Flatbed scanner
description
Transcript of Flatbed scanner
Flatbed Scanner
ABIN V ARKKATTU
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.
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.
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).
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.
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)
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.
How does it works ?
How a flatbed scanner works?• 1: a flatbed scanner ‘see’ images and
converts them into electronic codes.
• 2: The scanning unit (CCD) 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
• 3: It reads the image as a series of dots and then generates the digitized image.
How a flatbed scanner works?
• 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
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.
ADF(Automatic Document Feeder)
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
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
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
PROPRETIES OF FLATBEDSCANNER Speed and Productivity 27 pages /minute (Black &white)
11 pages/minute (Color)
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.
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.
Thank you for your attention! enjoy your
day