B4.4-R3: COMPUTER GRAPHICS AND MULTIMEDIA SYSTEMS
: JANUARY 2006
NOTE:
1. Answer question 1 and any FOUR questions from 2 to 7.
2. Parts of the same question should be answered together and in the same sequence.
Time: 3 Hours Total Marks: 100
1.a) Discuss the merits and demerits of various clipping algorithms.
b) How does the Z buffer algorithm determines which surfaces are hidden?
c) Explain the Sutherland Cohen line-clipping algorithm. Is this applicable to any type of window? Justify your answer.
d) Explain how MIDI files are created and what are their applications in multimedia applications.
e) Describe briefly the Phong shading and compare it with Gouraud shading.
f) Explain the importance of vanishing point. What type of projection is associated with it? Explain the projection.
g) Describe the importance of compression in multimedia system. Compare and contrast JPEG and MPEG techniques.
(7x4)
2. a) Differentiate between video compression standards and multimedia video compression standards.
b) What are the components of multimedia systems? Explain in brief each component.
c) Describe the functions of flat panel displays.
(4+10+4)
3. a) Show the n th degree B-spline basis function B i,n (x) = 0 , if x < t 1 or x > t i+n-i.
b) A triangle having vertices at (0,0), (1,1) and (5,2) is rotated by 45 degree clockwise i) about origin and ii) about P(-1, -1) point. Obtain the coordinates of the vertices of the triangle using homogenous coordinate system.
c) What are the advantages of parametric representation of curves and surfaces in computer graphics?
(6+10+2)
4. a) Describe different models used for illumination. How do you define surface normal vector? Explain its importance.
b) Explain ray tracing and compare it with ray casting. Describe the intersection of an arbitrary ray with yz plane.
c) Explain rendering. What are the approaches used for volume rendering? What are the steps used in the process of smooth shading?
(6+6+6)
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5. a) Explain why RGB color model is used for display. How different shades of colors are generated on the RGB monitors.
b) How is clipping done in three-dimensional domain? Discuss the various options for selecting different types of view volumes.
c) Describe Painter’s algorithm. Give its relative advantages and disadvantages over other methods.
(6+6+6)
6. a) In a 3D coordinate system the plane XY(z = 0) represents the screen of monitor. A box is placed at the origin such that its three edges are touching x, y and z axes. Describe the transformation matrix needed to show the side view of the box on the screen.
b) What did you understand by morphing? Explain with the help of practical application.
c) Write a routing to design a two dimensional cubic Bezier curve shapes having first order continuity. Use interactive technique for selecting control points in XY plane for each section of curve.
(6+6+6)
7. a) Explain where and why the magnetic storage is used in multimedia system?
b) Describe the operation of scanner. What criteria would you use for selecting scanner?
c) What are the main design issues for the multimedia authoring system? Briefly explain each one of these issues.
(4+4+10)
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