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Gesture Recognition System

Gesture Recognition System

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Gesture Recognition System

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  1. Gesture Recognition System Chuck Brazzel Vic Mata Advisor: Larry Sieh

  2. Gesture Recognition • Gestures can be used to represent some complex action • Software can be programmed to recognize certain gestures • By correctly interpreting gestures, the software can signal to execute actions

  3. Interfacing • Gesture Recognition System was designed to interface with IVC robot • Gestures are used to signal for robot to move on-board camera • Gestures will allow better placement of camera to improve robot navigation through obstacle courses

  4. Requirements • To do

  5. Implementation • Gesture Recognition System uses a combination of hardware and software • Hardware is a touch screen FTIR (Frustrated Total Internal Reflection) setup • Software interprets input gestures and utilizes the open source AME patterns library available from Arizona State

  6. Implementation FTIR Touch screen Gesture Recognition Code (Laptop) Robot/ External Device

  7. Hardware • Gesture system uses a touch screen input device • Touch screen uses FTIR (Frustrated Total Internal Reflection) of IR light • AVRcam is configured to detect IR light • Camera data sent across RS232 line to laptop to pass to gesture code

  8. FTIR Touch Screen • FTIR setup uses a plexiglass sheet surrounded by IR LEDs • Some of the IR light is reflected internally within the plexiglass known as total internal reflection (TIR) • When a finger contacts the top of the plexiglass a portion of the light contacting this point becomes ‘frustrated’ • This frusterated IR light is reflected down at a 90° angle to be viewed by AVRcam

  9. Touch Screen Circuit • Touchscreen is surrounded by 30 LEDs • LEDs use about 100mA current and 1.4V voltage drop • Resistors were calculated at about 7 ohms

  10. AVRcam • AVRcam filters IR light and passes visible light • IR filter had to be removed and replace with visible light filter • Visible light filtering is important to reduce noise from ambient light sources (sunlight, fluorescent lights)

  11. Serial Interface • Camera interfaces via RS232. System requires a serial to USB interface. • Code was added to get data from serial port and convert to x,y coordinates • Gesture code uses x,y coordinates for gesture recognition

  12. Finished Touch screen • To do

  13. Data Transfer Update images later • AVRcam included blob tracking feature • Camera can be set to track a specific color and sends a set of coordinates of where it found it • For us, IR light shows up as white so we track points of white

  14. Data Transfer • AVRcam provides more data then needed. • Must determine which point is being tracked and pull out coordinates of the box bounding the blob • Center point of the box is calculated and this data is passed to the gesture code