1. How Fingerprint Scanners Work
Name:Ryo Obata
No:s1150052
1. Introduction to How Fingerprint Scanners Work
Without dozens of years are going to pass after the fingerprint
authentication function came to be equipped with by a computer,
however being used only at a place handling high information
technology for the dozens of years; of the generalization was not
done.
However, during these past several years, as for the fingerprint
authentication function, it came to be supposed at every place.
The high technique called this fingerprint authentication is used
at the many places including the lock function of the keyboard of a
police station and the PC or the apartment and provides safe
security for our life.

2. 2. Fingerprint Basics
The human lasting fingerprint is one of the strange things. I
have the identification card which can completely prove one
oneself who the human being is made accidentally, and cursed it
on a finger-tip. These are the existence that I had on a finger by a
specific reason.
I give an order to a fetus growing by genetic code of DNA, and
the human body changes it into the figure which makes the
human being the human being. However, a fingerprint is
completely a random element and is the strange existence that I
do not resemble closely even if I meet by the relations that the
blood leads to.

3. 3. Optical Scanner
A fingerprint scanner function includes two basic work. It is a
function I agree with the form of the finger-tip as a pattern from
the image that got it being necessary to obtain a fingerprint
beforehand and the form of the finger-tip which I obtained
beforehand, or to recognize.
When it gets the image of the finger, there are some recognition
methods, but it is an optical reader with the CCD cameras
recently to become mainstream. These are things used in a digital
camera or a video camera, and a scan begins when I put a finger
to the glass plate and I print the place that is gloomy to light up
the upheaval of the fingerprint of the finger and a bright place
clearly and can arrest you.

4. 4. Capacitance Scanner
The fingerprint scanner to grind like an optics scanner starts a
mountain and the image of the valley to make a fingerprint.
However, not print using the light for, the condenser scanner is
going to catch the image of the fingerprint by canceling an electric
current. The sensor consists of a semiconductor chip consisting of
a large number of small aggregate, and I am very than one of the
fingerprints one existing on a finger small, and the electric
current recovering completely can thin them.
A war becomes as a fingerprint the part by reading the voltage
corresponding to each when the scanner recognizes a finger;
distinguish it whether do not come true. I let the form of the
fingerprint make ends meet as one piece of data by reading every
data with sensor sequence.

5. 5. Analysis
I generally use the shape of various fingerprints as form to
show by a movie or the TV program, but this is not the method
that is practical when I compare the form of the fingerprint.
Because I can let the shape see in the different form by comparing
it even if I use the thing of the same form, I cannot completely
compare it. In addition it is dangerous to use the data of the
fingerprint by a comparison to make that I steal the shapes of the
fingerprint preparation.
Therefore many fingerprint authentication systems compare the
specific characteristic part of the fingerprint. I authenticate a
target fingerprint precisely by I concentrate on it, and confirming
only a characteristic place parting to place that the line of the
fingerprint begins, and is over, two.

6. 6.Lots More Information
Some methods that can check whom security system appoints in
the user who admitted it exist. Most systems check security with
"lasting thing" "things knowing". It is an identification of
identification and is checked with passwords. However, I do not
necessarily wear these and I forget it in some cases and may not
wear it.
However, a fingerprint authentication does not have it. This is
because the human being cannot lose one of the human elements
called the fingerprint. These stigmata imitate it and help it in
security greatly because it is very difficult to forget it.