KeyAnalyser v0.5

4th March 2013 - Sheikh Mehdi

Changes:
=======
- Check to see if SD card is mounted ("Take Video" & "Process"), and if the video.mp4 file exists ("Process").
- Use cvCanny to determine key (within red area) rather than BT - more robert to lighting changes, and is better with lower resolution than BT (meaning less pixels to traverse).
- Added ability to determine tip profile of key, using angle between edges using cvHoughLines2. [Needs further testing to implement database]