Position: Home > SYSCAN 2D Barcode> Advantage of CM,GM code
1、Comparison between 2D barcode and 1D barcode
Barcode type Information density Information capacity Information type Error correction function Dependence on database Nature
1D Low Small Numbers, English Yes Must depend on database or communication network Object label & index
2D High Big Numbers, English, Chinese, pictures, voice and other binary information No No depend on database or communication network Description on objects
1D Barcode CM 2D Barcode
1D Barcode CM 2D Barcode
2、Comparison between CM code and PDF417 & QR codes
  If compared with PDF417 and QR codes, CM is obviously more appreciated due to its 32K of capacity. In the fields of biological identification and digital documentation, images, fingerprints and large amount of text need be saved into 2D barcodes, thus storage capacity of 2D barcodes has been a critical factor. Usually compression technologies are required for PDF417 and QR to handle normal image and fingerprint biological identification, which not only makes application more complicated, but also results in distortion after compression.
2D barcode QR PDF417 CM
Max capacity 3 KB 1 KB 32 KB
Error correction level Levels 1~4 Levels 0~8 Levels 1~8
Barcode shape Square only Any rectangle Any rectangle
Chinese encoding efficiency Normal Low High
Savable information Text, symbols and small images Text, symbols and simple images Text, symbols, colorful pictures and even voice
Photoelectrical sensor (core part of a reader) Made in Japan Made in Japan Made in China
Intellectual property rights Japan US China
  To obtain a specific impression on their capacities, we can have a direct comparison on how much area PDF417 and CM codes respectively need to save the same information.
PDF417 and CM 2D codes saving 20 numbers
PDF417 and CM 2D codes saving 200 numbers
PDF417 and CM 2D codes saving 2,000 numbers
Scale: 5.2:1
3、Comparison between GM code and Data Matrix, PDF417 & QR codes
  GM, Data Matrix, PDF417 and QR are all of the general type of 2D barcodes, whose technical specifications are as follows:
2D barcode Data Matrix QR PDF417 GM
Layout Matrix Matrix Layers (1D layout) Matrix
Max capacity 1.5KB 3 KB 1 KB 2 KB
Readable direction Full direction Full direction Upward/downward 360o full direction
Image “dead point” Yes (no tarnishing for positioning image) Yes (no tarnishing for positioning image) Yes (no tarnishing for positioning image) No
Chinese encoding efficiency Bad (16bit) Bad (16bit) Bad (16bit) Good (13bit)
Photoelectrical sensor (core part of a reader) Made in Japan or US Made in Japan Made in Japan or US Made in China
Intellectual property rights US Japan US China
Sample picture
  It has been disclosed from the above table that GM code is of stronger tarnishing and distortion resistance, much competitive in the object distribution application.
4、Comparison between 2D barcode and other automatic identification technologies
Information media Magnetic card OCR identification Biological identification RFID 2D barcode
Identification speed 0.3-2s 4-8s 1-5s 0.3-0.5s 0.3-1s
Bit error rate Up to life of magnetic media 1/ 1,000 1/300 Up to noise and angle 1/1,000,000
Technical advantage Portable and data rewritable Quick in image and symbol operation Non- counterfeitable Quick and batch processing Quick and accurate
Print cost Intermediate Low High Very high Very low (only ink cost)
Sample
 
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