One-dimensional code can only express information in horizontal direction; Two-dimensional code can express information in both horizontal and vertical directions.
Barcode is to arrange several black bars and blanks with different widths according to certain coding rules to express different information. At present, there are two kinds of bar codes: one-dimensional code and two-dimensional code.
One-dimensional coding can improve the speed of information input, but it can only express information horizontally, and the data capacity is small. Except for some visible characters, most coding systems can only contain numbers and letters, and the bar code size is relatively large (low space utilization), so it can't be recognized once it is destroyed.
Two-dimensional code can express information in both horizontal and vertical directions, with large data capacity, and the information content can include Chinese characters, characters, letters, numbers and so on. , the scanning device can read directly without connecting to another database. Bar codes are relatively small in size (high in space utilization) and have anti-destruction ability.