lec11

lec11 - Lecture 11: Sept 29, 10 HW3 due Oct 6 Questions?...

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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 1 Lecture 11: Sept 29, 10 • HW3 due Oct 6 – Questions? • Last Class – Global correspondence methods • Dynamic programming • Graph cut methods – Two missing slides added to class notes • Integration with segmentation • Today’s objective – Structure from Motion
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 2 Swap and Expansion Algorithms Outer loop is termed a cycle, inner loop an iteration. Finite number of cycles are needed, experiments indicate most improvement occurs after the first cycle
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 3 Applications of Stereo • Navigation – Mars rovers – For terrestrial applications, trade-off with laser ranging systems • Aerial mapping – Moving aircraft naturally provides multiple images – Satellite imagery: typically has a line sensor, motion is used to create the 2-D image, multiple views are acquired from different orbits of the satellite. – Has been most effective for terrain mapping; built up areas are more challenging due to large disparity changes • People detection in videos • Industrial applications • Many commercial systems available, e.g. http://www.pointgrey.com , http://www.tyzx.com
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 4 Limitations of Stereo • Range accuracy falls off with distance; limitations on acceptable baseline for practical applications • Accurate matching in complex scenes remains difficult • Global correspondence methods tend to be slow
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USC CS574: Computer Vision, Fall 2010 Copyright 2010, by R. Nevatia 5 Working With Un-calibrated Cameras • Standard stereo methods assume that cameras are calibrated (intrinsic and extrinsic parameters are known) – 3-D positions can then be inferred by “triangulation”
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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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lec11 - Lecture 11: Sept 29, 10 HW3 due Oct 6 Questions?...

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