computer graphics and multimedia 204

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00313Student Number 1 < -- _

Sri Lanka Institute of Information TechnologyB.Sc. Special Honours Degree

In ~

Information TechnologyFinal Examination

Year 2, Semester 2 (2010)Computer Graphics and Multimedia (204)

Duration: 3 HourWednesday, 20th October 2010(Time 1.00 p.m. - 4.00 p.m.)

Instruction to Candidates: This paper has 5 questions. Answer All Questions. Please provide answers in the Question Paper itself within thecages provided. Total Marks 100. This paper contains 22 pages with the Cover Pager. There are extra blank sheets attached to the end of the paper.


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Question 1 - Fundamentals of Computer Graphics(20 Marks)

a) Explain what computer Graphics is in your own words and list two areas thatuse computer graphics.

(3 marks)

b) Compare two types of computer graphics based on its content, disk space,suitable situations, supporting software design tools.

(4 marks)

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c) "Some images loose its quality when scaling and zooming."i) Identify the above problem and name the type of image subjected to the

above problem.(2 marks)

ii) Propose the solutions for the above problem.(2 marks)

d) Consider a raster system with resolution of 640 by 480. How many pixelscould be accessed per second in this system by a display controller thatrefreshes the screen at a rate of 60 frames per second?

(4 marks)

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e)i) Describe the difference between Computer Graphics and ImageProcessing?

(2 marks)

i i ) "Pixel act as a Transducer on the CRT screen"Justify the above statement.(Hint: A transducer is a device that converts one type of energy to another.)

(3 marks)

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Question 2 - Computer Graphics Hardware(20 Marks)

a) Demonstrate how does the deflection of electron beam take place inside the CRT(Cathode Ray Tube)

(4 marks)

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b) Name the component in CRT, which is responsible for avoiding stray electrons.Explain how it happens using a diagram.

(2 marks)

c) The dot pitch of a monitor is 0.28 mm. Assume normally the viewer is 60 cmaway from the monitor when he/she views the monitor. What would be the dotpitch that is needed, for a viewer to view in the same manner at distance of 200m?

(6 marks)

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d) Describe how the polarization of light rays happens inside LCD monitor with adiagram.

(4 marks)

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e) Compare and Contrast the display technologies used by televisions and penplotters with aid of diagrams.

(4 marks)

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Question 3 - Geometric Transformations, Computer Animation(20 Marks)

a) Briefly explain the basic geometric transformations using suitable diagrams.(3 marks)

Contd ...

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b) Think about the cartoon animation you have created for the 'Moho' assignment.Briefly explain the steps you have followed in order to complete the animation.(8 marks)

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c) Differentiate 'Traditional animation' and 'Computer animation'.(3 marks)

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d) Discuss the following animation principals with suitable examples.a. Arcsb. Anticipationc. Timing (3 marks)

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e) Apply Translation for th e followin g objec t.y

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Tra nslation vecto r Txand Ty as fo llows.

0.0 I 2 3 4 5 6 7 8 (3 M arks)

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Question 4 - Colour in Computer Graphics, Image File Formats, 3DComputer Graphics, Rendering(20 Marks)

a) How do you perceive colours in computer graphics? Explain brietly.(3 marks)

h) "A CRT monitor displays colour pictures by using a combination of phosphors thatemit different-coloured light. "i) List two basic techniques for producing colour display in CRT monitors?

(2 marks)

ii) One of the above mentioned techniques is the most suitable for 'Random ScanMonitors'. Describe the technique briefly.

(2 Marks)

Contd ...

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c) Compare and contrast Additive (RGB) colour model and Subtractive (CMYK)colour model.(4 marks)

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d) "The JPEG (Joint Photographic Experts Group) image file format is more popularin web graphics than BMP (Bitmap) file format."Justify the above statement. (4 marks)

e)i) W hat is prim itive m odeling in 3D computer graphic s?

(2 marks)

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ii) Which shading method is having the visible facets problem? What are the solutions forthis problem? Briefly explain.

(3 Marks)

Question 5 - Projections, 2D and 3D viewing, Streaming Video and VirtualReality(20 Marks)a) Compare and contrast Perspective and Parallel projection with suitable diagrams.(5 marks)

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b) What is meant by 'Window' and 'View port'?(2 marks)

c) "Streaming video is a method of using streaming servers to transmit digitalvideo over the internet. "i) What are the two types of streaming?

(2 marks)

ii) Explain each type briefly.(4 marks)

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iii) Differentiate the 'Download and play' method from above methods?(2 marks)

d) What does the term' Virtual Reality' means? Explain in your own words.(2 marks)

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e) Explain how a typical VR (Virtu al Reali ty) application works.(3 marks)

The End of Question Paper

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computer graphics and multimedia 204

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