Computer Graphics: Line Generation Unit 2 Part 1

Que1.10. What are the flat panel displays bias? Answer 1. Flat panel display is a display system that’s designed to reduce the depth of the CRT display caused by the length of the tube. 2. The defenses of these flat panel displays are made up of dyads of electrodes. 3. Each brace of electrodes is used to induce one picture element. 4. There are two types of flat panel displays Emissive displays i. The emissive displays( emitters) are bias that convert electrical energy into light. ii. Tube panels, light emitting diodes are exemplifications of emissive displays. Non-emissive displays Non-emissive displays(non-emitters) use optic goods to convert sun or light from some other source into plates pattern. ii. An illustration of anon-emissive flat panel display is a Liquid Crystal Device( TV). Que1.11. How profitable are flat panel displays? Explain the functioning of TV with suitable plates. Answer Advantages of flat panel displays are 1. It consumes veritably low power. 2. It has veritably thin display which occupies small volume. 3. Cost is low. 4. Used for long continuance. 5. Good trustability and brilliance. Functioning of TV 1. The principle behind the TV is that when an electrical current is applied to the liquid demitasse patch, the patch tends to unlay. 2. This changes the angle of light which is passing through the patch of the polarized glass and also beget a change in the angle of the top polarizing sludge. 3. As a result a little light is allowed to pass the polarized glass through a particular area of the TV. 4. therefore, that particular area will come dark compared to other. 5. The TV works on the principle of blocking light. While constructing the TV, a reflected glass is arranged at the reverse. 6. An electrode aeroplane
is made of Indium Tin Oxide( ITO) which is kept on top and a polarized glass with a polarizing film added on the bottom of the device. 7. The complete region of the TV has to be enclosed by a common electrode and liquid demitasse matter should be above it. 8. When there’s no current, the light passes through the front of the TV that will be reflected by the glass and bounced back. 9. As the electrode is connected to a battery the current from it’ll beget the liquid chargers between the common aeroplane
electrode and the electrode shaped like a cube to unlay. 10. therefore, the light is blocked from passing through and that particular blockish area appears blank. Que1.12. Write graces and faults of TV( Liquid Crystal Display). Answer graces of TV i. It produces veritably bright images due to high peak intensity. ii. It produces lower electric, glamorous and electromagnetic fields than CRTs. iii. It has no geometric deformation at the native resolution. Minor deformation can do for other judgments . iv. It consumes lower electricity than a CRT and produces little heat. faults of TV i. The aspect rate and resolution are fixed. ii. It isn’t good at producing black and veritably dark grays situations. iii. It has lower discrepancy than CRTs due to a poor black- position. iv. Images are satisfactory, but not accurate as colour achromatism is reduced at low intensity situations due to a poor black- position. Que1.13. Explain frame buffer and videotape basics. Also, explain the terms pixel, aspect rate, resolution. AKTU 2013- 14, Marks 07 Answer Frame buffer 1. Frame buffer is a special area of memory in raster displays which is devoted to plates. 2. It holds the set of intensity values for all the screen points. 3. The stored intensity values are recaptured from frame buffer and displayed on the screen one row( scanline) at the time. 4. Each screen point is appertained to as a pixel or pel( docked forms of picture element). 5. Each pixel on the screen can be specified by its row and column number. therefore, by specifying row and column number we can specify the pixel position on the screen. videotape basics 1. videotape or moving image in general, is created from a sequence of small images called frames. 2. By recording and also playing back frames in quick race, an vision of movement is created. 3. videotape can be edited by removing some frames and combining sequences of frames, called clips, together in a timeline. Pixel 1. Pixel is the lowest part of the screen. 2. Each pixel has its own intensity, name or address by which we can control it. Aspect rate 1. An aspect rate is an trait that describes the relationship between the range and height of an image. 2. Aspect rate is expressed by the emblematic memorandum i.e., xy. Resolution 1. Resolution is defined as the number of pixels on the vertical axis and perpendicular axis. 2. The sharpness of the image on the display depends on the resolution and size of the examiner. Que1.14. Write a short note on videotape regulator and display processor. Answer videotape regulator 1. videotape regulator is a crucial tackle element that allows computers to induce graphic information to any videotape display bias, similar as a examiner or projector. 2. They’re also known as plates or videotape appendages that are directly integrated into the computer motherboard. 3. Their main function as an intertwined circuit in a videotape signal creator is to produce TV videotape signals in computers systems. 4. They also offer colorful functions beyond accelerated image picture, similar as television affair and the capability to hook up to several observers. Display processor 1. Display processor( or plates regulator) converts the digital information from the CPU to analog values demanded by the display bias. 2. The purpose of the display processor is to free the CPU from the plates work. 3. In addition to the system memory, a separate display processor memory area is handed. 4. A major task of the display processor is digitizing a picture description given in an operation program into a set of pixel values for storehouse in the frame buffer. Que1.20. Define point and lines. decide the equation for the intercept form of the line. Answer Points and lines 1. A point is a position in a aeroplane
. It has no size i.e. no range, no length and no depth. A point is shown by a fleck. 2. A line is defined as a line of points that extends infinitely in two directions. It has one dimension i.e., length. derivate 1. Line can be represented by two points i.e., both the point will be on the line and lines are also described by the equation. Any point which satisfies the equation is on the line. 2. still, y1) and P2( x2, y2) specify a line and another third If two points P1(x1.point P( x, y) also satisfy the equations also the pitch between points P1P and PP2 will be equal. Que1.27. What are the criteria that should be satisfied by a good line drawing algorithm? Explain. Answer Criteria for good line drawing algorithm 1. Lines should appear straight Lines generated resemblant to thex-axis or y- axis or at 45 ° are colluded rightly with point conniving ways. Line may not pass through other nontransferable points in between. 2. Lines should terminate directly , they may terminate at wrong If lines aren’t colludedaccurately.places. b. This may lead to a small gap between endpoints of one line and the starting point. 3. Line should have constant viscosity To maintain the constant viscosity throughout the line, blotches should be inversely spaced. b. The line viscosity is commensurable to the number of blotches displayed divided by the length of the line. Blotches are inversely spaced only in lines resemblant to thex-axis or y- axis or at 45 ° to the axis 4. Line brilliance independent of pitch and line length This requires a high resolution of the device along with a high refresh rate. 5. Lines should be drawn fleetly In interactive operations, lines should appear fleetly on the screen, that is, minimal calculation is asked to draw the line.

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