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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 following QR barcode is attached to a computer or smartphone to prove it belongs to a specific person. It uses a b type field, described above, to contain a secure personal identification number [PIN] remembered by the owner of the device. The DigSig Verifier will ask for the PIN to be entered, before the verification can take place.
A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner , it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.