[fprint] Great job!

[Daniel Drake]

Mark Vytlacil wrote:
> I had just about given up hope that you would get past the export hurdle. It 
> works great! I am using the microsoft reader. I am still getting used to 
> putting my finger on the reader in a consistant manner. It helps to press a 
> little. A configuration option for matching threshold might be nice; maybe 
> in /etc/fprint. I put 3 copies of the fprint line in my pam file so that it 
> gives me 3 chances to match.

I feel you should be getting a better experience from this scanner. It 
works very well for me, but maybe I've just become an experienced 
scanner. Anyway, a few tips:

Attempt to put your finger on the sensor fast -- don't put it lightly 
and then improve the pressure, try and put a decent of pressure on 
immediately (not too much though). Although the software will pause 
until you actually remove your finger from the sensor, it will only scan 
your finger once *immediately* when it detects the initial pressure, and 
it will not resample. (in future we'll improve the software to take a 
few samples of the finger and use the best one)

Clean the sensor with sellotape or blu-tak and then get a good 
enrollment image. Use fprint_demo to enroll as it gives you visual 
indication of what the scan looks like and also the enhanced/binarized 
version.

The only time I've had a false rejection from this sensor/driver is when 
I have accidentally rotated my finger to a fairly significant degree. 
This has only happened once or twice during all my testing.

Thanks for the feedback,
Daniel