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

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Presentation transcript:

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.

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

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

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

Graphics-5 Graphics Applications Scientific Visualization

Graphics-6 Graphics Applications Computer Aided Design (CAD)

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

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

Graphics-9 Graphics Applications Games Circus Atari (Atari)

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 –...

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

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

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,...

Graphics-14 Sample Image Processing Techniques Edge Detection Image Denoising

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,...

Graphics-16 Scalable Vector Graphics (SVG) <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" " <svg width="12cm" height="4cm" viewBox=" " xmlns=" 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" /> <polygon fill="lime" stroke="blue" stroke-width="10" points="850,75 958, , , , ,137.5" />

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

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