Document imaging
Document scanners are used for rapid collection of large quantities of documents in the shortest possible time. They are used in a paperless office, banks and insurance companies as well as libraries to store documents as possible to save space and efficiently. The acquisition process is called scanning.
Properties
The scanners are usually run as debit or swipe scanner and can work off automatically depending on the execution stack of documents from 50 to 1000 pages. Most models are able to detect by means of two CCD sensors strips, the front and the back at the same time in a single scan ( duplex). Some models are designed as a combination of transit and flatbed scanner to scan bound documents without even destruction can. The scan quality is dependent on the selected or available resolution. The optical resolution of document scanners is usually at 200-400 ppi, meanwhile 600-1400 ppi are possible.
Typical interfaces for data transmission to the connected computer system are Ethernet, SCSI, Firewire or USB 2.0. Previously, there was also a separate video interface system, since the scanner provided an even for a SCSI system to large data stream. Due to the continued acceleration of the other interfaces, the video system is now part of the past.
The speed of the scanner is dependent on the design and the intended application. For scanners for the workplace, the typical values are at 25 DIN-A4-Seiten/Minute. In centralized high-performance systems up to 500 DIN-A4-Seiten/Minute can be recorded on both sides. Often in such devices not only a scan will be delivered, but the document photographed simultaneously on microfilm and extracted the data using text recognition software (OCR ) for further processing.
Application environment
It is used often in close interaction with a software solution for electronic archiving, enterprise content management systems or document management. Frequently come along with the document scanner specific software applications such as quality control, image enhancement, OCR and other document technologies used.
For the acquisition of business documents primarily pure black -and-white devices ( with green as blind color), used or scanner that can distinguish more shades of gray, increasingly come in this respect also the already established for the acquisition of color images color scanner for use.