security - How to extract fingerprints from biometric device? -


i wanted know can scanned image of finger prints? once user scan image biometric machine, able image of it?

device dermalog, asking testing.

fingerprint readers not work (paper) scanners, never store (or scan) image of finger. comes out bunch of bytes of data, compared stored values clever algorithms allow deviation (because scanned bytes never same, finger off, , it's analogue @ level anyway).

so short answer no, can't image, that's never stored, or acquired, device.


-

Comments

Post a Comment

Popular posts from this blog

sql - MySQL - Finding Empty relations -

i trying work out how full list of team leaders , team members our tables. including team leaders have no team. we have basic data structure have table person contains our basic person object. people extend table in details table. one of extended pieces of information have team_leader status. have 2 relevant details define this: detail_isteamleader , detail_teamleader . first boolean , defines short list of team leaders. second defines persons team leader (ideally subset). _person table_ person_id person_name _detail table_ detail_id detail_person_id detail_isteamleader detail_teamleader i can team leaders have team using following query: select tl.person_id tlref, tl.person_name tlname, per.person_id perref, per.person_name pername detail left outer join person per on detail.person = per.person_id left outer join person tl on detail_teamleader = tl.person_id order tlname, psname however, fails team_leaders detail.isteamleader true not occur in detail_teamleader...
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js ...
Read more

c - Android and JNI real time clock -

i got problem mini android application , use of real time clock signals in c (jni) function. it seems android ui doesn't real time signals timers instanced in c function. in following poc , timer trigger signal 5 times per second , if signal triggered while ui updating, application crashes. if don't start timer => no crash if don't put on ui => no crash i wrote little poc evidence behaviour. java part call jni function , put button on screen. public class mainactivity extends appcompatactivity { button bt; static { system.loadlibrary("testtimer-jni"); } /* jni ingresso */ public native void jnistarttimer(); @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); jnistarttimer(); /* load button */ bt = new button(getbasecontext()); setcontentview(bt); } } and main.c file content. timer instanced , starte...
Read more