Re: Artificiqal Intelligence

On Thu, 22 Aug 2024 15:34:49 -0500, AMuzi <am@yellowjersey.org> wrote:

On 8/22/2024 2:56 PM, Jeff Liebermann wrote:

On Wed, 21 Aug 2024 23:13:29 GMT, cyclintom <cyclintom@yahoo.com>
wrote:
 

You all know that your thumbprint is lucky to be recognized one out of 20 times.

 
I don't use my thumb for biometric authentication on my smartphone,
laptop, or flash drive (Verbatim).  Instead, I program the fingerprint
reader to authenticate using my index and middle fingers, on both
hands.  (It's not called a thumbprint reader).  There are multiple
reasons for not using the thumbs.  Using the thumbs produces a general
lack of reliability due to the relatively small working area on the
sensor, compared to the rather large thumb area.  Finding the correct
location on your thumb is awkward and difficult.  Little wonder your
batting average is so low.
 
Of the various fingerprint readers I use, the one in my Moto G Power
(2020) is the one I use the most.  I would estimate that I use at
least 70 times per day when working.  The sensor is on the back of the
phone, so I just wrap my fingers around the phone and authenticate. No
need to turn the phone on in advance because the fingerprint sensor
detects my finger (from it temperature) and turns the phone on
automagically.
 
The reason why I have 2 fingers on each hand programmed is because I
sometimes it doesn't work very well when my hands are dirty.  It's
also handy to be able to use either hand.
 
The only time it hasn't worked at all was when I was cleaning chainsaw
parts with solvent and leaky latex gloves.  The solvent (acetone?)
wiped out most of my fingerprints.  None of my fingerprints would
work.  I tried washing and drying my hands, but the fingerprints
remained hidden.  I switched to password security until my
fingerprints began reappearing.  I had to reprogram the phone with all
4 fingerprints every 2 days for about 10 days when the fingerprints
finally stopped changing.  Hint:  Don't do that.

I have no experience there, but is that because your fingers
were exceptionally clean, such that an optical reader
couldn't discern the pattern?

No.  When the phone is setup for fingerprint identification, the user
is instructed to put their finger on the fingerprint scanner.  After
the scanner records the fingerprint, the user is instructed to rotate
their finger.  The scanner scans that and combines it with the
previous scan.  This is repeated until the finger is rotated through
the full 360 degrees.  The result is that this finger can now be
applied to the scanner at any angle and that the scan is larger than
the sensor, so that the sensor can be positioned almost anywhere on
the sensor.

My fingerprint sensor is on the back of the phone.  However, some
phones use the power button as a fingerprint sensor.  Programming
these require a different procedure that does not involve rotation.
There are some YouTube videos showing how to program a phone that does
not involve rotation.  I consider that to be a bad idea (except for
fingerprint sensors on the power button). 

My Moto G Power (2020) will record up to 8(?) fingerprints.  They can
be 8 of my fingers.  Toes do not work (I've tried it).  They can also
be fingerprints from several different people.  I advise parents to
add their fingerprints to their kids phones.  I've added my
fingerprints to various customers phones because it's convenient when
they ask me to fix their phone or tweak the phone settings.

Not all fingerprint sensors are the same.  Some have a contact
thermometer to measure skin temperature which prevents someone from
making a rubber fingerprint facsimile.  Some have a pulse sensor
(microphone) for the same purpose.  Some have an IR camera, which
records the pattern of blood vessels, which are as unique as
fingerprints.

The problem with using the thumb is a mismatch between the large
diameter of the thumb print, compared to the smaller finger print
sensor on the back of the phone.  Unless the initial scan covered all
of the thumb print, it is likely that the thumb will be positioned in
an area that was not scanned and the scan will fail.

Incidentally, I checked in via my phone to a doctors appointment on
Thurs.  In order to login to the hospital system, I used my
fingerprint (twice).

--
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558