Electrical and Computer Engineer Large Portable Projected Peripheral Touchscreen Team Jackson Brian Gosselin Greg Langlois Nick Jacek Dmitry Kovalenkov L3PT Midway Design Review ing

2 Electrical and Computer Engineering Project Overview Portable Large workspace Affordable Single / Multi user Multi touch capabilities No other product currently on the market meets all these specifications.

3 Electrical and Computer Engineering System Block Diagram

4 Electrical and Computer Engineering MicroVision SHOWWX Laser Pico Projector Small:.55” x 2.36” x 4.64” Light: 122g Resolution: 849 x 480 Image Size: 6” to 100” This projector provides the best resolution and size within budget.

5 Electrical and Computer Engineering Microsoft LifeCam vx-2000 Purchased for prototyping Processes up to 30 fps Removed visible light filter Replaced with IR longpass filter For the final design, we may need to upgrade to a faster camera to minimize delay.

6 Electrical and Computer Engineering Image Processing Touch locations correspond with brightest areas Distinguishes between touch pixels and background pixels Finds coordinates of touches Coding in C++ Utilizing OpenCV libraries

7 Electrical and Computer Engineering Image Processing – Algorithm # 1 Scans image for first touch pixel Records location of touch Draws black circle to cover brightest region Saves touch coordinates Sometimes more than 1 coordinate per touch Very fast and simple

8 Electrical and Computer Engineering Image Processing – Algorithm # 2 Finds bounding rectangle of touch region Assigns center of rectangle as the touch location Always only 1 coordinate per touch More complex and slower than algorithm 1

9 Electrical and Computer Engineering Speed Of Image Processing

10 Electrical and Computer Engineering Windows 7 Driver  Communicates touch coordinates to operating system  Dependent on image processing  Main focus for the spring semester

11 Electrical and Computer Engineering Calibration  Adjust the size of projected screen  Touch four corners to define the screen boundary  Map image coordinates to projected coordinates

12 Electrical and Computer Engineering Infrared Emitting Pens Components: Switch Infrared LED 120Ω Resistor AAA Battery Battery Life: Capacity of 1000 mAh 3.1 mA drawn by pen Life: hours

13 Electrical and Computer Engineering Physical Assembly Stable base supports projector and camera at a height up to 3.5’ Designed to support adjustable heights for projector and camera Handle for portability Top opens for storage

14 Electrical and Computer Engineering Midway Design Review Goals  Choose detection method IR emitting pens  Position of projector and camera In front and above  Use camera to detect infrared light Camera with IR longpass filter  Extract coordinates of touch locations Image processing algorithms

15 Electrical and Computer Engineering What’s Next?  Determine whether or not a dedicated signal processing chip is necessary  Windows 7 driver  System calibration

16 Electrical and Computer Engineering Updated Gantt Chart

17 Electrical and Computer Engineering Conclusion  Met all midway design review goals  On track to complete L3PT by scheduled deadline DEMO