World’s first barcode came into existence on a pack of a chewing gum from Wrigley Company in 1974. Barcodes are now found in virtually every package of item available in stores. A barcode has information which is coded and decoded only by machine named barcode scanners. Businesses use barcodes for different reasons, such as tracking prices, products, and stock levels to perform centralized recording.
2D and linear are two different types of barcodes. The Universal Product Code (UPC) are the most recognizable and linear barcode made of 12-digit UPC number and the barcode itself. The identification number of the manufacturer is the first six digits of barcode. The item number is next five digits and last number is check digit which allows scanner to verify if scanned barcode was correct.
Usually, a linear barcode has any kind of text details. On the other side, 2D barcode is more complex and has more details, such as quantity, price, image and web address. It cannot be scanned by a linear barcode scanner. You need an image scanner to decode the information in 2D barcode.
A lot of barcode scanners have three parts, such as sensor, illumination system, and decoder. Generally, the black and white lines of the barcode are scanned by the barcode by illuminating code using red light which is turned into matching text. The sensor in barcode scanner more specifically detects the light reflected from the red light (the illumination system) and generates analog signal which is sent to the decoder. That signal is interpreted by the decoder which validates barcode with check digit and it is then turned into text.
The scanner delivers this converted text to the software which holds database of the cost, maker, and amount of products which are sold. Barcode scanners have different features according to industry specifications, such as work volume capacity and reading range.