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    Scanner Scanner Presentation Transcript

      • Ngô Thùy Trang
      • Nguyễn Ngọc Tiến
      • Trần Thị Thùy Hương
      • Lê Việt Tiên
      • Phạm Thị Như Quỳnh
      Scanner
    • What is scanner?
      • An input device that scans (reads) the image as a series of dots and introduces the information into the computer’s memory.
      • (Infotech Glossary)
    • Some definition
      • DPI
      • Electronic code
      • Digitized image
    • DPI
      • DPI (dots per inch): density of computer or printer image: a measure of the density of the image produced by a computer screen or printer. (Prodic Dictionary)
    • Electronic code
      • A scanner ‘see’ images and converts the printed text or pictures into electronic codes that can be understood by the computer.
      Electronic code
    • Digitized image
      • A representation of a two-dimensional image using ones and zeros (binary).
    • What is inside a scanner?
      • Colored filter
      • Rotating lamps
      • Software for scanner
      • OCR software
    • Rotating lamps
      • The scanner operates by using 3 rotating lamps which has a different colored filter
    • Colored filter
      • It has 3 different colors: red, green and blue
    • Software for scanner
      • Software for scanner translates the API procedure calls into primitive commands
      • Some common scanner software:
      • SANE (Scanner Access Now Easy)
      • TWAIN
      • ISIS (Image and Scanner Interface Specification)
      • WIA (Windows Image Acquisition)
      • (Wikipedia)
    • OCR software
      • OCR (Optical Character Recognition)
      • OCR software let you easily convert images, such as digital photographs, scanned documents, printed books, etc. into text.
    • Flatbed scanner
      • A scanner with a glass scanning surface on which objects are placed; similar to a photocopier. (Infotech Glossary)
    • How a flatbed scanner works?
      • 1: a flatbed scanner ‘see’ images and converts them into electronic codes.
      • 2: The scanning unit moves across the image to be scanned
      How a flatbed scanner works?
    • Process of scanning a glass pane (platen) a bright light Charge-Coupled Devices
    • How a flatbed scanner works?
      • 3: It reads the image as a series of dots and then generates the digitized image.
      • 4: Digitized image is sent to computer and stored as a file.
      How a flatbed scanner works?
        • You place a drawing, photograph or other printed document face down on the glass and close or lower the plastic cover. When you activate the scan feature, a light shines from under the plastic and a copy of your paper appears on your monitor.
      Uses of Flatbed scanner
    • Thank you for your attention!