Human Fingerprint means Alternating grooves with gaps and non-systemic intersections. From the perspective of graphics, these are black and white stripes. From a digital fingerprint lock point of view, these are approximate or distant areas of the skin of a linear shape.
Everyone knows how a computer scanner works. He actually photographs the image, converting the picture into digital format. Using a simple computer program, you can decompose a fingerprint into pixels, and create a real digital image passport. Moreover, this information will be unique: that is, capable of identifying only one person the owner of this very finger.
As a result, we have the following algorithm of work:
When adjusting the locking device, users apply one or more fingers to the optical scanner. The fingerprint is scanned, its electronic “passport” is stored in the device’s memory.
In the lock opening mode, the scanner is always in a ready state, or it is activated when certain actions are performed touch the body, pull the handle, press a button, etc. The user presses the pad of his finger against the scanner window, the “picture” is read, the electronic “brain” checks against the images in the database.
If the fingerprint matches the database, the electronics gives a command to the actuator. The lock is unlocked, the front door (safe door) is open.
There are additional algorithms that can be included:
- Blocking the lock with a certain number of unsuccessful attempts to “select a finger”;
- The need to scan multiple fingers for one user;
- A combination of a digital code and a fingerprint.
Any additions at the same time increase the cost of the structure and increase its security.