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