Classification of two-dimensional codes

Classification of Two-dimensional Codes Two-dimensional bar codes/two-dimensional codes can be classified into stacked/row-row 2D bar codes and matrix-type 2D bar codes. Stacked/row-row 2D barcodes are formed by stacking one-dimensional barcodes with multiple short-cut lines; matrix-based two-dimensional barcodes are formed in the form of a matrix, and "dot" is used to represent binary "1" in the corresponding element position of the matrix. "," use "null" to represent the binary "0", the code consisting of "point" and "empty".

Stacked stacked/row-row 2D barcodes (also known as stacked 2D barcodes or layered 2D barcodes) whose encoding principle is based on one-dimensional barcodes and stacked in two or more rows as required. . It inherits some features of one-dimensional bar code in terms of coding design, verification principle, and reading methods. The reading equipment and bar code printing are compatible with one-dimensional bar code technology. However, due to the increase in the number of lines, the line needs to be determined. The decoding algorithm and software are also not exactly the same as the one-dimensional bar code. Representative rows of two-dimensional barcodes are: Code 16K, Code 49, PDF417 and so on.

Matrix short array 2D barcodes (also known as checkerboard 2D barcodes) are encoded in a rectangular space with different distributions of black and white pixels in the matrix. In the position of the corresponding element of the matrix, a binary "1" is represented by the appearance of points (squares, circles, or other shapes), and the absence of a point represents a binary "0". The arrangement of the points determines the matrix 2D barcode. The meaning of the representative. The matrix type 2D barcode is a new type of graphic symbol automatic reading processing code system based on computer image processing technology, combined coding principle and the like. Representative matrix 2D barcodes include: Code One, Maxi Code, QR Code, Data Matrix, etc.

In the current dozens of two-dimensional codes, commonly used code systems include: PDF417 two-dimensional barcode, Datamatrix two-dimensional barcode, Maxicode two-dimensional barcode, QR Code, Code 49, Code 16K, Code one and so on, in addition to these common two In addition to the bar code, there are Vericode bar code, CP bar code, Codablock F bar code, field code, Ultracode bar code, Aztec bar code. To detect the bar code quality, you need to use a bar code detector. Because the market capacity is not large, this type of detector is rare. Only datalgic, HHP, LIVS, webscan several manufacturers are doing. The webscan trucheck system is the most cost-effective for dataMatrix detection. But webscan has not yet set up an office in China. Only one company (Xinyi Technology) is acting as sales agent.