Atitit commonly used two-dimensional code comparison (QR, PDF417, DM, Han letter code Aztec Code Maxicode

AtititCommonTwo-dimensional codeCompare(QR,PDF417,Dm, Han Xin code Aztec Code Maxicode

The DM code is more "small", can encode 30 numbers on the area of only 25mm2. But also because it is too small, its information capacity is limited, DM can not express Chinese characters and other forms, and QR code to use data compression method to express Chinese characters, only 13bit can represent a Chinese character, compared with other two-dimensional bar code to express the efficiency of Chinese characters 20%. In comparison, the DM code information capacity is small, the application is simple. QR is more advantageous in the processing of Chinese characters.

Data Matrix

On the ability to correct errors, QR code has four different levels of error correction function, even if the breakage even if bent or up to 30% of the deformity can be read correctly. Shows its powerful error correction capability, but the DM behaves better on the code breakage. It only needs to read 20% of the data to accurately read

look at the reading speed and the reading angle of the competition. the full name of the QR code is quick Response code, the literal translation is: Fast response code, it is seen that ultra-high-speed reading is the most prominent feature of the QR code, is the QR Code code to distinguish between the main characteristics of the other two-dimensional code. According to statistics, using CCD two-dimensional barcode reading equipment, can read 30 100 characters per second QR code symbol, and for the data Martix matrix code, can only read two or three symbols per second. The QR code on the reading angle has a full-range (360°) reading feature. The DM code does not have a QR code-like image, so it can only be read in one Direction.

The function of Dm code

andDMThe biggest feature of the code is"Small", can be in25mm2Area Coding -is widely used to mark small items such as integrated circuits and pharmaceuticals. RelativeQRterms,DMcode becauseInformationSmall Capacity,Simple Application,called by the industry“Simple Code", there are many successful cases in China at present. Galaxy

Common Two-dimensional code comparison (QR,PDF417,DM, Han letter code)

Reference link : http://blog.csdn.net/amosryan/article/details/8139828

		QR (day)	PDF417 (US)	DM (han)	Chinese Code (medium)	remarks
Invention Time		1994	1992	1989	2005
Whether China's national standards		Is	Is	Whether	Is
Whether international standards		Is	Is	Is	Is
Area (MM*MM)	Minimum	21*21	90*9	10*10	There are 84 versions available for your own choice, with a minimum code size of only nails
	Biggest	177*177	853*270	144*144
Amount of information stored		Big	Minimum	Small	Big
	Bytes per square inch	2953 (7% error correction information)	1106 (0.2% error correction information)	1556 (14% error correction information)	4350
	Digital	4296	2710	3116	7829
	Character	7089	1850	235	4350
	Chinese characters	1817			2174
	Binary	2953	1556		3262
Error correction capability	Error correction grading	Level 4	9	Non-discrete grading	Level 4	The more error-correcting ability, the less effective information can be stored
	Maximum error correction information	30%	46.2%	25%	30%
	Minimum error correction information	7%	0.2%	14%	8%
Express Chinese		Excellent	Poor	So so	Excellent
Decoding speed		Fast	Slow	So so	Fast
Anti-distortion, fouling ability		Weaker	So so	Super strong	Strong
Identify directionality		Omni-Directional	Single direction	Single direction	Omni-Directional
Identify the device		Support mobile phone, PAD, webcam	Limited Special Equipment	Support mobile phone, PAD, webcam	Limited Special Equipment	Currently most mobile QR code software only supports

Aztec Code

No static requirements suitable for identification in a limited space; The general code value in the handheld terminal, such as mobile phone, because the edge of the screen is reflective of the reader is often unable to identify the static area of the bar code is not able to read the barcode information, Aztec code The advantages of non-static zone requirements can be well reflected , a variety of error correction level 5%-95%, users can choose according to the needs.
The structure of the Aztec code is made up of 3 fixed structures and 2 change structures, and the compact, small size Aztec code does not have a coordinate grid, providing a coordinate reference for the precise distribution of the data in larger code values; The location image is the bull-eye image in the picture; The module information includes the data layer of the whole bar code, The number of data bits, and the relevant checksum information; see

References

Common two-dimensional code introduction --aztec code-The basic knowledge-online two-dimensional code making _ love QR code. html

Two-dimensional code Java Development (note)-wojiao555555 's Column-Blog channel-CSDN.NET.html

Generate two-dimensional code images in java (DM format)-Download channel-CSDN.NET.html

Common two-dimensional code introduction --aztec code-Nanjing Kim Dong-kang. html

parsing Bartender Barcode Aztec code--Baidu Hundred. html

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Atitit commonly used two-dimensional code comparison (QR, PDF417, DM, Han letter code Aztec Code Maxicode