The SDKs that come with most scanners are optimized for 1:1 matching. Their performance on 1:1 is only reliable on small record; say 5,000 fingerprints. For fast 1:N matching, you'll have to purchase a commercial solution e.g. ExpressID which claims to match upto 700 Million records per sec on an optimized server. But that comes at a price. This is what equity is currently using for their identification system. If your financial power is wanting, then http://www.sourceafis.org/ is your friend. It has a respectable matching speed of about 20K-40K fingerprints per sec on a decent computer. 

On 2 September 2016 at 11:46, Ndungi Kyalo via skunkworks <skunkworks@lists.my.co.ke> wrote:

@Chigiri,

Take a good look at libfprint. There is a list of libfprint supported devices here.  ​The reason the device could not be detected in Ubuntu or Debian is because there are no kernel devices for these scanners. So how does libfprint do it with ko modules? It uses userspace drivers (written by contributors) which work via libusb. 1:N matching is usually implemented by looping through, which is basically a 1:1 attempt at matching repeated many times.

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