Presentation about scanner and flatbed scanner

1. Flatbed
Scanner
ABIN V ARKKATTU

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.

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.

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. BIT DEPTH
• It is the ability of the scanner to capture
different colors.
• The resolution and color of the scanned image
is depends on BIT DEPTH of the scanner.

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

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

10. Colored filter
• It has 3 different colors: RED, GREEN and
BLUE.

11. 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)

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

13. Flatbed scanner
• A scanner with a glass scanning surface
on which objects are placed; similar to a
photocopier.

14. How does it works ?

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

16. • 2: The scanning unit (CCD) moves across
the image to be scanned
How a flatbed scanner works?

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

18. • 3: It reads the image as a series of dots
and then generates the digitized image.
How a flatbed scanner works?

19. • 4: Digitized image is sent to computer
and stored as a file.
How a flatbed scanner works?

20. 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

21. PROPRETIES OF FLATBED SCANNER
• Because of its non movement we can expect
more quality output and risk is low.
• ADF is a feature which takes several pages
and feeds the paper one page at a time into a
scanner or copier, allowing the user to scan,
and thereby copy, print, or fax, multiple-page
documents without having to manually
replace each page.

22. ADF(Automatic Document Feeder)

23. PROPRETIES OF FLATBED SCANNER
Scanning Sizes
• It is different in different level flatbed scanners
• A) Entry level flatbed scanner
8.5 – 11.7 inch size of documents we can scan
300 – 600 dpi
8 bit depth

24. PROPRETIES OF FLATBED SCANNER
Scanning Sizes
• B) Mid level flatbed scanner
12 – 14 inch size of documents we can scan
600 – 1200 dpi
10 bit depth

25. PROPRETIES OF FLATBED SCANNER
Scanning Sizes
• C) High end flatbed scanner
14 – 24 inch size of documents we can scan
<1200 dpi
16 bit depth

26. PROPRETIES OF FLATBEDSCANNER
Speed and Productivity
27 pages /minute (Black &white)
11 pages/minute (Color)

27. PROPRETIES OF FLATBEDSCANNER
Additional Features
• Flatbed scanners connect to your computer
via a Universal Serial Bus connection.
• Some flatbed scanners are even capable of
interfacing with computer networks so
multiple computers and users can access the
devices.

28. Advantages And Disadvantages Of
Flatbed Scanner
• The main advantage is the ability to scan poor quality
or nonstandard weight paper.
• By using ADF(Automatic Document Feeder ) we can
scan both sides of an image.
• A flatbed scanner can scan larger document, and
without bending them.
• A scanner gets dusty really quickly therefore
scratching the glass.
• Low cost.
• User friendly.

29. Thank you for your
attention!  enjoy your day