1. Graphics-1 Gentle Introduction to Computer Graphics (1) Based on: –David Brogan’s “Introduction to Computer Graphics” Course Slides, University of Virginia –Jack van Wijk’s “Computer Graphics” Course Slides, University of Eindhoven.

2. Graphics-2 Outline Graphics Applications What is Computer Graphics Representations in Graphics Supporting Disciplines

3. Graphics-3 Graphics Applications Entertainment: Cinema Pixar: Monster’s Inc. A Bug’s Life (Pixar)

4. Graphics-4 Graphics Applications Medical Visualization MIT: Image-Guided Surgery Project The Visible Human Project

5. Graphics-5 Graphics Applications Scientific Visualization

6. Graphics-6 Graphics Applications Computer Aided Design (CAD)

7. Graphics-7 Graphics Applications Training Designing Effective Step-By-Step Assembly Instructions (Maneesh Agrawala et. al)

8. Graphics-8 Graphics Applications Games GT Racer 3 Polyphony Digital: Gran Turismo 3, A Spec

9. Graphics-9 Graphics Applications Games Circus Atari (Atari)

10. Graphics-10 Graphics Applications The major application that we will be dealing with extensively in the next coming lectures is that of developing graphical user interfaces –Windows –Menus –Buttons –Textboxes –...

11. Graphics-11 What is Computer Graphics? Computer graphics: generating 2D images of a 3D world represented in a computer. Main tasks: –modeling: (shape) creating and representing the geometry of objects in the 3D world –rendering: (light, perspective) generating 2D images of the objects –animation: (movement) describing how objects change in time

12. Graphics-12 Representations in graphics Vector Graphics Image is represented by continuous geometric objects: lines, curves, etc. Raster Graphics Image is represented as a rectangular grid of colored pixels –PIXEL = PIcture ELement X

13. Graphics-13 Raster graphics Generic Image processing techniques Geometric Transformation: loss of information Relatively high processing time – in terms of the number of pixels Realistic images, textures,... Examples: Paint, PhotoShop,...

14. Graphics-14 Sample Image Processing Techniques Edge Detection Image Denoising

15. Graphics-15 Vector graphics Graphics objects: geometry + color Relatively low processing time – in terms of the number of graphic objects Geometric transformation possible without loss of information (zoom, rotate, …) Examples: PowerPoint, CorelDraw, SVG,...

16. Graphics-16 Scalable Vector Graphics (SVG) <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="12cm" height="4cm" viewBox="0 0 1200 400" xmlns="http://www.w3.org/2000/svg" version="1.1"> Example polygon01 - star and hexagon <rect x="1" y="1" width="1198" height="398" fill="none" stroke="blue" stroke-width="2" /> <polygon fill="red" stroke="blue" stroke-width="10" points="350,75 379,161 469,161 397,215 423,301 350,250 277,301 303,215 231,161 321,161" /> <polygon fill="lime" stroke="blue" stroke-width="10" points="850,75 958,137.5 958,262.5 850,325 742,262.6 742,137.5" />

17. Graphics-17 In Summary ImageMath. Model Image Analysis (pattern recognition) Image Synthesis (Rendering) ModelingImage processing

18. Graphics-18 Supporting Disciplines Computer science (algorithms, data structures, software engineering, …) Mathematics (geometry, numerical, …) Physics (Optics, mechanics, …) Psychology (Colour, perception) Art and design