Comparison of one-dimensional bar code and two-dimensional bar code
Comparison of one-dimensional bar code and two-dimensional bar code
one-dimensional bar code only express information in one direction (normally horizontal), and it doesn’t express any information in vertical direction, usually a certain height is to facilitate the reader's alignment.one-dimensional bar code’s application can improve the speed of information input, reduce the error rate, but there’s some shortcomings: low data capacity, about 30 characters; only includes letters and numbers; Relatively large bar code size (low space utilization); Bar code cannot read after damage.
2-dimensional barcode is barcode stored in two-dimensional space of the horizontal and vertical direction. As one-dimensional bar codes, two-dimensional bar code also has many different coding methods, or the code system. In terms of coding principle of the code system, generally can be divided into three types:
1. The linear stacking qr code, Is on the basis of the one-dimensional bar code coding principle, will be more than one dimension code in the vertical stack. Typical Code system, such as: Code 16 k, 49, PDF417 Code, etc.
2. The matrix qr code, Is in a rectangular space by black and white pixels in different distribution in the matrix coding. Typical Code system, such as: Aztec, Maxi Code, QR Code, Data Matrix, etc.
3. The postal code Through the different length of bar coding, coding is mainly used for mail, like: Postnet、BPO 4-State. Among the 2 d barcodes, commonly used Code systems are: Data Matrix, Maxi Code, Aztec, QR Code, Vericode, PDF417, Ultracode, 49, Code Code 16 k, etc
