Project Multi-Touch

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Project Multi-Touch

• Albert You
• Aditya Mittal
• Paul Ferrara
• Jim Wallace

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Overview

• Multi-touch hand gesture implementation onto a
  36x27 display
• Rear projection technology
• Motion Detection Algorithm
• Infrared LEDs detector

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Current Status
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Rear Projection

• Mirror angled at 45 degrees respect to floor
• Image reflects off mirror to screen above
• Projector raised to 0.6 meters above ground
• Tracing paper lined on bottom side of acrylic

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Webcam

• Negative film applied in between focal lens
• Gain increased through software tweaking
• 320x240 resolution
• Black/White display

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Table Adjustments

• Wheels
• L blocks
• Height up
• Furnishes

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Light Emitting Diode (LED)

• Improved LED strip design
• Reduces artifacts
• Reduces hover
• Electrical Tape

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Software, Drivers, Code

• Windows Hotkey
• Motion Detection Algorithm
• Compare Background Frame with Current Frame
• Pixel change count compares
• Erosion Filter reduce image noise from webcam
• SpriteCraft

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Power Supply

• V1 14.00 V
• V2 25.00 V
• Wires are connected properly

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System Checks

• Mirror angled 10 degrees from ground
• Webcam placed in center directly beneath the
  screen
• Projector raised to 0.6 meters above ground and
  angled toward mirror on the ground

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Hover Test

• Hover hand with circular motions 1 above screen
• Observe output for hover artifacts

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Finger Output

• Place three to five fingers on the board in a
  clicking motion
• Observe output
• Switch constantly between one to five finger
  clicks and observe output

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Questions?