Line of sight

Line of sight refers to the direct optical contact between a reader and a marking. This requirement is generally necessary for a barcode or a QR code, because the code must be visible and unobstructed in front of the scanner. In the RFID environment, this is usually not required, because an RFID tag is read by radio. The term therefore describes a central condition of optical identification and at the same time a key difference from radio-based methods. If direct visual contact is missing, an optical code cannot be captured reliably.

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