The one-dimensional code and the two-dimensional code are interconnected and exist in the current bar code industry. The two-dimensional code is equivalent to the development level based on the one-dimensional code, and naturally it is better than the one-dimensional code in some aspects such as density, error correction capability, rewritable, and representable content, but At the same time, it also has relative shortcomings and differences. The replacement of one-dimensional codes by QR codes will eventually become an inconclusive clear trend and is accelerating.
There are now more than 225 one-dimensional bar codes in the world, each with its own set of specific coding specifications, which stipulates that each letter (possibly a number or a text or a number) is made up of several lines (Bar) and a few Space composition, and the arrangement of letters. Generally, the more popular one-dimensional barcodes are 39 yards, EAN code, UPC code, 128 code, and ISBN, ISSN, etc., which are specially used for book management. The one-dimensional code is determined by the different spacing of the parallel lines of black and white to identify the black and white, rectangular stripes with different thicknesses. The stripes usually have numbers or English characters. It can quickly know the basic information of the identified object such as the name of the product, the price, etc. but can not describe the product. Just like it knows that this is the code name of a part in the warehouse, but it is not certain whether it identifies "A" or "B", and does not know the difference between them. This is the biggest drawback of one-dimensional code.
The two-dimensional code is a black and white image with different thicknesses and different dots, which are different in size and size. Not only can it identify and easily describe the information of the recognition object, the two-dimensional code contains more information capacity than the one-dimensional barcode, in addition to the basic information such as name, unit, address, telephone, etc. Store the characteristics of the human body such as fingerprints, retinal scans and photos in the barcode. Are there any information such as the gynaecology that are quickly displayed in the computer and reduce the crime rate, instead of waiting for the database to confirm these? information. Therefore, the QR code has been widely used abroad. It was applied to the identification of documents in the early period.
Bar code technology is mainly used in transportation, warehousing, retail, logistics, department, manufacturing, medical and health. One-dimensional bar code is still the dominant application in today's applications, especially in the mass consumer field, accounting for about 80% of the bar code collector market. At the same time, it has a price advantage, and the development time has formed a certain scale and standard.
However, the gradual replacement of the two-dimensional code by the one-dimensional code will eventually be a general trend. Experts believe that "the market that the one-dimensional code has now will be the market of the two-dimensional code. Now, due to the wide and huge size of the one-dimensional code application field, it is replaced. Equipment needs huge sums of money, so it is necessary to gradually replace the value of the one-dimensional code with the QR code.
QR code is gradually being applied in areas where there is a large demand for data. For example, the QR code and the hottest WeChat scan have been identified on the internal, battery and charger of all new Nokia phones. Wait.
Compared with RFID technology, the biggest advantage of two-dimensional code technology is that the two-dimensional code only has low bar code printing cost. The cost of the main RFID chip cannot be reduced to 1 cent, and it is impossible to replace the bar code technology. Therefore, they are used separately. Different fields. The two-dimensional code is relatively low in cost compared to the one-dimensional code, but the price of the scanning device is relatively high. At present, some companies use a foreign two-dimensional code system, and they all need to pay a high license fee. In contrast, the domestic independent research and development and the international advanced level of the two-dimensional code system --- Long Bei code, there is no such problem.
The two-dimensional code will be applied to more fields, and nowadays foreign developed countries are widely used in banking, logistics, defense, customs, taxation, public safety, transportation, and civilian goods.
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