Concept
Motivation
Competition
Tech Specs
Requirements
Architecture
Use Cases
System States
Risks
Error Handling
Implementation
Test Cases
Evaluation
Lessons
Fun Stuff
References
18-549 Home

TEAM 5: Action Seeker
Spring 2008

MEMBERS

Vivan Shah
Jeff Mori
Shauna Ormon
Sue Lai

PROJECT CONCEPT

A visual and interactive hand-held device to aide football fans in viewing every angle of the game action, no matter where they are seated in the stadium
The LCD touch-screen will make it easy to switch camera angles and allow the user to view instant replays.
Integrated live feed of Yahoo fantasy football stats into the device.
Hardcore fans could buy this product, and the casual fan could rent the product on a game-by-game basis.

MOTIVATION

Gives fans something to do between plays & during commercial breaks
Helps out those in distant seats
Provides an interactive element to football games

COMPETITIVE ANALYSIS

People can get stats and maybe short clips on their cellphones. Angles and clips are predetermined by third parties
Advantage: user gets to control which camera they want to see
Advantage: Fantasy football stats integrated into the device, users can see the stats of their fantasy team in real time.

TECHNICAL SPECIFICATIONS

Hardware:

Nokia N770 internet tablet (runs on linux)
400mhz ARM cpu
PC Server for transcoding and streaming
USB-connected web cameras for testing
Wireless router

Software:

Software "Multiplexer" to manage multiple input and output streams
User interface on handheld device
audio/video codecs for compression

Protocols:

802.11 Wireless Lan

REQUIREMENTS

Fantasy Football stats integrated into the UI and updated after each play
User can view thumbnail views of each camera angle
Switching of camera angle at will
For each camera, have the option of viewing a replay of the last play

ARCHITECTURE

architecture

USE CASES (INTERACTION DIAGRAMS)

use cases

SYSTEM STATES & TRANSITIONS

To be completed.

RISKS & MITIGATION STRATEGIES

RISKS	MITIGATION
Security across WLAN network	Static IP/MAC address filtering and WPA encryption
Delay in switching between different sources	Add buffering feature to all live feeds
Live feed latency	Increase buffering capacity on the live feeds
Signal Strength	Localize wireless access points to seating “zones”
Server Overloading	Designate video streaming servers to seating “zones”

ERROR HANDLING

To be completed.

IMPLEMENTATION DETAILS

To be completed.

TEST CASES

Application Startup (homepage appears)
Icon link functionality (latency)
Local movie playback (different bitrates)
Wireless streaming quality (different bitrates)
From movie back to homepage (quits gracefully)
Quit program from homepage

EXPERIMENTAL EVALUATION (Metrics)

Responsiveness of User Interface
Video Quality
- Resolution -> 320x240 or 640x480
- Bitrate -> 128kb/s to 1024kb/s
Buffer Size
- Large Buffer (300ms)-> Avoids jitter
- No Buffer (0ms)-> Avoids drift
Latency
- Webcam to Laptop -> Transcoding
- Laptop to N770 -> Streaming
CPU Usage

LESSONS LEARNED

To be completed.

FUN STUFF

Theme?

REFERENCES

Project Proposal and Requirements, Team Project Presentation, February 1, 2008
Design & Architecture, Team Project Presentation, February 15, 2008
Mid-semester Project Status, Team Project Presentation, Date TBD
Test Plan & Experimental Validation Team Project Presentation, March 28, 2008
Final Project Presentation, Team Project Presentation, Date TBD
Project Poster, May 2, 2008

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