The scanner. scanner defined:. A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display.
IN THE PAST AND NOW
1-Drum ScannersDrum scanners capture image information using photo multiplier tubes (PMT) technology unlike the charged coupled device (CCD) used in flatbed scanners and film scanners.
2- Flatbed scanner
Another type of scanner is the flatbed scanner. A flatbed scanner is usually made of a glass pane, which is illuminated with a bright light found underneath, and a moving optical CCD or CIS array.
A Hand scanner is a manual device that is dragged across the surface of the image to be scanned. Scanning documents in this manner is difficult as this requires a steady hand, to avoid uneven scanning rate that would produce distorted images.
advantages:1) Scans anything.2) light and portable.3) Old document can be kept in digital form.4) Fast and convenient to have a copy done.disadvantages:1) Only can scan on the surface but not above it.2) Quality of scan not the same as original .
Thank s All