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Technically explain the difference between one-dimensional and two-dimensional scanning guns

Release Time:2020-07-10

With the increasing development of social economy and the progress of the information age, one-dimensional bar code can no longer meet people's needs, so two-dimensional bar code appeared. Technically explain the difference between one-dimensional and two-dimensional scanning guns: two-dimensional codes are identified by identifying images, and lasers cannot even identify two-dimensional codes on paper! If it is a one-dimensional code, the recognition principle of the laser is to emit a light source and then reflect it. The screen itself is the light source, so it cannot be recognized. Scanning guns that can identify the screen on the market are also identified by linear CCD.

　　

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The difference between the appearance of one-dimensional and two-dimensional scanning guns

The two-dimensional code is usually a square structure, which is not only composed of horizontal and vertical bar codes, but also has polygonal patterns in the code area. Similarly, the texture of the two-dimensional code is black and white with different thicknesses and in the form of dot matrix.

One-dimensional bar code is composed of vertical black and white bars, black and white, and the thickness of the stripes is also different, usually there will be English letters or Arabic numerals under the stripes.