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来自维基百科,自由的百科全书
国际商品编码(英语:International Article Number),即欧洲商品编码(European Article Number,EAN),原来只是欧洲范围内商品代码,而现在已是全球范围内产品交易的商品代码。为了适应读码器辨认的需要,这些代码又做成大家熟知的条形码。
另外,日本于1978年在EAN的基础上开发出日本商品条码(Japanese Article Number,JAN)。
国家代码和生产商代码由EAN各国总部具体发放和管理
这5位代码由厂商自行设定
8位的EAN是专门为小商品设置的代码,所以其组成部分和13位EAN是不同的。
国家代码和生产商代码由EAN各国总部具体发放和管理
这2位代码由厂商自行设定
国家代码只能代表包装该项商品的厂商所在国家(地区),并无法表示出原始生产地。未在下表出现的数字,乃是针对未来使用而保留。
美国依据1970年IBM乔治·劳雷尔所开发12位数字的通用产品代码(Universal Product Code,缩写“UPC”),在1973年制定为标准,后来重新改划为“UPC-A”[2][3][4]。一年之后,为了和美国能协调一致欧洲也指定了一套类似的货品代码体系。1977年建立了欧洲货品协会European Article Association,其组织成员覆盖了全球98个国家。为了综合美国和欧洲的产品代码,设在美国的“均匀码理事会”(Uniform Code Council, UCC)把现今使用的EAN称为EAN·UCC。
1981年,EAN已发展为国际性组织,改名为国际商品编码协会。
2005年EAN正式更名为GS1(Global Standard One)。 2005年1月1日起北美洲实行EAN-13的货品代码。
一位数字由两条明线和两条暗线来定义。
四条线段以最细的一条为标准,分别有一倍、两倍、三倍、四倍四种粗细。
同时一位数字的四条线段加起来的粗度正好是标准线段(最细线段)的七倍。
First digit | First group of 6 digits | Last group of 6 digits |
---|---|---|
0 | LLLLLL | RRRRRR |
1 | LLGLGG | RRRRRR |
2 | LLGGLG | RRRRRR |
3 | LLGGGL | RRRRRR |
4 | LGLLGG | RRRRRR |
5 | LGGLLG | RRRRRR |
6 | LGGGLL | RRRRRR |
7 | LGLGLG | RRRRRR |
8 | LGLGGL | RRRRRR |
9 | LGGLGL | RRRRRR |
First group of 4 digits | Last group of 4 digits |
---|---|
LLLL | RRRR |
Digit | L-code | G-code | R-code |
---|---|---|---|
0 | 0001101 | 0100111 | 1110010 |
1 | 0011001 | 0110011 | 1100110 |
2 | 0010011 | 0011011 | 1101100 |
3 | 0111101 | 0100001 | 1000010 |
4 | 0100011 | 0011101 | 1011100 |
5 | 0110001 | 0111001 | 1001110 |
6 | 0101111 | 0000101 | 1010000 |
7 | 0111011 | 0010001 | 1000100 |
8 | 0110111 | 0001001 | 1001000 |
9 | 0001011 | 0010111 | 1110100 |
要编码一个13位数字,需要先把这些数字分为3部分:第一个数字,开始6个数字和后6个数字。开始的6个数字有两种编码模式,even模式(标识为G)和odd模式(标识为L)。第一个数字不会直接用G或L模式编码,但决定了开始6数字是用G模式还是L模式。后6个数字都会用RRRRRR模式来编码。 To encode the 13-digit EAN-13 number, the digits are split into 3 groups; the first digit, the first group of 6 and the last group of 6. The first group of 6 is encoded using a pattern whereby each digit has two possible encodings, one of which has even parity (denoted with letter G) and one of which has odd parity (denoted with letter L). The first digit is not represented directly by a pattern of bars and spaces, but is encoded indirectly, by selecting a pattern of choices between these two encodings for the first group of 6 digits, according to the table below. All digits in the last group of 6 digits are encoded using a single pattern RRRRRR, the one also used for UPC.
比如第一个数字为0,那么前6个数字全部使用LLLLLL模式来编码。UPC条码可以理解为一个0开头的EAN13条码。 If the first digit is zero, all digits in the first group of 6 are encoded using the pattern LLLLLL used for UPC, therefore, a UPC barcode is also an EAN-13 barcode with the first digit set to zero.
This encoding guarantees that the first group always starts with an L-code, which has odd parity, and that the second group always starts with an R-code, which has even parity. Thus, it does not matter whether the barcode is scanned from the left or from the right, as the scanning software can use this parity to identify the start and end of the code.
EAN-8 barcodes encode all digits directly, using this scheme:
Note: Entries in the R-column are bitwise complements (logical operator: negation) of the respective entries in the L-column. Entries in the G-column are the entries in the R-column in reverse bit order. See pictures of all codes against a colored background.
A run of one or more black areas is known as a "bar", and a run of one or more white areas is known as a "space". As can be seen in the table, each digit's encoding comprises two bars and two spaces, and the maximum width of a bar or space is four areas.
所以,范例的校验码是 9,完整的国际商品条码为 490-8569-21968-9。
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