The document defines and describes scanners and how they work. A scanner is an input device that scans images as a series of dots and introduces the information into the computer's memory. Scanners use rotating lamps with red, green, and blue filters to digitize images. Software then converts the scanned images into electronic codes that computers can understand. Flatbed scanners have a glass surface where objects are placed to be scanned by a scanning unit that moves across the image, converting it into a digitized file sent to the computer.

1. Ngô Thùy Trang Nguyễn Ngọc Tiến Trần Thị Thùy Hương Lê Việt Tiên Phạm Thị Như Quỳnh Scanner

2. 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)

3. Some definition DPI Electronic code Digitized image

4. 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)

5. 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

6. Digitized image A representation of a two-dimensional image using ones and zeros (binary).

7. What is inside a scanner? Colored filter Rotating lamps Software for scanner OCR software

8. Rotating lamps The scanner operates by using 3 rotating lamps which has a different colored filter

9. Colored filter It has 3 different colors: red, green and blue

10. 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)

11. OCR software OCR (Optical Character Recognition) OCR software let you easily convert images, such as digital photographs, scanned documents, printed books, etc. into text.

12. Flatbed scanner A scanner with a glass scanning surface on which objects are placed; similar to a photocopier. (Infotech Glossary)

13. How a flatbed scanner works? 1: a flatbed scanner ‘see’ images and converts them into electronic codes.

14. 2: The scanning unit moves across the image to be scanned How a flatbed scanner works?

15. Process of scanning a glass pane (platen) a bright light Charge-Coupled Devices

16. How a flatbed scanner works? 3: It reads the image as a series of dots and then generates the digitized image.

17. 4: Digitized image is sent to computer and stored as a file. How a flatbed scanner works?

18. 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

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