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Chapter-2 Overview of Graphics Systems

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Chapter-2 Overview of Graphics Systems

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    1. Chapter-2 Overview of Graphics Systems Topics: Video-display system Rater Scan systems Random scan systems Graphic monitors and workstations Input devices Hard-copy devices Graphics Software

    2. Video-Display Devices Refresh Cathode-Ray Tunes

    3. Video-Display Devices Refresh Cathode-Ray Tunes

    4. Video-Display Devices Refresh Cathode-Ray Tunes

    5. Video-Display Devices Illumination of phosphor spots on back of CRT

    6. Video-Display Devices Fig.2-7 A raster –scan system displays an object as a set of discrete points across each scan line.

    7. Video-Display 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.

    8. Video-Display Devices Fig.2-9 A random-scan system draws the component lines of an object in any order specified.

    9. Video-Display Devices Fig.2-10 Operation of a delta-delta, shadow-mask CRT. Three electron guns, aligned with the triangular color-dot patterns on the screen, are directed to each dot triangle by a shadow mask.

    10. Flat panel displays Fig.2-11 Basic design of a plasma-panel display device.

    11. Flat panel displays A plasma-panel display with a resolution of 2048 x 2048 and a screen diameter of 1.5 meters.

    12. Flat panel displays Basic design of a thin-film electro-luminescent display device.

    13. Liquid-crystal displays (LCD) Laptops use LCD display mechanism with different resolutions and different number of colors.

    14. How a Liquid-crystal displays (LCD) works. By twisting the LCD Nematics, the polarized light passed through the horizontal conductor will twist and pass through the vertical conductor.

    15. Stereoscopic and Virtual-Reality Systems Fig.2-19 Viewing a stereoscopic projection.

    16. Stereoscopic and Virtual-Reality Systems Fig.2-20 A stereoscopic viewing pair.

    17. Stereoscopic and Virtual-Reality Systems Fig.2-21 Glasses for viewing a stereoscopic scene and an infrared synchronizing emitter.

    18. Stereoscopic and Virtual-Reality Systems Fig.2-22 A headset used in virtual-reality system

    19. Interacting with a virtual-reality environment. Use of head-set, data gloves and a set of cords to transfer the data to a host computer.

    20. Fig.2-24 An ultrasound tracking device used with stereoscopic glass to track head position.

    21. Raster-scan system Fig.2-25 The architecture of a simple raster graphics system.

    22. Raster-scan system Fig.2-26 Architecture of a raster system with a fixed portion of the system memory reserved for the frame buffer.

    23. Raster-scan system

    24. Raster-scan system

    25. Raster-scan system

    26. How characters are displayed on a Raster-scan system

    27. Random-scan systems

    28. Graphics monitors and work-stations

    29. Graphics monitors, A Media-Wall

    30. Graphics monitors and work-stations

    31. Multiple work-stations for a CAD group.

    32. An artist’s work-station, featuring a color raster monitor, graphic tablet with hand cursor, a light tablet.

    33. Fig.2-42, Z mouse is used to displace objects in 3D space.

    34. Digitizers. Fig.2-46, The Summa-Sketch III desktop tablet with a 16 button hand cursor.

    35. Digitizers. The Microgrid III tablet with 16 button hand cursor, designed for digitizing larger drawings.

    36. Digitizers. Fig.2-48 The NotePad desktop tablet with stylus.

    37. Digitizers.

    38. Digitizers. Fig.2-50 A 3D digitizing system for use with Apple Macintosh computers.

    39. Image Scanners Fig.2-52 (Right) Drum scanner with a selectable resolution from 50 to 4000 dots per inch.

    40. Scanner Fig. 2-53 A large floor-model scanner used to scan architectural and engineering drawings up to 40 inches wide and 100 feet long.

    41. Touch Screens Fig. 2-54 Plasma panels with touch screens.

    42. How does a touch screen works.

    43. Light Pens

    44. A speech-recognition system

    45. Hard copy devices A picture generated on a dot-matrix printer. Note how the density of the dot patterns can be varied to produce light and dark areas.

    46. Hard copy devices

    47. Hard copy devices used to print large posters

    48. Pen Plotters

    49. Pen Plotters

    50. Graphics Software, Coordinate representation. Note at different levels of transformation before an object is actually displayed on monitor.

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