According to the classification standards of application areas and specific characteristics, automatic identification technologies can be divided into the following seven types.
1. Barcode recognition technology
One-dimensional barcodes are binary codes consisting of different lines and spacing of widths and widths arranged in parallel.Like what:.These lines and intervals are arranged according to a predetermined pattern and represent the data items of the corresponding notation system.The arrangement of lines and intervals of different widths and narrows can be interpreted as numbers or letters.One-dimensional barcodes can be read by optical scanning, i.e. different reflections of the laser based on black lines and white intervals.
Two-dimensional barcode technology is produced under the premise that one-dimensional barcodes cannot meet the needs of practical applications.Like what:.Due to the limitation of information capacity, 1D barcodes usually mark items rather than descriptions of items.2D barcodes can express information simultaneously in both horizontal and vertical directions, so they can express a large amount of information in a small area.
2. Biometric technology
Refers to the automatic identification of human identity through the acquisition and analysis of the physical and behavioral characteristics of the human body.
3. Image recognition technology
The key information of image recognition technology must have both the information that enters the senses at that time (that is, the input computer system) and the information stored in the system.The re-recognition of the image can only be achieved through the process of comparing the stored information with the current information.
4. Magnetic card identification technology
Magnetic card is a kind of magnetic recording medium card, made of high-strength, high-temperature plastic or paper-coated plastic, moisture-proof, wear-resistant and has a certain degree of flexibility, easy to carry, more stable and reliable to use.The magnetic stripe records information by changing the magnetic polarity, which has the opposite polarity in the place of magnetic oxidation, and the recognizer can distinguish this magnetic change within the magnetic stripe, a process called magnetochange.A decoder can read the magnetic changes and convert them back to the form of letters or numbers in order to be used
5. IC card identification technology
The IC card, that is, the integrated circuit card, is another information carrier that appears after the magnetic card.The IC card stores information through the integrated circuit in the card, and uses RF technology to communicate with the card reader that supports the IC card.RF reader to the IC card to send a set of fixed frequency electromagnetic waves, the card has an LC series resonant circuit, the frequency and the frequency emitted by the reader is the same, so that under the electromagnetic wave excitation, the LC resonant circuit generates resonance, so that there is a charge in the capacitor;At the other end of this capacitor, a single-pass electronic pump is connected to store the charge in the capacitor to another capacitor, and when the accumulated charge reaches 2 V, this capacitor can be used as a power supply to provide operating voltage for other circuits, transmitting the data in the card or receiving data from the reader.
6. Optical Character Recognition Technology (OCR)
OCR (Optical Character Recognition) is a technology that belongs to graphic recognition.The goal is to let the computer know exactly what it saw, especially the written material.
7. Radio frequency identification technology (RFID)
Radio frequency identification technology is an automatic identification technology for data transmission through radio waves, which is a non-contact automatic identification technology.It automatically identifies the target object and obtains relevant data through the RF signal, and the identification work can work in a variety of harsh environments without manual intervention.Compared with bar code recognition, magnetic card recognition technology and IC card recognition technology, it has the advantages of unique contactlessness, strong anti-interference ability, and can identify multiple items at the same time.
