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A barcode scanner is a device designed to read barcodes printed on a retailer's products for the objective of stock control and to recover the newest pricing. They are also recognized as barcode readers and they are electronic devices that have a light supply and a light sensor, used for translating the optical image of the printed barcode into an electrical image. The electrical information can be linked to an electronic till or some form of computerised system designed to read the information.

Handheld barcode scanners are probably the most well-liked simply because of the flexibility of movement and the mobility they offer. A handheld barcode scanner can be used by an operator to locate the barcode and run the scanner over the barcode.

Desktop barcode scanners are also extremely well-liked and can be found in might retail outlets such as division stores and supermarkets exactly where the item containing the barcode is located more than the scanner in order to acquire the image. They can frequently be co-situated with handheld scanners so operators can locate barcodes placed on awkward areas of a product.

A number of different methods are used to obtain the image of the barcode:

One simple method used by pen-kind scanners is to run the scanner across the barcode in steady motion a photodiode measures the spacing in between the dark bars and the light portion to produce an image. Laser scanners work in the exact same way except that they use a laser as the source of light.

Some scanners use a camera to capture a 2-dimensional image of the code and then process the image to create the barcode.

Sometimes, a problem with barcode readers is the inhability to read a barcode that is not completely orientated on a flat surface, or it isn't feasible to manoeuvre the item holding the barcode into a appropriate position. Some readers, such as these used in supermarkets use laser technology, but in such as way as to send out a serious of light beams in various directions to a pre-determined pattern, which enables the device to detect even awkward images that may not be on an even surface.

Barcode readers can have a number of interfaces to enable connection to a Computer or storage device. Most likely the most common interface is a USB interface which is accessible on most PCs and terminal devices these days. The barcode reader can also obtain its power from the terminating device, so that an external power supply or batter power is not required. Early barcode readers could use a regular keyboard port on a Computer, with the barcode scanner emulating the keyboard so that characters could be displayed and stored on the Computer. This was frequently referred to as a 'Keyboard Wedge'.

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