 1 ,t 1 ) (x n ,y n ,t n ) Fall 2008 CAP 6938 Topics in Pen-based User Interfaces Joseph J. LaViola Jr. Preprocessing Often required to clean raw data Stroke Invariance scale position orientation slant/skew order/direction Filtering and Smoothing Dehooking Normal view of stroke Zoomed in view of stroke showing unwanted cusps and self-intersections 3 Fall 2008 CAP 6938 Topics in Pen-based User Interfaces Joseph J. LaViola Jr. Scale Invariance Why? want to ensure stroke has a canonical representation so its size makes no difference in recognition Approach define constant width or height scale stroke maintaining aspect ratio...
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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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preprocessing - 1 Fall 2008 CAP 6938 Topics in Pen-Based...

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