What is computer graphics?

1. Computer graphics involves display, manipulation and storage of pictures and

experimental data for proper visualization using computer systems.

2. It helps in displaying the information in the form of pictures/graphs/charts/ and diagrams

instead of text.

Computer Applications:

Practical Application of computer graphics

Keyboard

Keyboard is the most commonly used input devices.

They allow data entry into a computer system by pressing a set of keys neatly mounted

on a keyboard

Contains some extra command keys and function keys that affect the operation of

computer or keyboard itself

Types of keyboard :

(1). Standard keyboard

(2). Multimedia keyboard

(3).Wireless keyboard

Mouse

Mouse is the most popular point-and-draw device

It is a must-have input device on modern personal computers

Has 2 or 3 buttons and can be clicked or double-clicked to perform tasks

Optical mouse doesn’t have a ball but uses a laser to sense the motion

Types of mouse:

(1). Serial mouse

(2).PS/2 mouse

(3).Optical mouse

(4).Wireless mouse

Scanner

Data scanning devices are input devices used for direct data entry into a computer system from

source documents

Common scanner devices are:

(1).Magnetic Ink Character Recognition (MICR) reader :- used by banks to process

large volumes of cheques and drafts

(2).Optical Mark Reader (OMR) scanner :- scanning the answer sheet of an objective

type test in which answers are marked by darkening a square or circle space by pencil

(3).Optical Character Recognition (OCR) scanner :- used for direct reading of any

printed character

(4).Barcode reader :- used to read the barcodes printed on practically every item

purchased from a department store

DIGITAL CAMERA

1. A computer with a vision-input device consists of digital camera.

2. The camera creates an image of the object in digital form so that It can be stored and

interpreted by the compute.

3. The digitized image of the object is matched against similarly formed pre-stored images

in the computer’s image database.

Joystick

1. A joystick is a pointing device that works on the principle of trackball

2. To make the movement of the spherical ball easier, it is placed in a socket with a stick

mounted on it

3. On most joysticks, a button on the top is provided to select the option currently pointed to

by the cursor

4. Commonly used for controlling player movements in video or computer games

Working of Cathode Ray Tube and Shadow-Mask CRT

ARCHITECTURE OF RASTER SCAN

EXPALIN RASTER SCAN

WHAT IS RASTER SCAN

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