7.3.3 Describe Flatbed scanners
Flatbed scanners are often used to scan books and photographs for archiving. An electronic image is acquired by placing the book or photograph face down on the glass. The scanner head, consisting of an array of image sensors, lies beneath the glass and moves along the item, capturing the image. Sheet feeders can be used with flatbed scanners to scan multiple images. A sheet feeder is a device that can be attached to some flatbed scanners to hold multiple sheets and feed them into the scanner, one at a time. This feature allows for faster scanning; however, the image quality is usually not as good as a flatbed scanner that does not use a sheet feeder.