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Your question is a little nonsensical. let me explain.
The information that makes up a barcode is visual information, therefore any process to capture information from that barcode must be retrieved optically.
Secondly a digital computer requires that any information it receives to process, must be digitally encoded. Therefore any input is by default must have been digitised. barcode images, key presses, sound, all must be converted to numbers before they can be processed.
There are two methods which are used to retrieve barcode data. The first is the type you see at the supermarket. This uses a laser to scan the barcode. the reflection of the laser light off the barcode produces a binary code which is sent to the CPU for processing.
The other method of reading a barcode uses a camera (Digitiser) to take a picture of the barcode this picture is stored in the memory of the computer then image processing algorithms are used to distinguish the white and black bars and the code is read.
So to answer your question both options are true Barcodes are read optically and digitised.
What else can I help you with?
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errorcode 1453
