Computer Graphics: Line Generation Unit 1 Part 1

Que1.1. What’s computer plates? Explain important operations of computer plates. Answer 1. Computer plates is an art of drawing filmland on computer defenses with the help of programming. 2. It involves calculation, creation, manipulation of data. 3. Computer plates is a picture tool for the generation and manipulation of images. operations of computer plates 1. Graphical stoner Interface( GUI) Computer plates tools is used to make GUI. 2. Computer trades Computer plates are used in designing object shapes and specifying object similar as cartoon delineation, totem design. 3. Education and training Computer generated models of physical fiscal and profitable systems are used as educational aids. Learning with visual aids is presto, easy to understand and bring effective. 4. Entertainment Graphics and image processing ways can be used to transfigure an object into another object. 5. Visualization Visualization is used to convert large data value into patterns, maps, graphs,etc., with the help of computer plates. 6. donation plates With the help of computer plates large volumes of business data can be presented fluently, making it seductive and useful. Que1.2. bandy the colorful types of computer plates. Answer colorful types of computer plates are 1. Passive( out- line) computer plates The most common illustration of unresistant computer plates is stationary website, where stoner has no control over the contents on the examiner. In this, development takes place singly in out- line mode. 2. Interactive computer plates In interactive computer plates, stoner can interact with the machine as per his conditions. Videogames, dynamic websites, special goods in pictures, cartoons are all making use of interactive computer visual. Computer plates can be astronomically divided into the following classes 1. Business plates or the broader order of donation plates, which refers to plates, similar as bar- maps( also called histograms), pie maps, pictograms( i.e., gauged symbols),x-y maps,etc., used to present quantitative information to inform and move the followership. 2. Scientific plates, similar asx-y plots, wind fitting, figure plots, system or program flowchartsetc. 3. Gauged delineation, similar as architectural representations, delineation of structures, islands, and machines. 4. Cartoons and artwork, including announcements. 5. Graphical stoner Interfaces( GUIs) which are the images that appear on nearly all computer defenses these days, designed to help the stoner use the software without having to relate to primers or read a lot of textbook on the examiner. Que1.3. List some advantages and disadvantages of interactive computer plates. Answer Advantages of interactive computer plates 1. It provides tools for producing filmland of concrete, ‘ real- world ’ objects. 2. It has an capability to show moving filmland, and therefore it’s possible to produce robustness with interactive plates. Disadvantages of interactive computer plates 1. Requires specialized skill to produce. 2. Must be streamlined daily to keep followership engaged. Que1.4. Explain raster checkup display and arbitrary checkup display device. AKTU 2012- 13, Marks 05 OR separate between raster checkup display and arbitrary checkup display with illustration. Answer Raster checkup display 1. In raster checkup displays, screen is scrutinized in vertical and perpendicular direction and the information is stored in a buffer called frame buffer. 2. The frame buffer is used to store intensity values of all screen points. 3. It’s suitable for displaying realistic scenes containing either complex tones or colour patterns. 4. Simple black and white display bear only one bit per pixel while colour display systems bear multiple bits per pixel. 5. stimulating on raster checkup displays is carried out at the rate of 60 to 80 frames per second. Random checkup display 1. In arbitrary checkup display, the description of picture is stored as a collection of line of commands in an area of memory called refresh buffer or display program. 2. Random checkup display draw a picture on line at a time and for this reason is also appertained to as vector displays. 3. It’s principally designed for line delineation and not suitable for complex natural scenes. 4. It refreshes at a rate of 30 to 60 frames per second. Que1.5. Explain the advantages of raster checkup display over arbitrary checkup display. Answer The advantages of raster checkup display over arbitrary checkup display 1. lower memory costs than arbitrary checkup display. 2. High degree of literalism achieved in picture than arbitrary checkup display. 3. It uses advanced shading and retired face fashion. 4. Computer observers and TVs use this system. 5. Less precious than vector display. 6. veritably effective to represent full images. Que1.6. What’s interlacing? Answer 1. Interlacing is a system of garbling a bitmap image similar that a person who has incompletely entered it, sees a degraded dupe of the entire image. 2. When communicating over a slow dispatches link, this is frequently preferable to seeing a impeccably clear dupe of one part of the image, as it helps the bystander to decide more snappily whether to repeal or continue the transmission. 3. It’s also known as interleaving. Que1.7. Explain the working of Cathode Ray Tube( CRT). Answer Working of CRT 1. CRT is an vacated glass tube equipped with colorful factors as shown inFig.1.7.1. 2. A ray of electrons( cathode shafts), emitted by an electron gun, passes through fastening and deviation systems hits on the phosphor carpeted screen to induce the asked picture. 3. The high speed electrons hit the phosphor carpeted screen to produce a spot of light controlled by a videotape regulator. 4. The electron gun in the CRT is made up of a heated essence cathode and a control grid. 5. The cathode is hotted
by passing a current through a coil of line, called the hair. 6. The electrons get boiled off the hot cathode face and move in the form of electron shafts passing through vertical and perpendicular deviation plates. 7. The negatively charged electrons are accelerated towards the phosphor coating by a high positive voltage. 8. The accelerating voltage can be generated with a appreciatively charged essence coating on the inside of the CRT or by an accelerating anode. 9. Spots of light are produced when high speed electrons in the electron ray collide with the phosphor coating and their kinetic energy is absorbed by the phosphor. 10. Part of the ray energy is converted by disunion into heat energy and the remaining energy is used to move electrons in the phosphor snippet into advanced energy situations. 11. After a short span of time, these agitated electrons come back to their stable ground state and give up their redundant energy as a small amount of light energy. 12. The colour of the light emitted by these electrons is commensurable to the energy difference between the agitated amount state and the ground state. 13. The CRT screen can be carpeted with different kinds( color and continuity) of phosphor. 14. The light emitted by the phosphor fades veritably fleetly. To maintain the picture on the display, we need to redraw the picture constantly by snappily directing the electron ray back over the same points such a type of display is known as refresh CRT. Que1.9. bandy colorful emissive display bias. OR Write short note on Tube panel ii. TV Answer colorful emissive display bias are 1. In raster plates, the ray is moved each over the screen. 2. overlook conversion is needed. 3. It also displays smooth lines by approaching them with pixels on the raster grid. 4. Cost is low. 5. It has capability to display areas filled with solid colours or patterns. In vector plates, the ray is moved between the end points of the plates primitive. overlook conversion isn’t needed. It draws a nonstop and smooth line. Cost is more. It only draws lines and characters. Tube panel Tube panels, also called gas discharge displays, are constructed by filling the region between two glass plates with a admixture of feasts that generally includes neon. b. A series of perpendicular conducting lists is placed on one glass panel and a set of vertical lists is erected into the other glass panel. Firing voltages applied to a brace of vertical and perpendicular operators beget the gas at the crossroad of the two operators to break down into glowing tube of electrons and ions. Picture description is stored in a refresh buffer, and the firing voltages are applied to refresh the pixel positions( at the corners of the operators) 60 times per second. Interspersing current styles are used to give faster operation of the blasting voltages, and therefore brighter displays. Separation between pixels is handed by the electric field of the operators. ii. Liquid Crystal Displays( LCDs) LCDs arenon-emissive bias which produce a picture by passing polarized light from the surroundings of an internal light source through a liquid demitasse material. Liquid chargers are nearly transparent substances, flaunting the parcels of both solid and liquid matter. Light passing through liquid chargers change their molecular alignment and accordingly the way light passed through them. d. In LCDs, liquid chargers are squeezed between thin concentrated wastes that are used. Liquid demitasse displays are used in atomic boxes and videotape cameras and observers.

Leave a Comment