1. Group 4 Alix Krahn Denis Lachance Adam Thomson
Multi-touch Table
Group 4
Alix Krahn
Denis Lachance
Adam Thomson
Introduce group members and any parts of project each person has led
Adam – physical set-up done and a bit of hardware
Alix – vhdl and physical set-up
Denis – software drivers and image processing (camera)

2. What does it do?
Multi-touch interface to control software and applications
Intuitive, natural gestures and natural interface to use computer
Useful for collaboration and learning, particularly with children and people who are disabled

3. How does it do it?

4. Infrared Touch Event

5. How does it do it?

6. Picture Captured by USB Camera
NEED PIC HERE

7. How does it do it?

8. Picture sent to DE2 Via USB cable INTERESTING CHALLENGES HERE
Webcam to Board Data Rate
Data rate (measured on computer) ~0.7MB/s
Below the data rate max for the USB (1.5MB/s)
Interesting challenges here

9. How does it do it?

10. Post Digital Signal Processing
Pic of DSP

11. How does it do it?

12. Data sent to computer by ethernet
For each frame sent by the webcam, data for ten touch points is sent to the computer.
Each touch point contains three integers: an x location, a y location, and the size of the touch point.

13. What’s on the computer? Receives position frames from the board
Calibrates to the screen size
Uses absolute points to control the software
Finds gestures using differences in position of touches from frame to frame

14. Hardware Diagram

15. What’s special? Challenges Unique peripherals Using common I/O – USB
Digital signal processing
Using USB – creating a new controller and driver
Creating physical table and compliant surface
Challenges