chaper-2 - Chapter­2 Chapter­2 Overview of Graphics...

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Unformatted text preview: Chapter­2 Chapter­2 Overview of Graphics Systems Topics: Video­display system Rater Scan systems Random scan systems Graphic monitors and workstations Input devices Hard­copy devices Graphics Software Video­Display Devices Video­Display Devices Refresh Cathode­Ray Tunes Fig.2­2 Basic design of a magnetic­deflection CRT Video­Display Devices Video­Display Devices Refresh Cathode­Ray Tunes Fig.2­3 Operation of an electron gun with an accelerating anode. Video­Display Devices Video­Display Devices Refresh Cathode­Ray Tunes Fig.2­4 Electrostatic deflection of the electron beam in a CRT Illumination of phosphor spots on back of CRT Video­Display Devices Video­Display Devices Fig.2­7 A raster –scan system displays an object as a set of discrete points across each scan line. Video­Display Devices Video­Display Devices Note at the Interlace mechanism of display: display the even lines in 1/60 of a second and then display the odd lines in next 1/60 seconds. Video­Display Devices Video­Display Devices Fig.2­9 A random­scan system draws the component lines of an object in any order specified. Video­Display Devices Video­Display Devices Video­Display Devices Video­Display Devices Fig.2­10 Operation of a delta­delta, shadow­mask CRT. Three electron guns, aligned with the triangular color­dot patterns on the screen, are directed to each dot triangle by a shadow mask. Fig.2­11 Basic design of a plasma­panel display device. Flat panel displays Flat panel displays Applying voltages to a pair of horizontal and vertical conductors causes the gas at the intersection of two conductors to break down into a glowing plasma of electron and ions. A plasma­panel display with a resolution of 2048 x 2048 and a screen diameter of 1.5 meters. Flat panel displays Flat panel displays Basic design of a thin­film electro­luminescent display device. Flat panel displays Flat panel displays Laptops use LCD display mechanism with different resolutions and different number of colors. Liquid­crystal displays (LCD) Liquid­crystal displays (LCD) By twisting the LCD Nematics, the polarized light passed through the horizontal conductor will twist and pass through the vertical conductor. This is how one pixel Becomes visible. How a Liquid­crystal displays (LCD) works. How a Liquid­crystal displays (LCD) works. The screen is refreshed in the rate of 60 frames per second As in emissive devices. To turn off a pixel, the LCD Nematics will be Forced to become Parallel. This is done by applying A voltage to both Horizontal and vertical conductors. Stereoscopic and Virtual­Reality Systems Stereoscopic and Virtual­Reality Systems Fig.2­19 Viewing a stereoscopic projection. Stereoscopic and Virtual­Reality Systems Stereoscopic and Virtual­Reality Systems Fig.2­20 A stereoscopic viewing pair. Stereoscopic and Virtual­Reality Systems Stereoscopic and Virtual­Reality Systems Fig.2­21 Glasses for viewing a stereoscopic scene and an infrared synchronizing emitter. Stereoscopic and Virtual­Reality Systems Stereoscopic and Virtual­Reality Systems Fig.2­22 A headset used in virtual­reality system Use of head­set, data gloves and a set of cords to transfer the data to a host computer. Interacting with a virtual­reality environment. Interacting with a virtual­reality environment. Fig.2­24 An ultrasound tracking device used with Fig.2­24 An ultrasound tracking device used with stereoscopic glass to track head position. Fig.2­25 The architecture of a simple raster graphics system. Raster­scan system Raster­scan system Fig.2­26 Architecture of a raster system with a fixed portion of the system memory reserved for the frame buffer. Raster­scan system Raster­scan system Raster­scan system Raster­scan system Raster­scan system Raster­scan system Fig.2­28 Basic video­controller refresh operations. Raster­scan system Raster­scan system Fig. 2­29 Architecture of a raster­graphics system with a display processor. How characters are displayed on a How characters are displayed on a Raster­scan system Limits in size, font type, etc. Possibilities to save fonts of different Sizes without the need to save a large bitmap. Random­scan systems Random­scan systems Fig.2­32 Architecture of a simple random­scan system. Graphics monitors and work­stations Graphics monitors and work­stations Fig.2­35 A very high­resolution (2560 x 2048) color monitor for Air traffic control application. Graphics monitors, A Media­Wall Graphics monitors, A Media­Wall Fig.2­36 The Media­Wall: A multi­screen display system. An image displayed on a 3­by­3 array of monitors. Applications in Airports, and places that we need to have live announcements. Graphics monitors and work­stations Graphics monitors and work­stations Multiple work­stations for a CAD group. Multiple work­stations for a CAD group. An artist’s work­station, featuring a color raster monitor, An artist’s work­station, featuring a color raster monitor, graphic tablet with hand cursor, a light tablet. Fig.2­42, Z mouse is used to displace Fig.2­42, Z mouse is used to displace objects in 3D space. The Z mouse features 3 buttons, a mouse ball underneath, a thumbwheel on the side, and a track ball on top. Fig.2­46, The Summa­Sketch III desktop tablet with a 16 button hand cursor. Digitizers. Digitizers. The Microgrid III tablet with 16 button hand cursor, designed for digitizing larger drawings. Digitizers. Digitizers. Fig.2­48 The NotePad desktop tablet with stylus. Digitizers. Digitizers. This devise is used for On line signature input, On line handwriting input And On­line drawing input to a PC. Some models of it can sense pressure, speed, and the direction of pressure. This is a perfect devise for on line signature recognition. Digitizers. Digitizers. Fig.2­49 An artist’s digitizer system, with a pressure sensitive Cordless stylus. Fig.2­50 A 3D digitizing system for use with Apple Macintosh computers. Digitizers. Digitizers. Fig.2­52 (Right) Drum scanner with a selectable resolution from 50 to 4000 dots per inch. Image Scanners Image Scanners Fig. 2­53 A large floor­model scanner used to scan architectural and engineering drawings up to 40 inches wide and 100 feet long. Scanner Scanner Fig. 2­54 Plasma panels with touch screens. Touch Screens Touch Screens How does a touch screen works. How does a touch screen works. An optical touch panel, showing the arrangement of infrared LED units and detectors around the edges of the frame. Light Pens Light Pens Fig.2­56 A light pen activated with a button switch. A speech­recognition system A speech­recognition system A picture generated on a dot­matrix printer. Note how the density of the dot patterns can be varied to produce light and dark areas. Hard copy devices Hard copy devices Hard copy devices Hard copy devices Fig.2­61 Floor model, ink­jet color printers that use variable dot size to achieve an equivalent resolution of 1500 to 1800 dots per inch. Hard copy devices used to print large Hard copy devices used to print large posters An electrostatic printer that can display 400 dots per inch. Pen Plotters Pen Plotters Fig.2­63, A desk­top pen plotter with a resolution of 0.025 mm. Pen Plotters Pen Plotters Fig.2­64 A large, roll­feed pen plotter with automatic multicolor 8­pen charger and a resolution of 0.0127 mm. Coordinate representation. Note at different levels of transformation before an object is actually displayed on monitor. Graphics Software, Graphics Software, ...
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This note was uploaded on 04/05/2010 for the course COMPUTER S 876 taught by Professor Ch during the Spring '10 term at Amirkabir University of Technology.

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