Raster and Vector Devices

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Information about Raster and Vector Devices

Published on November 17, 2008

Author: DOA_CHD

Source: authorstream.com

Slide 1: RASTER AND VECTOR DEVICES OM Slide 2: RASTER AND VECTOR DEVICES BHARAT BHUSHAN SHARMADATE :23/11/2008 MCA-5 Computer Hardware for Graphics : Computer Hardware for Graphics Devices : Devices Slide 5: • Alphanumeric input- (Keyboards) • 2D Inputs - (Joystick, Mouse, ..etc) • 3D Inputs - (Glove, Space Ball) • Image Inputs - (Camera, Scanner) • Display Devices - (CRTs, Monitors) • Hard Copy Devices - (Printers, Plotters) 2.Output devices 1.Input Devices Slide 6: Alphanumeric input- (Keyboards) 2D Inputs - (Joystick, Mouse, ..etc) 3D Inputs - (Glove, Space Ball) Image Inputs - (Camera, Scanner) 1.Input Devices Slide 7:  3D Inputs – Glove –A modern attempt to provide the user with more degrees of Freedom –Common in Virtual Reality applications –Polyhemus can provide six degrees of freedom (rotation and translation) 1.Data Globes Slide 8: 3D Inputs – Space Ball Six degrees of freedom sphere 2.Space Ball Slide 9: Although primary a display device, it can also track position and orientation like Polhemus 3.Head Mounted Display Slide 10: Image Inputs – camera And Scanner Captures an array of image pixels CCD Array CCD Array 4.Video Camera :  • Raster Devices - (CRTs, Monitors)• Vector (Hard Copy )Devices - (Printers, Oscilloscope ,Plotters) Devices Output :  Output Devices:• Raster Devices - (CRTs, Monitors) Slide 13: CRT - the common display device for personal computers. LCD - A smaller, lighter, lower power replacement for the CRT. LED - A smaller, lighter, lower power replacement for the CRT. Plasma screens - a more expensive but brighter alternative to LCDs. Printers - today's printers are good for both text and graphics. Raster Devices Slide 14: Cathode electron gun shadow mask and phosphor coated screen deflection yoke focusing anode CRT - the common display device for personal computers. CRT (Cathode Ray Tube) :  • Vector (Hard Copy )Devices – ( Oscilloscope ,Plotters) Output Devices :  IPlotters Slide 17: A graphics printer that draws images with ink pens. It actually draws point-to-point lines directly from vector graphics files. The plotter was the first computer output device that could print graphics as well as accommodate full-size engineering and architectural drawings. Using different colored pens, it was also able to print in color long before inkjet printers became an alternative.Pen plotters are still the most affordable printing device for CAD use and offer resolution unlike any other printer. The lines are not made up of dots. They are actually drawn, providing infinite resolution. See drum plotter, flatbed plotter, electrostatic plotter and inkjet printer. Defination : Plotter Slide 18: Both types of plotters actually "draw" the images. The drum plotter (left) wraps the paper around a drum with pin feeds. It moves the paper back and forth for one direction of the plot. The pens move across the paper, creating the other axis. The bed of the flatbed unit (right) determines the maximum size of the total drawing. Drum and Flatbed Plotters Slide 19: Pen plotters use drawing pens that provide infinite resolution, because the lines are actually drawn. All other printing devices print dots. Drawing Pens Slide 20: A plotter is a vector graphics printing device that connects to a computer. Inkjet Plotters Slide 21: Roland's LTX thermal plotters provide quick, cost-effective CAD output for large scale plots. LTX plotters are fast, accurate and maintenance free. Fully HPGL compatible. Size “D”, 200 DPI plots can be printed in less than one minute. These are Roland’s top-of-the-line thermal style HP-GL/2 compatible plotting machines, complete with vector to raster converter, 25mm/sec. speed, 2 line LCD, parallel/serial interface and autocut paper. 32 bit RISC CPU for speed, never need toner, ink cartridge, ribbons or other expendables. Thermal Plotters Slide 22: Roland RSX340 (D) and RSX440 (E) electrostatic plotters produce highest quality work at a fraction of the competitors price. On-board 32 bit RISC processor achieves plotting speeds 10 to 20 times faster than pen plotters, handles long plot data 13 meters (340) and 19 meters (440), HP-GL, HP-GL/2, 2 line LCD, parallel/serial, and autocut paper roll. Electrostatic Plotters Slide 23: Acquired from a major aerospace corporation, California Digital offers the Hewlett Packard 7475A plotter. The plotters have come out of service, but are in perfect condition. About 70 pieces of both the HP-7475A  are available. The 7475A is a six pen size “B” plotter with a .001 inch pen resolution. Pen velocity: 15 ips, 1024 byte buffer, 2G acceleration. HP Plotter Slide 24: Roland Digital drafting stands can be modified for use digitizers or other plotters. Unit can be used horizontally or to 80 degrees vertical. Equipped with casters for easy movement on all types of flooring. Lower shelves included. Dimensions of these solid tubular stands are 36" wide, 27" deep and 29" high. Weight 55 lbs. Originally designed for use with Roland with DPX series plotters. Plotters & Digitizer Stand :  IIOscilloscope Slide 26: Defination : Oscilloscope An oscilloscope is a type of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensional graph of one or more electrical potential differences (vertical axis) plotted as a function of time or of some other voltage (horizontal axis). The oscilloscope is one of the most versatile and widely-used electronic instruments. Slide 27: Oscilloscopes are widely used when it is desired to observe the exact wave shape of an electrical signal. In addition to the amplitude of the signal, an oscilloscope can measure the frequency, show distortion, and show the relative timing of two related signals. Oscilloscopes are used in the sciences, medicine, engineering, telecommunications, and industry. General-purpose instruments are used for maintenance of electronic equipment and laboratory work. Special-purpose oscilloscopes may be used for such purposes as adjusting an automotive ignition system, or to display the waveform of the heartbeat. Originally all oscilloscopes used cathode ray tubes as their display element, but modern digital oscilloscopes use high-speed analog-to-digital converters and computer-like display screens and processing of signals. Oscilloscope peripheral modules for general purpose laptop or desktop personal computers can turn them into useful and flexible test instruments. Slide 28: Illustration showing the interior of cathode-ray tube for use in an oscilloscope. Numbers in the picture indicate:1. Deflection voltage electrode;2. Electron gun; 3. Electron beam; 4. Focusing coil;5. Phosphor-coated inner side of the screen The Agilent Infinii Vision 7000 Series is a digital storage oscilloscope which can capture and analyze analog and digital signals A Tektronix model 475A portable analogue oscilloscope, a very typical instrument of the late 1970s Slide 29: A digital storage oscilloscope manufactured by Agilent Technologies The digital storage oscilloscope, or DSO for short, is now the preferred type for most industrial applications, although simple analogue CROs (Cathode-ray oscilloscope) are still used by hobbyists. It replaces the unreliable storage method used in analogue storage scopes with digital memory, which can store data as long as required without degradation. It also allows complex processing of the signal by high-speed digital signal processing circuits. 1.Digital Storage Oscilloscope Slide 30: Lower cost than a stand-alone oscilloscope, assuming the user already owns a PC. Professional-grade PCO hardware (e.g. with bandwidth in the MHz rather than in the kHz range) tends to be more expensive than e.g. a typical PCI sound card, and some can even cost more than a new PC [1]. Easy exporting of data to standard PC software such as spreadsheets and word processors. Ability to control the instrument by running a custom program on the PC. Use of the PC's networking and disc storage functions, which cost extra when added to a self-contained oscilloscope 2.PC-Based Oscilloscope (PCO) Slide 31: Difference Between Raster & Vector Devices Slide 32: Vector Display:

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