West Bengal Institute of Technology (WBIT) 2009-6th Sem B.Tech Computer Science and Engineering Computer Science - Computer Graphics & Multimedia - Question Paper
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C8/B.TECH (C8E)/8EM-0/C8-603/09 3
ENGINEERING MANAGEMENT EXAMINATIONS, JUNE - 2009
COMPUTER GRAPHICS AND MULTIMEDIA
Time : 3 Hours] I Full Marks : 70
GROUP - A (Multiple Choice Type Questions)
1. Choose the correct alternatives for any ten of the following : 10x1 = 10
1) The best hidden surface removal method(s) used for complex scenes with more than a few thousand surfaces is/are
a) Depth sorting method b) Scan line algorithm
e) Depth buffer algorithm d) Octree method. |
fl) When the angle between the projectors and the plane of projection is not equal to 90 then the projection is
a) Orthographic b) Isometric
c) Perspective d) Oblique. [
ill) Under a parallel projection the point ( 2, 3, - 1 ) has been viewed at ( 3, 3, 0 ).
- then the direction of the vector should be
a) (1. 1, 0) b) ( 1,0,-1)
c) (0,1,1) d) (0,-1, 1). | ~
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iv) - The reflection matrix of a point P{x, y) about the straight line y = - x is * | ||||||||||||||||||||||||||||
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v) The DDA algorithm is a faster method for calculating pixel positions than direct use of line equation using y = mx + c, because
a) it eliminates floating point addition
b) it eliminates floating point multiplication
c) it eliminates rounding operation that drift away from true line path
d) none of these. _
vi) In Bresenhams circle algorithm, if points are generated from 90 to 45 and (x, y ) are the coordinate of last scan converted pixel then the next pixel
coordinate is
a) ( x + 1, y + 1 ) or ( x- 1, y - 1 )
b) ( x+ 1,y) or {x. y + 1)
c) ( x, y + 1) or ( x + 1, y - 1)
d) (x + 1, y ) or (x + 1, y - 1 ). -
viO Aliasing means
a) Rendering effect . b) Shading effect
c) Staircase effect dl. Cueng effect. _
viii) Sutherland-Hodgeman algorithm is used for
a) line dipping b) point cUpplng
c) polygon dipping d) hybrid clipping. _
fad TTie technique of using a minimum number of intensity levels to obtain increased visual resolution Is . .
a) Dithering ' b) Halftoning
c) Depth-Cueing d) Rendering. 1
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. 1 . "y 1 11 * ... .
x) Z-buffer algorithm is used fen
a) frame buffer removal b) hidden line removal
c) rendering d) animation. _____
xi) The format for storing digital audio in multimediaapplications is
a) JPEG b) TIFF
c) WAV d) BMP. I
xii) The people erf the planet Mars designed a Kale for measuring the temperature in which water freezes at 100 units and boils at 250 units. The people of Jupiter designed a scale in which water freezes at 75 units and boils at 300 units. A temperature of 200 units in Mars will measure .................. units in Jupiter.
a) 300 b) 225
c) 250 d) 175. I
xiii) The Model Human Processor is comprised of three components, which are
a) Cognitive system, perceptual system, and affective system
b) Cognitive system, proprioceptive system and affective system
c) Perceptual system, motor system and cognitive system
d) Perceptual system, locomotion system and cognitive system. 1
xiv) A raster colour display processor supports a resolution of 1024 x 800 with up to 16 million colours simultaneously display able. What will be the approximate size | in bytes) of the frame buffer used in the display processor ?
a) l-2xl06 b) 2*4 x 106
c) 16x10 d) 10. 1 "
xv) A Bezier cubic curve with control points P0 , P l , P2 and P3 is defined by the equation
- 3 .
/(u) = X P,B?<).
' t = 0 x
b) u3
, -. . d) 3u2 ( 1 - u).
a) (l - u)3 c) 3u(l-u)2
GROUP-B ( Short Answer Type Questions)
Answer any three of the following questions.
3x5* 15
Explain antialiasing A cubic Bezier Curve Segment is described by the control points PI f 20, 20 ), P2 ( 40, '80"). P3 ( 80, 80 ), P4 ( 90, 50 ). Another curve segment is described by 1 ( a, b), Q2{ c, 20), 03 ( 150, 20 ), 04 ( 180, 20 ). Determine the values a b, c so that the two curve segments join smoothly . 2 + 3
Perform a 30 rotation of a triangle A ( 2, 2), B { 3, 3 ), C ( 6, 5 ) about
0 the origin
b) a point P (- 8, - 5 ). 2 + 3
Define projection and mention its importance. Derive the transformation matrix for a perspective projection.
Write the steps of the Z-buffer algorithm. Discuss its advantages and disadvantages.
What, do you mean by staircase effect ? How does this staircase effect affect the gteneration of graphic primitives ? What was the proposed solution to this effect ?
7. Distinguish between window and viewport. Describe how window to viewport mapping Is done.
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CS/B.TECH [CSE)/8EM-6/C8-603/09 . '
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GROUP -C
( Long Answer Type Questions )
Answer any three of the following questions, 3 x 15 = 45
8. a) b)
Why are homogeneous coordinates used for transformation computations in Computer Graphics ?
Show how reflections in the line y = * and in the line y = - x can be performed by a scaling operation followed by a rotation.
c) Describe , how a 3D object is presented on the screen using perspective projection. Take a simple object for illustration.
d) An object ABCD rectangle" is defined with respect to a coordinate system whose units are measured in inches. If a local coordinate system which uses mm as the basic unit is used to describe the object details abed rectangle" as shown in the figure below, then indicate the necessary transformation matrix for describing the object in the local coordinate system :
2 + 4 + 4 + 5
9. a) Differentiate between Flood Fill & Boundaiy Fill algorithms.
b) A Bezier curve is to be drawn by the given control points as PI ( 40, 40 P2 ( 10, 40 ), P3 { 60. 60 ) & P4 ( 60, 0 ). Calculate the coordinates of the points on the curve corresponding to the parameter t - 0-2, 0-4, 0-6. Show the rough sketch of the curve with the coordinates of various points on it.
c) Using mid-point circle drawing algorithm, draw a circle with radius of 8 units.
10. a) What are meant by Key framing and Tweening ?
b) What are Hypertext and Hypermedia ?
c) What is the difference between the followiing ?
D Video and Motion picture
11) Video and animation.
d) What are meant by luminance and chrominance ? Discuss about their quantitative expressions. 3 + 2 + 5 + 5
11. a) Write the mid-point ellipse drawing algorithm (only the algorithm).
b) Derive the mid-point circle drawing algorithm.
c) Using mid-point circle drawing algorithm, draw a circle with radius 10 units
6 + 6 + 3
12. a) What do you mean by B-Spline curve ? Discuss the propertied of B-Spline
curves.
, b) Write down the basic steps of MPEG video compression.
c) What are the major components of a multimedia document ? How can they be compiled together ? ( 2 + 4 ) + 6 + 3
13. Write short notes on any three of the following : 3x5 0 Virtual Reality
b) Sampling & Quantization
c) MPEG & JPEG
d) Sutherland-Hodgeman Potygon Clipping Algorithm
e) Phongs Shading Model
f) Cubic B-Spllne.
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| Earning: Approval pending. |
