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M.S. Thesis Defense: Alexander Cramer
Wednesday, April 9, 2014
4:00 p.m.
AVW 2328
For More Information:
Maria Hoo
301 405 3681
mch@umd.edu

ANNOUNCEMENT: M.S. Thesis Defense

Name: Alexander Cramer
Committee:
Professor Rama Chellappa
Professor Larry Davis
Professor Chris Davis
 
Date/Time: Wednesday, April 9, 2014 at 4pm - 5pm
Location: AVW 2328
Title: VISION ALGORITHM FOR THE SOLAR ASPECT SYSTEM OF THE HIGH ENERGY REPLICATED OPTICS TO EXPLORE THE SUN MISSION

Abstract:

This work covers the design and test of a machine vision algorithm for generating high-accuracy pitch and yaw pointing solutions relative to the sun on a high altitude balloon. It describes how images were constructed by focusing an image of the sun onto a plate printed with a pattern of small cross-shaped fiducial markers. Images of this plate taken with an off-the-shelf camera were processed to determine relative position of the balloon payload to the sun. The algorithm is broken into four problems: circle detection, fiducial detection, fiducial identification, and image registration. Circle detection is handled by an "Average Intersection" method, fiducial detection by a matched filter approach, and identification with an ad-hoc method based on the spacing between fiducials. Performance is verified on real test data where possible, but otherwise uses artificially generated data. Pointing knowledge is ultimately verified to meet the 20 arcsecond requirement.

This Event is For: Graduate • Faculty

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