In fact, the depth of field in imagers is a multivariable function depending on lighting, lens system, code size, and imager speed. A low-end CCD imager includes a linear CCD array of about 500 to 600 pixels by 1 pixel. Such scanners are basically contact reading devices. Such image processing often uses a processor powerful enough to drive a low-end Macintosh computer. Compared with CCD imagers, CMOS imagers are faster, consume less power, more expensive by a few hundred dollars, and still evolving.
Vision systems can also read bar code symbologies.
Plus, they have all the same lens and lighting problems that imagers have. However, their prices have been dropping, making them more competitive for fixed-mount applications. A global shipping label Now for the big news. GM also realized it had to develop a shipping label system that could work with and without technology. Even Graham admits that.