The blob type issue is not a problem for me, but the hardware-specific generated code can be a problem, i need a hardware-independent representation, i can't guarantee that all readers will have the same brand. So the better way would be image based data, right? Does not exist any kind of tool or algorithm which can extract some kind of portable code from a fingerprint image? Thanks for answering me.
Regards, José Trancas On Fri, Nov 21, 2008 at 1:51 PM, Artem Egorkine <[EMAIL PROTECTED]> wrote: > Yes, you're right, fp_print_data_get_data() is the correct way. What you > get back is a binary blob and if you need a string-safe representation of > it, you better encode it via base64-encoding or similar. On the other hand, > most databases handle binary blobs nowadays, so I don't see a problem. > The size of the data blob will vary with the scanner hardware, I think. > Maybe Daniel would have an estimate of it's maximum size. > > Also, bear in mind that the data you get from the function mentioned above > is hardware-specific. There is no way to get fingerprint data that is > compatible with both Microsoft fullfingerprint scanner and, for example, > Upeks Touchstrip scanner. > > Regards, > Artem > > On Fri, Nov 21, 2008 at 1:10 AM, Zé Carlos <[EMAIL PROTECTED]> wrote: > >> Hello there, i'm new to fingerprints systems, i'm developing an >> authentication system and i would like to add fingerprint authentication >> using libfprint, but all data would be stored on a database, my >> authentication system would be distributed among some terminals, and >> connectivity to the central database probably wont be the best and fastest. >> So, if possible, I would like to convert fingerprint to a database storable >> string which could be compared for identification and verification. >> I saw on the API that exists fp_print_data_get_data which can convert a >> struct fp_print_data into an array of chars representation, i didnt tested >> (because of some impossibilities libfprint yet, are these string >> representations suitable for database storage? and for identification >> through a database system query like" "select * from user where >> fingerprint='some-fingerprint-data'"? what size can that string reach ? >> Sorry by bothering with these kind of questions, if someone could help me >> i would apreciate it very much! :-) >> >> my best regards, >> >> José Trancas >> >> _______________________________________________ >> fprint mailing list >> [email protected] >> http://lists.reactivated.net/mailman/listinfo/fprint >> >> >
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