Team 22 Project-Virtual Whiteboard

Concept & Motivation Whiteboard is convenient, but you can’t carry it around. Writing/Drawing in software is useful, but hard to draw with mouse Why not combine them? A portable projected whiteboard. – Collaborative projected virtual whiteboard – Link together through internet – Share work with others around the world – Projected, can set up using any flat surface

Competitive Analysis Conventional Whiteboard Wii Virtualboard Web Whiteboard Collaborative V-Board Portability ✖✔✔✔ User Friendliness ✔✖✔✔ Collaboration ✔✔✔✔ Writing Quality ✔✖✖✔ Scalability ✔✖✔✔ Ease of Setup ✖✖✔✔

Requirements Trackable light source – LED device trackable by a smartphone camera Fixed boundary light source – LED devices at the four corners to indicate projected board boundary Smartphone – Perform image processing from captured video – Render LED sources Central server board – Process rendered output from smartphone into a display – Connect to the internet and communicate with other Virtual Whiteboards Projector – Project information from server board Each server board creates a local virtual whiteboard. Server boards connect together through internet.

Technical Specifications Hardware: – LED pen (act like a marker) CLIENT END Red/Purple LED light 9V battery, 9V battery cap Resistors – Android phone (for image capturing and some image processing) CLIENT END – BeagleBoard-xM (for combining clients’ information) SERVER END – Projector/screen (display output) Software: – Android SDK 2.3 (Phones/Clients) – Ubuntu/C (BeagleBoard-xM) – USB Driver, libusb Protocols: – USB – Wi-Fi – VGA/DVI video output (from BeagleBoard to projector)

Architecture BeagleBoard (Construct output) BeagleBoard (Construct output) Phone (capturing & processing images) Phone (capturing & processing images) LED Pen (light source) LED Pen (light source) Light Client End 1 Phone (capturing & processing images) Phone (capturing & processing images) LED Pen (light source) LED Pen (light source) Light Client End 2 …... Server End USB/Wi-Fi Projector VGA/DVI

Risk & mitigation plan Riskmitigation plan Communication between phone and board does not work No mitigation plan, this is the key component of our project. Wi-Fi communication between multiple boards does not work Seek alternate communication protocols through smartphones Significant lag between user input and board output Redistribute workload between the smartphone and the board. Smartphone may not be able to pick up LED information correctly Write a better algorithm to track the LED LED is not bright enough to be picked upUse a laser as the light source. Concurrency problem between multiple boards Introduce more locking, trade speed for correctness