Biometric database
~~~~~~~~~~~~~~~~~~

The database is composed of:
	* signatures
	* video

Signatures:
~~~~~~~~~~~

Signature files are composed of comma separated integer values, with:

X,Y,pressure,time 

denoted X,Y,P,T from now on.

X can take values in the interval of 0 to 1xxxx.
Y can take values in the interval of 0 to 7yyy.
P can take values in the interval of 0 to 511.
T is measured in ms and always starts on 0.

Pen ups are denoted with X=-1,Y=-1,P=-1, and arbitrary T value, take this
into account when building statistical models, because X=-1,Y=-1 is not a
"real" spatial coordinate of the signature.

 * Capturing Device:

Wacom "Graphire3 4x5" digitizer tablet. Sensing surface 127.6mm x 92.8mm.
Spatial reolution is 2032 lpi (lines per inch). 512 different pressure
levels. Sampling rate is about 100Hz (varying).
http://www.wacom.com/graphire/4x5.cfm


Video:
~~~~~~

Videos are Mpeg-4 coded.
Coder : MPlayer - "The Movie Player" (http://www.mplayerhq.hu). 
Version : MPlayer-mingw32-1.0pre7, for Windows.

There are perl scripts for extraction of audio and still pictures from the
videos, extraction of audio takes significantly less time than picture
extraction.

 * Capturing Device:

Allied Vision Technologies AVT marlin MF-046C 10 bit ADC, 1/2" (8mm) Progressive scan SONY IT CCD
http://www.alliedvisiontec.com/indexc.php?p=91&t=produktinfos&o=3&a=sp


		
