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ZXing – Multiplatform open source barcode scanner / generator with versions available in Java (core project) and ports to ActionScript, C++, C#, ObjectiveC and Ruby. Python Bar Code 128 – This code appears to draw boxes one pixel wide. It appears it was modified from a short line long line bar code which would have drawn lines.
Symbol Technologies, Inc., was an American manufacturer and supplier of mobile data capture and delivery equipment. The company specialized in barcode scanners , mobile computers , RFID systems and Wireless LAN infrastructure.
MicroPDF417 barcode allows to add metadata [3]: AnnexH to the barcode symbol which can add description of current barcode symbol. However, because MicroPDF417 has restricted amount of capacity it is used rarely. Some structured append fields cannot be omitted and set in case structured append is added to the symbol, some fields are optional.
These barcodes only represent the digits 0–9, unlike some other barcode symbologies which can represent additional characters. The most commonly used EAN standard is the thirteen-digit EAN-13 , a superset of the original 12-digit Universal Product Code (UPC-A) standard developed in 1970 by George J. Laurer . [ 1 ]
PDF417 is a stacked barcode that can be read with a simple linear scan being swept over the symbol. [4] Those linear scans need the left and right columns with the start and stop code words. Additionally, the scan needs to know what row it is scanning, so each row of the symbol must also encode its row number.
The Patch Code is usually close to feed edge of the scanner. That way, the Patch Code can be detected early during the paper transport. Patch Codes are often printed along all four edges of a page. That covers the requirements for many scanners, and it allows the pages to work even if the page is upside down (rotated 180 degrees).