認識條碼格式
條碼種類
條碼技術廣泛地應用於商業、工業、文書處理、倉儲、交通等範疇，其精確度高、低成本、速度快的優點，能大大提高生產效益，而不同設計的條碼所應用的範圍也大不相同。
條碼的種類可分為一維條碼、二維條碼及三維條碼。一般來說，以一維條碼較為普及，但所儲存的資料則相對地較少。下表簡單地介紹數種較為普遍的一維條碼以作參考。
| Category | Sample | Description | Features |
| UPC-A |
 |
The UPC-A Code and the assignment of manufacturer ID numbers are controlled in the U.S.A. by the Uniform Code Council. It is mainly used in the retail products in the USA and Canada. |
-Support digits 0-9 -12 characters length |
| UPC-E |
 |
It is the simplified version of UPC-A code |
-Support digits 0-9 -8 characters length |
| EAN-13 |
 |
EAN-13 is commonly used for commodities in worldwide. IANA controls and assigns the authorities of each member countries. Those barcodes must be allotted and approved by these Authorities. The Authority of Hong Kong is HKANA. |
-Support digits 0-9 -13 characters length |
| EAN-8 |
 |
It is the shortened version of the EAN-13 code. |
-includes digits 0-9 -8 characters length |
| C39 |
 |
Code 39 is able to consist of alphabets and numbers. It is therefore widely used in many industries even in libraries and hospitals. | -includes the digits 0-9, the letters A-Z and the following symbols: 、+ - * / % $ |
| C128 |
 |
C128 can be varied by length. It is much complicated than the above barcodes since it can support longer characters. It has therefore higher flexibility in usages. |
-includes all -numeric and alphanumeric data |