Re: What is the most difficult search operations for criminal finger print

Hi Paul,
256 bytes is an example, I don't care about its data length. But after encoding, a fingerprint data should reasonally be within its range.

Weng

paul c wrote:
> wtxwtx_at_gmail.com wrote:
> > Hi,
> > I am a newbie in database theory, but I think it cannot prevent me from
> > making some contributions to the field, not in theory, but in database
> > performance. That is, what I am interested in the database is how to do
> > match, not its interface or its language. Is it the right place to ask
> > the question?
> >
> > It is often read that a criminal finger print got a match in FBI
> > criminal finger print database through several months waiting period.
> >
> > The following questions arise from my mind:
> > 1. What is the most difficult search operations for criminal finger
> > print database?
> >
> > 2. Could someone give an example on what happened over there?
> >
> > 3. The finger print database is closely linked to a finger print
> > encoding. While doing search, finger print picked up from the field is
> > used to generate a match pattern, then the encoding method determines
> > how the match pattern is generated. Finally the match pattern is used
> > to scan all database data to see if there is any match between one of
> > stored finger print data with match pattern data. That means, for
> > example, one full set of finger print needs 256 bytes, a match pattern
> > has same 256 data, then a comparison is made between the 256 bytes to
> > see if they are matched with some bit comparison results are masked or
> > some bits are masked before doing match. In search process, I think
> > there is no need to know how finger print is encoded. Is it correct?
> >
> > 4. Essentially what I really want to know is what operations are needed
> > to implement the process? For example, there are 256 bytes finger print
> > data, and there is a part of finger print picked up from the criminal
> > field.
> >
> > Thank you.
> >
> > Weng
> >
>
> i think this is one logical/'right' place. also that the question is in
> the domain of 'domains'! eg. what does 'equal' mean.
>
> that is intriguing about a finger-print only taking 256 bytes. never
> knew that.
>
> p
Received on Wed Jan 11 2006 - 12:56:19 CET