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.
- Spring '10