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lec1 - Computer Graphics. Instructor : Haya Sammaneh. Computer Graphics. Computer advances rapidly Computer Graphics used in almost fields such as: Science Art Engineering Training Entertainment Education Medicine. Computer Graphics. Open GL

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Lec1 computer graphics

lec1-Computer Graphics

Instructor : HayaSammaneh

Computer graphics
Computer Graphics

  • Computer advances rapidly

  • Computer Graphics used in almost fields such as:

    • Science

    • Art

    • Engineering

    • Training

    • Entertainment

    • Education

    • Medicine

Computer graphics1
Computer Graphics

  • Open GL

  • GLUT[Graphics Library Utility Toolkit] : combine Open GL with windows system

What is computer graphics
What is computer graphics?

Imaging= representing 2D images

Modeling = representing 3D objects

Rendering = constructing 2D images from 3D models

Animation= simulating changes over time

Graphics applications
Graphics- Applications

• Graphics and Chart

  • Entertainment

  • Computer-aided design

  • Scientific visualization

  • Training

  • Education

Graphics and chart
Graphics and Chart

  • Used to display simple data graphs

  • Show data relationship

  • Used to summarize statistical , mathematical , engineering and scientific data.

  • Example

    • Line graph

    • Bar graph

    • Pie charts

    • Surface charts

    • Contour plots

Application cad we apply modeling lighting and rendering
Application, CAD we apply modeling, lighting and rendering


  • Pixel [Picture Element]: it is infinities of points with very small size.

  • Resolution: is a number of pixel per unit area

  • Higher resolution  better display

  • Aspect Ratio: is a factor to obtain equal length

    Example : draw square


  • Display: have a finite number of pixels found on screen

  • Monochrome: need only one bit [on, off]

  • Color Monitor: need more than one bit [on, off, color]

1 image processing composition and morphing
1- Image ProcessingComposition and Morphing

Image Morphing: The idea is to create a sequence of intermediate images, which when put together with the original images, represents the transition from one image to the other.

Image Morphing

2 rendering
2- Rendering

Rendering is the process of generating an image from a model, by means of computer programs.

The model is a description of 3D objects.

The model would contain geometry,viewpoint, texture, lighting, and shading information.

What is an image
What is an Image?

  • An image is a 2D rectilinear array of pixels

Display hardware
Display Hardware

Video display devices

» Cathode Ray Tube (CRT)

» Liquid Crystal Display (LCD)

  • Plasma panels

  • Thin-film displays

  • Light-emitting diodes (LED)

    Hard-copy devices

  • Ink-jet printer

  • Laser printer

  • Pen plotter

  • Cathode ray tube crt
    Cathode Ray Tube-CRT

    • Basic Operation:

    • a beam of electrons is emitted by an electron gun and passes through focusing and deflection system that direct the beam toward specified positions on the phosphor-coated screen

    • Phosphor emits a small spot of light at each position and fades very rapidly

    Cathode ray tube crt1
    Cathode Ray Tube-CRT

    • Need to redraw the picture repeatedly by quickly directing the electron beam back over the same screen points (Refresh CRT)

    • Refresh Rate: is the frequency of which a picture is redrawn on the screen