On Jun 25, 2008, at 11:41 AM, Mehmet Ali Akmanalp wrote: >
--- %< --- > > This is funny, I've been working on the exact same device. I guess > it's popular since it's cheaper than its counterparts or something. > Some tips: I've been working with the device out of the laptop > enclosure, with a usb cable soldered on. It seems to be harder to > make it enroll or verify properly when it's out of the enclosure, > since the plastic curved dent that guides your finger is not there. > It's a bit more consistent otherwise. Also, people with relatively > drier skin like me have a harder time getting the reader to detect > their finger properly. The hackish solution: lick your finger! > > ~ Mehmet Ali Akmanalp > Yes - it does seem hideously popular - it's hard to find a device suitable for my purposes that doesn't feature it. Talking to OEMs it seems that price and size and the features they desire, plus it does seem to work a little better under Windows with the Authentec proprietary code. I haven't tried it outside an enclosure. I have used the device on the Motion Computing C5 (damn near impossible as it is mounted on the thing edge of the device) and in the Data Ltd, Inc, DLI8300 (much better). I am able to get good scans every time (with practice), but end users have reported a great deal of difficulty in using it. Particularly it is very easy to enroll a fingerprint that you will never be able to verify against. I can also make libfprint segfault on demand by swiping my finger very quickly, or dabbing it on the device. My patch (in a previous mail) fixed this segfault and added additional error codes for wiping to fast or too slow. I have an additional issue that people may overlook when using this for personal reasons - I have to use this device to provide authenticated access to data capture system for clinical trials, that means this device has to be really secure and well tested. WIth the stock libfprint code I have (exactly once) achieved a false positive. I have to make the scanner more picky about what it calls a good scan and work to make simultaneously more secure and easier to use. An unenviable task I am sure you will agree! -- Geoffrey Teale Software and Technology Consultant, München [EMAIL PROTECTED] _______________________________________________ fprint mailing list [email protected] http://lists.reactivated.net/mailman/listinfo/fprint
