lec8 prelim

lec8 prelim - Lecture 8: Sept 20, 10 HW2 due Sept 22 Last...

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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 1 Lecture 8: Sept 20, 10 • HW2 due Sept 22 • Last Class – Energy Minimization methods • Graph cuts – Edge Detectors • Today’s objective – Line fitting – Intro to Stereo
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 2 Edgels to Curves • Edge detectors give edge points or edgels • Curve is defined by an ordered list of points – Connected components (regions) do not necessarily contain order information Linking – Given an edge, find the next edge – Look for a neighbor in the direction of the edge (normal to gradient) • May impose constraints on continuity of edgel direction – If multiple choices available, select one • Based on local measures (direction/contrast continuity) • Global search (corresponds to finding best path in a connectivity graph)
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 3 Representation of a Curve • Chain (list) of points chain code records only change from previous point for compression • Fit lines (or some other curves) to the chain of points – Chain may not be fit with a single line or simple curve – Segment chain at “corners” • Iterative end point fit – Join first and last point by straight line – Compute maximum distance of points on the chain, segment at this point if error > threshold, Iterate –Examp le
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This note was uploaded on 11/23/2010 for the course CS 574 taught by Professor Ramnevatia during the Fall '10 term at USC.

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lec8 prelim - Lecture 8: Sept 20, 10 HW2 due Sept 22 Last...

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