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(Please write your Roll No. immediately)

Roll No. ..................................

End-Term Examination

Fourth Semester [B.Tech] - May 2005

Paper Code : ETCS – 201 Subject : Computer Graphics and Multimedia

Time : 3 Hours

Maximum Marks : 75

Note : Attempt any 5 questions in all.

Q1

( a )

Explain the principles of the following input devices in detail:

(i) mouse (ii) tablets (iii) light pen


10

( b )

If a TV screen has 525 scan lines and an aspect ratio of 3:4 and if each pixel contains 8 bits worth of intensity information, how many bits per second are required to show 30 frames each second?

5

Q2

( a )

Obtain the instance transformation matrix required for deriving fig. B from fig. A. Fig A is described by three verities A(2,1), B(4,1), C(3,2) and fig. B is described by vertices A(-4,-2), B(-2,-2), C(-3,-1).

8

( b )

Illustrate various techniques of mapping 3D objects on a 2D graphics screen with the help of suitable figure. Also drive the suitable transformation matrices for the same.

7

Q3

( a )

What are "viewing transformations"? Differentiate between window and viewport transformations.

6

( b )

Explain the working of Z-buffer algorithm.

6

( c )

Wha is image sampling?

3

Q4

( a )

Explain the working of Sutherland Hodgman algorithm for polygon clipping with the help of a suitable example.

6

( b )

Generate a line y=2x + 10 using Bressenham's line generation algorithm.

6

( c )

Explain in brief physical device coordinate system and normalized device coordinate system.

3

Q5

( a )

Find the general form of the matrix for reflection about a line 'L' with slope 'm' and y intercept (0,6).

6

( b )

Describe the working principle of raster refresh display tube. how are different grey levels incorporated in it.

5

( c )

Give and explain the pseudo code for the basic ray tracing algorithm.

4

Q6

( a )

Explain the basic characteristics of light in terms of luminance, hue and saturation. Also develop Phong's model for reflection of light from object surfaces to the user's eye.

6

( b )

Define fractals? how are they classified? Give the methodology for subdividing the objects with Euclidian dimensions.

5

( c )

Compare and contrast the TIFF file formats, with the RIFF formats.

4

Q7

Write short notes on any three of the following:

5 x 3

( a )

Animation techniques

( b )

Color models

( c )

Volume rendering

( d )

Filtering techniques

( e )

Multi-particle systems

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