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Vision-based Interaction

Vision-based Interaction. Scott Klemmer 17 November 2005. cs 547: Blake Ross and Asa Dotzler. Mozilla: Creating simple software in a geek-driven culture. The first vision-based interface. Myron Krueger used computer vision to create Responsive Environments (1970s) “Reaction is the Medium”

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Vision-based Interaction

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  1. Vision-based Interaction Scott Klemmer 17 November 2005

  2. cs547: Blake Ross and Asa Dotzler Mozilla: Creating simple software in a geek-driven culture

  3. The first vision-based interface • Myron Krueger used computer vision to create Responsive Environments (1970s) • “Reaction is the Medium” • http://www.artmuseum.net/w2vr/timeline/videoplace_video.html

  4. How it works • Video and background are separated in analog using chroma key techniques(think broadcast news) • The first and last points of each raster are stored in the computer, and represent the person’s outline

  5. Vision-based UIs: “Verbs” • Detecting and Tracking elements of a certain type in a scene • Capturing contents of detected objects • Recognizing individual members in an object class

  6. Vision-based UIs: “Verbs” • Detecting and Tracking elements of a certain type in a scene

  7. Vision-based UIs: “Verbs” • Capturing contents of detected objects

  8. Vision-based UIs: “Verbs” • Recognizing individual members in a class

  9. Vision-based UIs: “Nouns” • People (one or multiple) • Bodies • Faces • Hands • Documents • Objects

  10. Vision-based UIs: “Nouns” • People (one or multiple) • Bodies • Faces • Hands • Documents • Objects

  11. Vision-based UIs: “Nouns” • People (one or multiple) • Bodies • Faces • Hands • Documents • Objects

  12. I N F R A S T R U C T U R E Background Subtraction

  13. Image Moments (of Inertia) • 0th moment is mass(total number of pixels)

  14. Image Moments (of Inertia) • 1st moment is center

  15. Image Moments (of Inertia) • 2nd moment is orientation

  16. Tools for Vision apps • Intel’s OpenCV • C API to highly optimized image processing functions (threshold, dilate, optical flow, …) • http://www.intel.com/research/mrl/research/opencv • Fast to run! Slow to develop • Great for vision folks; too low-level for app folks • Papier-Mâché • Java API (and to some extent visual UI) for vision (and other physical input) • http://guir.berkeley.edu/papier-mache • Fast to develop! Slow to run • Great for app folks; ~5 fps can sometimes be too slow

  17. Good Vision Books • Computer Vision: A Modern Approach • David Forsyth and Jean Ponce (2003) • Fantastic book; but goal is more theoretical understanding than practical application • Robot Vision • Berthold Horn (1987) • More focused on apps and interactive algorithms • Somewhat out of date

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