⒈ width adjustment method.

the 2 coding methods of the bar code card!

Width adjustment coding method refers to the bar code symbol consists of width bar unit, empty unit and character symbol interval, width bar unit and empty unit logical representation 1", narrow bar unit and empty unit logical is 0", wide bar empty unit and narrow bar empty unit can be called four coding elements. code-11 code, code-B code code-39 code, 2/5code all use width-adjustment coding method.

Chroma adjustment method

　　the chromaticity adjustment coding method means that the barcode symbol is identified by the contrast between the bar and the empty, with the bar logically indicating 1" and the empty logically indicating 0". We call the 1" and 0" bar empty basic element width or basic element coding width, continuous 1", 0" can have 2 times wide, 3 times wide, 4 times wide, etc.. therefore, this encoding method can be called multiple encoding elements, such as ENA\UPC code using eight encoding elements.