preprocessing - 1 Fall 2009 CAP 6105 – Pen-Based User...

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Unformatted text preview: 1 Fall 2009 CAP 6105 – Pen-Based User Interfaces ©Joseph J. LaViola Jr. Ink Preprocessing and Preparation Lecture #5: Preparing Ink Joseph J. LaViola Jr. Fall 2009 Fall 2009 CAP 6105 – 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 2009 CAP 6105 – 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 2009 CAP 6105 – 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 2009 CAP 6105 – 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 ¢ choose constant width or height based on stroke...
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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.

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preprocessing - 1 Fall 2009 CAP 6105 – Pen-Based User...

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