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A Lightweight Computer Vision-based Electronic Travel Aid Andrew B. Raij Enabling Tech Project Status Report 3/6/2003.

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Presentation on theme: "A Lightweight Computer Vision-based Electronic Travel Aid Andrew B. Raij Enabling Tech Project Status Report 3/6/2003."— Presentation transcript:

1 A Lightweight Computer Vision-based Electronic Travel Aid Andrew B. Raij Enabling Tech Project Status Report 3/6/2003 Department of Computer Science, UNC-Chapel Hill

2 High-Level (Long Term?) Goal Inexpensive, lightweight device that assists with orientation and mobility (O&M) Gathers spatial data from the environment with one or more cameras and presents it to a blind user in a useful form

3 Big Questions (1) Why Cameras? NxM 2D grid of intensity / color data Find edges, other features Lots more information than ultrasound, infrared lasers, etc Wide field of view (particularly when using several cameras) Can extract long-range depth from the world (as opposed to 3-6 ft. of a cane) No need to scan the world like a cane Cameras are getting cheaper and cheaper

4 Big Questions (2) What data to gather? Intensity / Color Depth * Cane is too short Cane does not help much for high objects Patterns (brick, tile, marble, etc?) Faces Objects

5 Big Questions (3) How to transform visual data to useful information? Auditory Don’t want to affect ability to listen to the world Tactile Other?

6 Big Questions (4) How to do it fast on a small, lightweight device? Hardware Requirements Floating point ? Low heat, power Inexpensive Cameras and Camera Interface (Firewire? USB?) Possibilities PDA – no floating point, useless video display Mini PC

7 This Semester Do a lot of Learning / Reading Perception of the world by the blind Existing O&M “Devices” Existing O&M work using computer vision Experiment with Multiple View Geometry concepts Two-View Geometry Mirror Stereo Look into inexpensive, lightweight hardware platforms Begin implementation


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