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Development of Vision-Based Navigation for a Robotic Wheelchair

Development of Vision-Based Navigation for a Robotic Wheelchair. Matt Bailey, Andrew Chanler, Mark Micire, Katherine Tsui , and Holly Yanco University of Massachusetts, Lowell Bruce Maxwell Swarthmore College. Outline. Goal Redesign of Wheeley SLAM using stereo vision Human cue detection

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Development of Vision-Based Navigation for a Robotic Wheelchair

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  1. Development of Vision-Based Navigation for a Robotic Wheelchair Matt Bailey, Andrew Chanler, Mark Micire, Katherine Tsui, and Holly Yanco University of Massachusetts, Lowell Bruce Maxwell Swarthmore College

  2. Outline • Goal • Redesign of Wheeley • SLAM using stereo vision • Human cue detection • Manipulation • Future work

  3. Goal: How do I get to…? Photo from http://lib.store.yahoo.net/lib/umallvt/umall-directory-2006-05-26.gif

  4. Wheeley: Hardware • Wheelesley v2 • Vector Mobility prototype chassis • Differential drive • RobotEQ AX2850 motor controller • Custom PC • Sensor platform • Vision system

  5. Wheeley: Robot Arm • Exact Dynamic’s Manus Assistive Robotic Manipulator (ARM) • 6+2 DoF • Joint encoders, slip couplings • 14.3 kg • 80 cm reach • 20 N clamping force • 1.5 kg payload capacity • Keypad, joystick, single switch input devices • Programmable Image by Exact Dynamics

  6. Wheeley: Vision System • Manipulation • Shoulder camera • Canon VC-C50i • Pan-Tilt-Zoom • Gripper camera • PC229XP Snake Camera • 0.25 in x 0.25 in x 0.75 in

  7. Wheeley: Vision System • Navigation • Videre Design’s STH-V1 • 19 cm x 3.2 cm • 69 mm baseline • 6.5 mm focal length • 60 degrees FoV

  8. SLAM using Stereo Vision • Why use vision instead of traditional ranging devices? • Accuracy • Cost • Detail

  9. Phission http://phission.org Videre Design’s Small Vision System (SVS) Simple Mapping Utility (pmap) Laser stabilized odometry Particle-based mapping Relaxation over local constraints Occupancy grid mapping Vision and Mapping Libraries

  10. SLAM Data Flow

  11. Results

  12. Human Cue Detection • Swarthmore Vision Module (SVM) • Basic text detector and optical character recognition

  13. Manipulation: Visual Control

  14. Manipulation: Experiments • Able bodied, August 2006 • Confirmed: With greater levels of autonomy, less user input is necessary for control • Confirmed: Faster to move to the target in computer • Unconfirmed: Preference of visual interface • Target audience, Summer 2007 • Access methods • Cognitive ability • Recreation of previous experiment

  15. Future Work • Additional Wheeley modifications: • PC for mapping • Mount touch screen LCD • New Videre Stereo Head • Mount robotic arm • Integrate Wheelesley navigation

  16. Acknowledgements • Research supported by NSF grants IIS-0546309, IIS-0534364, and IIS-0415224 • Collaborators: • David Kontak at Crotched Mountain Rehabilitation Center • GertWillem Romer at Exact Dynamics • Aman Behal at the University of Central Florida

  17. http://www.cs.uml.edu/robots Questions?

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