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lec1 - Computer Graphics

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

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  1. lec1-Computer Graphics Instructor : HayaSammaneh

  2. Computer Graphics • Computer advances rapidly • Computer Graphics used in almost fields such as: • Science • Art • Engineering • Training • Entertainment • Education • Medicine

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

  4. What is computer graphics? Imaging= representing 2D images Modeling = representing 3D objects Rendering = constructing 2D images from 3D models Animation= simulating changes over time

  5. Graphics- Applications • Graphics and Chart • Entertainment • Computer-aided design • Scientific visualization • Training • Education

  6. 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

  7. Application

  8. Application, CAD we apply modeling, lighting and rendering

  9. Application

  10. Application

  11. Application

  12. Application

  13. Definitions • 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

  14. Definitions • 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]

  15. Computer Graphics

  16. 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

  17. 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.

  18. 3- Modeling

  19. 4- Animations

  20. What is an Image? • An image is a 2D rectilinear array of pixels

  21. Pixel

  22. 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

  23. Image Display : CRT

  24. 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

  25. 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

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