The purpose of this report is to survey the current state of scanner technology and to briefly discuss predicted advancements in the field.
By examining a range of recently published journal articles, magazine articles and internet sites on the topic of scanners this report describes the main types of scanners in common use today and examines their performance in relation to four criteria: resolution, bit-depth, dynamic range and software. The report then considers the effect of further technological advances in these four areas, as well as the deployment of new sensor technology on the future development of scanners.
The first scanner, initially referred to as a 'reading machine', was developed in 1960 by Jacob Rabinow, a Russian born engineer. The device could scan printed material and then compare each character to a set of standards in a matrix using, for the first time, the "best match principle" to determine the original message (Blatner, Fleishman and Roth 1998, p.3). This reading machine was to form the basis for the development of current scanning, sorting and processing machines.
An early improvement on the reading machine was the drum scanner. These scanners used a type of scanning technology called photomultiplier tubes (PMT). Drum scanners are still used in industry today because of the high quality images they produce. The development of smaller, more economical scanners such as desktop scanners and scanners for domestic use followed the drum scanner as the number of computer users increased and computer technology advanced.
Scanners can now capture images from a wide variety of two and three dimensional sources. These images are converted to digitised computer files that can be stored on a hard-drive or floppy disk. With the aid of specific software, these images can then be manipulated and enhanced by the user. It is now possible to deploy electronic acquisition to create an entire layout (including all graphic elements) from the same computer. This means manual stripping is no longer required (Scanners, digital cameras and photo CDs 2000). Scanners are considered an invaluable tool for adding graphics and text to documents and have been readily adopted by both business and domestic users.