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  1. 1. <ul><li>Ngô Thùy Trang </li></ul><ul><li>Nguyễn Ngọc Tiến </li></ul><ul><li>Trần Thị Thùy Hương </li></ul><ul><li>Lê Việt Tiên </li></ul><ul><li>Phạm Thị Như Quỳnh </li></ul>Scanner
  2. 2. What is scanner? <ul><li>An input device that scans (reads) the image as a series of dots and introduces the information into the computer’s memory. </li></ul><ul><li>(Infotech Glossary) </li></ul>
  3. 3. Some definition <ul><li>DPI </li></ul><ul><li>Electronic code </li></ul><ul><li>Digitized image </li></ul>
  4. 4. DPI <ul><li>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) </li></ul>
  5. 5. Electronic code <ul><li>A scanner ‘see’ images and converts the printed text or pictures into electronic codes that can be understood by the computer. </li></ul>Electronic code
  6. 6. Digitized image <ul><li>A representation of a two-dimensional image using ones and zeros (binary). </li></ul>
  7. 7. What is inside a scanner? <ul><li>Colored filter </li></ul><ul><li>Rotating lamps </li></ul><ul><li>Software for scanner </li></ul><ul><li>OCR software </li></ul>
  8. 8. Rotating lamps <ul><li>The scanner operates by using 3 rotating lamps which has a different colored filter </li></ul>
  9. 9. Colored filter <ul><li>It has 3 different colors: red, green and blue </li></ul>
  10. 10. Software for scanner <ul><li>Software for scanner translates the API procedure calls into primitive commands </li></ul><ul><li>Some common scanner software: </li></ul><ul><li>SANE (Scanner Access Now Easy) </li></ul><ul><li>TWAIN </li></ul><ul><li>ISIS (Image and Scanner Interface Specification) </li></ul><ul><li>WIA (Windows Image Acquisition) </li></ul><ul><li>(Wikipedia) </li></ul>
  11. 11. OCR software <ul><li>OCR (Optical Character Recognition) </li></ul><ul><li>OCR software let you easily convert images, such as digital photographs, scanned documents, printed books, etc. into text. </li></ul>
  12. 12. Flatbed scanner <ul><li>A scanner with a glass scanning surface on which objects are placed; similar to a photocopier. (Infotech Glossary) </li></ul>
  13. 13. How a flatbed scanner works? <ul><li>1: a flatbed scanner ‘see’ images and converts them into electronic codes. </li></ul>
  14. 14. <ul><li>2: The scanning unit moves across the image to be scanned </li></ul>How a flatbed scanner works?
  15. 15. Process of scanning a glass pane (platen) a bright light Charge-Coupled Devices
  16. 16. How a flatbed scanner works? <ul><li>3: It reads the image as a series of dots and then generates the digitized image. </li></ul>
  17. 17. <ul><li>4: Digitized image is sent to computer and stored as a file. </li></ul>How a flatbed scanner works?
  18. 18. <ul><ul><li>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. </li></ul></ul>Uses of Flatbed scanner
  19. 19. Thank you for your attention!

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