Most smart phones are now launching in the market with fingerprint scanners. There are also fingerprint sensors in the special features of smart phones that have seen a lot of demand from users. You use the fingerprint sensor in the smart phone to unlock your phone. Fingerprint sensor keeps your phone secure so that your phone can not unlock anything else. In addition to this, fingerprint is used not only in the phone but also in your laptop and in your documents as well as your fingerprint. But do you know how the fingerprint sensor of your phone works? So let’s know .
In simple words, we can tell it as a system that scans the surface of your finger, which changes them into a code that can be used to verify against the database. If you follow carefully, you will know that different types of fingerprint scanners are used in a security system. Let’s see what they are?
The optical scanner puts a bright color over your fingerprint which captures the digital photo of your fingerprint. After this digital photo is feared in the computer for further verification. This light-sensitive microchip like CCD, charger-coupled device, or CMOS image sensor is used to make digital photos. This image automatically converts your fingerprint into code.
Capacitive scanner works by measuring your finger electrically. Because there is a distance between each of your fingers, the capacitive scanner calculates these distances and creates an image of your fingerprint. Such scanners are identical to the touch screen given in the iPhone and iPad. We will tell you how this process is completed, when you put your finger in the scanner. So let’s know .
First of all, in a scanner device where you keep a finger, a bright light burns. This light reflects on the CCD or CMOS image sensor by touching your finger through glass. If image capture process takes more time then the image will be bright on the image sensor. An algorithm is used for this test. It tells you that the captured image is too light or deep. After which the sound of a beep comes, which alerts you and then again brings you back to the process.
This device alerts you even when the captured image does not have an alternative light and sufficient light. After these tests, the scanner tells you whether the image is correct or using the other LED indicator through the beeping. Now the captured image is saved in flash memory. Which is then transmitted to a computer for the next step. Now it will be the computer’s work that the image has to be stored in the database or in the database it is already compared with the Save fingerprint. Usually the size of the image is 512 × 512 pixels. Where as the standard image is 2.5cm (1 inch) square.