They were specially designed to make scanning frustration-free. The bar codes are linear or two-dimensional optical data. During the scanning bar code scanners examine the code and decipher the signal, while at the same time convert this information into ASCII text and pass on any kind of computer, which communicates with the scanner. The light, which is reflected by the white spaces in the code and includes a voltage peak (white spaces) and lows (black areas) is very important. Although work on the same principle of Imaging scanner, cell phone cameras and digital cameras and capture all a featured picture of the bar code for decoding purposes however, the underlying technology is another: color when compared to black and white, depth of field, lighting as well as special applications and ergonomics factors represent. Barcodes for business applications are designed for special bar code imager and black and white. The camera in the phone, however, is a color imager for high resolution images.
This means that the relatively small size of the pixels in the images, resultant is less sensitive than a traditional barcode imager. The depth of field is defined as the distance between the maximum and minimum level, in which a reader is able to read a bar code. These special scanners typically have a very long depth range. Thus, you can focus imager, scanning, without the codes within a certain bandwidth over certain distances. Different cell phone cameras: there are a number of limitations in achieving the from depths range depending on the fixating or auto-focusing technology. Auto focusing camera, for example, allow the user to absorb more light, can at the same time focusing only on a relatively small area. Auto focusing cameras in mobile phones need time to focus on the correct range and provide a relatively small depth range. This causes problems when bar codes are scanned at an angle.