On Tuesday 20 November 2007, you wrote: > 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
Thanks for the tips. At first, I was not using enough pressure to get a good complete image. Then, it seemed that I was approaching the scanner at various angles, sometimes getting an image of the very tip and missing the whorl. Now I am trying to hold my finger more parallel to the scanner as I press. This seems to give me a more consistent result. Nonetheless, I still get some rejections and the images in fprint_demo look surprisingly good. The number of minutiae detected varies between less than 40 to 70 or so. While writing this, I have been experimenting some more with fprint_demo. I notice that there are relatively few minutiae near the tip of my finger and quite a few near the back edge of the image. I think that if I miss just a little of that further back area, it might change the match quite a bit. _______________________________________________ fprint mailing list [email protected] http://lists.reactivated.net/mailman/listinfo/fprint
