The two-dimensional code, also known as two-dimensional bar code, was first invented in Japan. It uses a certain geometric pattern to record data symbol information in a plane (in a two-dimensional direction) according to a certain law. The concepts of "0" and "1" bit streams that form the internal logic of the computer are used skillfully. Several numerical objects corresponding to binary are used to represent literal numerical information, and are automatically read by an image input device or photoelectric scanning device. In order to achieve automatic processing of information. It has some common features of barcode technology: each code has its own specific character set; each character occupies a certain width; has a certain verification function. At the same time, it also has the features of automatic recognition of different lines of information, and the ability to handle graphic rotation changes.
What kind of changes did our QR code bring to our lives? What are the advantages and disadvantages of this application? Let's talk about the pros and cons that the QR code brings us.
Two-dimensional code five major advantages
The QR code is more complex than the bar code we saw earlier, but it contains more content, so it also shows several advantages:
First, the QR code contains more information. The two-dimensional code uses high-density coding, and small graphics can accommodate 1850 uppercase letters or 2710 digits or 1108 bytes, or more than 500 Chinese characters, which is several dozen times the capacity of ordinary bar code information. Such a large amount of information allows us to convert more styles of content into two-dimensional codes, and to transmit more information through scanning.
Second, there is a wide range of coding. The QR code can encode digitized information such as pictures, sounds, characters, signatures, and fingerprints, and can be represented by a bar code; it can represent multiple languages ​​and characters; it can represent image data.
Third, the two-dimensional code decoding is accurate. We know that the QR code is just a graphic. To obtain the content in the graphic, we need to decode the graphic. The decoding bit error rate for two-dimensional codes is one ten-millionth, while the two-digits coding error rate for ordinary bar codes is much lower.
Fourth, it can introduce encryption measures. Compared with barcodes, two-dimensional codes have better confidentiality. By introducing encryption measures in the two-dimensional code, better protection of decoded content is not obtained by others.
Fifth, low cost and easy production. The QR code has a lot of useful content, but its cost is not high and it can be used for a long time.
There are always two sides of things. We talked about the advantages of the five dimensions of the two-dimensional code. Of course, the two-dimensional code also has its own disadvantages. Here we talk about the disadvantages and deficiencies of the two-dimensional code.
Insufficiency in the United States and the disadvantages of the two-dimensional code
Two-dimensional code is gradually being recognized by everyone, but in fact, two-dimensional code also has its own shortcomings.
First of all, the two-dimensional code has a large amount of information, but this is a double-edged sword. We can obtain more information through the two-dimensional code, and it is also possible that this small two-dimensional code will leak its own personal information. Nowadays, there are already two-dimensional codes on the train ticket that can store personal information. Not long ago, there were news that passengers were illegally used to obtain passenger information because they were discarded at random and used by criminals.
The two-dimensional code has good encryption, so for two-dimensional codes with personal information or important information, we need more perfect encryption measures to ensure the security of information within the two-dimensional code.
Second, the equipment for identifying two-dimensional codes is not rich enough. The two-dimensional code stores a large amount of information. To obtain this content, we must use the relevant decoding device. Current decoding devices include hand-held and stationary scanners, and mobile phones with cameras in our hands.
Hand-held stationary scanners are mostly used by some public agencies and commercial organizations. According to the current understanding of mobile phones with cameras, basic software can only install corresponding software on smart phones to decode and encode two-dimensional codes. Currently, the types of two-dimensional code decoding devices have yet to be improved when smartphones are not yet popular.
Overall, the emergence of two-dimensional codes has brought new changes to our lives. Thanks to the advantages and features of two-dimensional codes, they can be widely used on tickets and coupons. By scanning the code, we can directly access the website for related content viewing and related content download. In addition, in addition to the two-dimensional code can be printed on the paper, we can also put him on the screen of a mobile phone or computer, as long as the scan code device can complete the decoding of the two-dimensional code content. Currently, two-dimensional codes have been used in e-ticketing, coupons, membership systems, etc. It is believed that in the future, there will be greater use of two-dimensional codes.
What kind of changes did our QR code bring to our lives? What are the advantages and disadvantages of this application? Let's talk about the pros and cons that the QR code brings us.
Two-dimensional code five major advantages
The QR code is more complex than the bar code we saw earlier, but it contains more content, so it also shows several advantages:
First, the QR code contains more information. The two-dimensional code uses high-density coding, and small graphics can accommodate 1850 uppercase letters or 2710 digits or 1108 bytes, or more than 500 Chinese characters, which is several dozen times the capacity of ordinary bar code information. Such a large amount of information allows us to convert more styles of content into two-dimensional codes, and to transmit more information through scanning.
Second, there is a wide range of coding. The QR code can encode digitized information such as pictures, sounds, characters, signatures, and fingerprints, and can be represented by a bar code; it can represent multiple languages ​​and characters; it can represent image data.
Third, the two-dimensional code decoding is accurate. We know that the QR code is just a graphic. To obtain the content in the graphic, we need to decode the graphic. The decoding bit error rate for two-dimensional codes is one ten-millionth, while the two-digits coding error rate for ordinary bar codes is much lower.
Fourth, it can introduce encryption measures. Compared with barcodes, two-dimensional codes have better confidentiality. By introducing encryption measures in the two-dimensional code, better protection of decoded content is not obtained by others.
Fifth, low cost and easy production. The QR code has a lot of useful content, but its cost is not high and it can be used for a long time.
There are always two sides of things. We talked about the advantages of the five dimensions of the two-dimensional code. Of course, the two-dimensional code also has its own disadvantages. Here we talk about the disadvantages and deficiencies of the two-dimensional code.
Insufficiency in the United States and the disadvantages of the two-dimensional code
Two-dimensional code is gradually being recognized by everyone, but in fact, two-dimensional code also has its own shortcomings.
First of all, the two-dimensional code has a large amount of information, but this is a double-edged sword. We can obtain more information through the two-dimensional code, and it is also possible that this small two-dimensional code will leak its own personal information. Nowadays, there are already two-dimensional codes on the train ticket that can store personal information. Not long ago, there were news that passengers were illegally used to obtain passenger information because they were discarded at random and used by criminals.
The two-dimensional code has good encryption, so for two-dimensional codes with personal information or important information, we need more perfect encryption measures to ensure the security of information within the two-dimensional code.
Second, the equipment for identifying two-dimensional codes is not rich enough. The two-dimensional code stores a large amount of information. To obtain this content, we must use the relevant decoding device. Current decoding devices include hand-held and stationary scanners, and mobile phones with cameras in our hands.
Hand-held stationary scanners are mostly used by some public agencies and commercial organizations. According to the current understanding of mobile phones with cameras, basic software can only install corresponding software on smart phones to decode and encode two-dimensional codes. Currently, the types of two-dimensional code decoding devices have yet to be improved when smartphones are not yet popular.
Overall, the emergence of two-dimensional codes has brought new changes to our lives. Thanks to the advantages and features of two-dimensional codes, they can be widely used on tickets and coupons. By scanning the code, we can directly access the website for related content viewing and related content download. In addition, in addition to the two-dimensional code can be printed on the paper, we can also put him on the screen of a mobile phone or computer, as long as the scan code device can complete the decoding of the two-dimensional code content. Currently, two-dimensional codes have been used in e-ticketing, coupons, membership systems, etc. It is believed that in the future, there will be greater use of two-dimensional codes.
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