CG-lecture06 - Computer Graphics Computer Graphics Lecture...

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Computer Graphics OpenGL Computer Graphics Lecture 6 Graphic System and Raster (Pixel) Graphics
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27/9/2005 Lecture 2 2 Computer Graphics OpenGL 1. Framework for Interactive Graphics Application Model Application Program Graphics Library (GL) Graphics System
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27/9/2005 Lecture 2 3 Computer Graphics OpenGL 1. Framework for Interactive Graphics User interaction results in modification of model Application program maps objects to images by calling on graphics library Graphics library (e.g., OpenGL, DirectX) is intermediary between application and the display hardware (Graphics System)
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27/9/2005 Lecture 2 4 Computer Graphics OpenGL 2. Graphics System Input: mouse, keyboard, joystick, tablet, scanner, live video streams Processing (processor and memory): respond to input and convert geometric entities to pixels in the frame buffer Output: CRT/LCD display , printer, video recorder
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27/9/2005 Lecture 2 5 Computer Graphics OpenGL 3. Graphics Display Hardware Vector Scan: (calligraphic, stroke, random scan) Raster Scan: (TV, bitmap, pixel image)
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27/9/2005 Lecture 2 6 Computer Graphics OpenGL (1) Vector Display How to generate an image using vectors A line is represented by endpoints (10,10) to (90,90) The points along the line are computed using a line equation y = mx + b If you want the image larger, no problem…
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27/9/2005 Lecture 2 7 Computer Graphics OpenGL (2) Raster Display How to generate a line using rasters A line is represented by assigning some pixels a value of 1 The entire line is specified by the pixel values What do we do to make image larger? Lot’s of extra info to communicate, but no computation
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27/9/2005 Lecture 2 8 Computer Graphics OpenGL (3) Display technologies: CRTs Raster Displays Pixel: One dot or picture element of the raster Scan line: A row of pixels Raster: A rectangular array of points or dots
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27/9/2005 Lecture 2 9 Computer Graphics OpenGL Raster scanning theory o o o o o o o o o o o o o o o o o o o r 2-7 CRT v O o o o o o o o o o o
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27/9/2005 Lecture 2 10 Computer Graphics OpenGL (3.1) Raster Display o 0 1 2 3 n ˜ l ( v ) ( l ( v ) ˜ l ( v ) 2-16
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27/9/2005 Lecture 2 11 Computer Graphics OpenGL Color display r l o o o r l 2-8 V
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This note was uploaded on 06/12/2011 for the course ECON 101 taught by Professor Professor during the Spring '10 term at Cisco Junior College.

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CG-lecture06 - Computer Graphics Computer Graphics Lecture...

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