BY-
HEENA ABBASI
BCA
SECTION - D
CONTENTS---
 Introduction to scanners.
 Types of scanners –
I. Flatbed scanner.
II. Hand-held scanner.
III. Optical mark...
Scanners are input devices
which allow data entry from
source document directly.
 It is an input device, translates paper
document into electronic format, as an input
to a computer.
 Input can be type,...
 Eliminate manual entry of data , thus
improves data accuracy.
 Automatic entry of data with their use
improves data acc...
Types of scanner---
FLATBED SCANNER
HAND-HELD SCANNER
 It is like a copier machine.
 Consist of a box having a
glass plate on its top, lid
that covers a glass plate.
 Activa...
 If a document stored in the computer as an
image instead of text , than it is not possible
to do any word processing.
 ...
 It is a scanner , which recognize pre-
specified type of mark made by pencil or
pen.
 The technique used by OMR devices...
 A plotter is an ideal output device for
architects, city planners, engineers' and
others who need to generate high preci...
Two types of
plotters are-
Drum plotter
Flatbed plotter
 It consist of a drum, 1 or
more penholders mounted
perpendicular to the drum’s
surface.
 Drum rotates both clockwise
an...
 Consist of a rectangular
flatbed table, 1 or more
penholder mounted
perpendicular to the table’s
surface.
 A graph plot...
scanners and plotters
scanners and plotters
scanners and plotters
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scanners and plotters

  1. 1. BY- HEENA ABBASI BCA SECTION - D
  2. 2. CONTENTS---  Introduction to scanners.  Types of scanners – I. Flatbed scanner. II. Hand-held scanner. III. Optical mark reader.  Limitation of image scanners.  Introduction to plotters.  Types of plotters- I. Drum plotter. II. Flatbed plotter.
  3. 3. Scanners are input devices which allow data entry from source document directly.
  4. 4.  It is an input device, translates paper document into electronic format, as an input to a computer.  Input can be type, text, pictures, even handwritten material also.  Useful for preserving paper documents, a document stored in computer does not deteriorate in quality with age.  It can be printed or displayed whenever required. We can also alter and manipulate the stored images.
  5. 5.  Eliminate manual entry of data , thus improves data accuracy.  Automatic entry of data with their use improves data accuracy , increase timeliness of information processed.  Demand high quality source document , rejects-poorly typed documents or strikeover documents or documents having erasures.  Form design and ink specification is more critical with the use of these devices as compare to keyboard for data entry.
  6. 6. Types of scanner--- FLATBED SCANNER HAND-HELD SCANNER
  7. 7.  It is like a copier machine.  Consist of a box having a glass plate on its top, lid that covers a glass plate.  Activated glass plate moves horizontally from one end to another.  After scanning one line, light beam moves up a little to scan other line , process continues till the scanning finishes.  Takes 20 seconds to scan a document of 21*28 cm in size.  They are costly as compare to hand-held scanner.  User can hold them in hand conveniently.  It has a case of light emitting diodes incased in a small case.  For scanning, user drags it slowly from one end to other of a document when its light is on.  User must drag it slowly and smoothly for the correct conversion of document to its equivalent bit map.  User use them when they have less number of documents.  They are cheaper than flatbed scanner.
  8. 8.  If a document stored in the computer as an image instead of text , than it is not possible to do any word processing.  Storage space required for storing the document as an image is much more than that required for storing a text document.
  9. 9.  It is a scanner , which recognize pre- specified type of mark made by pencil or pen.  The technique used by OMR devices for recognition of marks on document involves–: Focusing a light beam on the document and detecting the reflected light pattern from the marks.
  10. 10.  A plotter is an ideal output device for architects, city planners, engineers' and others who need to generate high precision, hard copy, graphic output of varying size.
  11. 11. Two types of plotters are- Drum plotter Flatbed plotter
  12. 12.  It consist of a drum, 1 or more penholders mounted perpendicular to the drum’s surface.  Drum rotates both clockwise and anti-clockwise to produce vertical motion.  The pens move right to left and left to right to produce horizontal motion.  Graph plotting software controls the movement of drum and pens.  User can produce multi colored designs by mounting pens having ink in different colors in different folders.
  13. 13.  Consist of a rectangular flatbed table, 1 or more penholder mounted perpendicular to the table’s surface.  A graph plotting software is also there.  Plots design on paper sheet spread and fix over the table.  Paper doesn’t move and pen holder provide all necessary motion to draw designs.  Plot size restricted by the area some are as small as A4 size and some are very large to make designs of bed , ships , aircraft etc.  Some plotters also etch on plastic and metal plates , for that the pen has a sharp- edged needle.

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