The scanner has its own light source, typically an array of light-emitting diodes, to illuminate the ridges of the finger. The scanning process starts when you place your finger on a glass plate, and a CCD camera takes a picture. See How Digital Cameras Work for details on CCDs and digital conversion. Typically, an analog-to-digital converter in the scanner system processes the analog electrical signal to generate a digital representation of this image. Collectively, the light and dark pixels form an image of the scanned scene (a finger, for example). Each photosite records a pixel, a tiny dot representing the light that hit that spot. A CCD is simply an array of light-sensitive diodes called photosites, which generate an electrical signal in response to light photons. The heart of an optical scanner is a charge coupled device (CCD), the same light sensor system used in digital cameras and camcorders. In the next few sections, we'll find out how scanners do this. A fingerprint scanner's job is to take the place of a human analyst by collecting a print sample and comparing it to other samples on record. This is the basic idea of fingerprint analysis, in both crime investigation and security.
#HOW TO FAKE HARDWARE FINGERPRINT SOFTWARE#
And while two prints may look basically the same at a glance, a trained investigator or an advanced piece of software can pick out clear, defined differences. Just like the weather conditions that form clouds or the coastline of a beach, the entire development process is so chaotic that, in the entire course of human history, there is virtually no chance of the same exact pattern forming twice.Ĭonsequently, fingerprints are a unique marker for a person, even an identical twin. So, in addition to the countless things that go into deciding your genetic make-up in the first place, there are innumerable environmental factors influencing the formation of the fingers. The exact position of the fetus in the womb at a particular moment and the exact composition and density of surrounding amniotic fluid decides how every individual ridge will form.
#HOW TO FAKE HARDWARE FINGERPRINT SKIN#
The genetic code in DNA gives general orders on the way skin should form in a developing fetus, but the specific way it forms is a result of random events. Like everything in the human body, these ridges form through a combination of genetic and environmental factors. The other function of fingerprints is a total coincidence.
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