Rajiv Gandhi Proudyogiki Vishwavidyalaya 2010-5th Sem B.E Computer Science and Engineering .(ester) ,., COMPUTER GRAPHICS AND MULTIMEDIA - Question Paper

B.E.(Fifth Semester) EXAMINATION, Dec., 2010

(Computer Science & Engg. Branch)

COMPUTER GRAPHICS AND MULTIMEDIA

 

Unit-1

 

1.   (a) Describe the working of raster refresh display tube. How different grey levels are incorporated in it ?

 

(b) What are the drawbacks of DDA line drawing algorithm ? How are they removed or minimized in Bresenhams algorithm ?

 

Or

 

2.   (a) Differentiate between interlaced and non-interlaced monitors. What is the fraction of the total refresh time per frame spent in retrace of electron beam for a non-interlaced raster system with resolution of 1280*1024, a refresh rate of 60 Hz, a horizontal retrace time of 5 microseconds and a vertical retrace time of 500 microseconds ?

 

(b) Discuss how the use of homogeneous co-ordinates permits us to use efficient computing of geometrical transformations in computer graphics.

 

Unit-2

 

3.   (a) Describe the composite transformation of two successive translations for three dimensional objects.

(b) Determine a sequence of basic transformations that are equivalent to th x- direction shearing matrix.

 

Or

 

4.   (a) Find the transformation required to reflect a polygon whose vertices are A(-1,0), B(0,-2), c(1,0), and D(0,2) about the line y=x+2. Find reflected image.

(b) What is scan-conversion ? Mention some side-effect of scan-conversion.

 

Unit-3

 

5.   (a) Write down the transformation matrix for shearing z-axis parallel projection method.

(b) Device the B-spline matrix for the standard cubic,uniform, non-rational B-spline. Show all of the working.

 

Or

 

6.   (a) rotate a triangle A(0,0), B(2,2), C(4,2) about the origin and about p(-2,-2) as by an angle of 45.

(b) Find the normalization transformation for mapping a window having (2,2) as the lower left corner and (4,6) as the upper right corner onto:

[1] A view port that is entire normalized device screen

[2] a view port having (0,0) as lower left corner and (1/2,1/2) as the upper right corner.

 

Unit-4

7.   (a) Name carious color models and explain each of them.

(b) Explain the following line-clipping alorithms:

[1] Cohen-Sutherland algorithm

[2] Mid-point subdivision algorithm

 

Or

 

8.   (a) Which of the algorithm Cohen-Sutherland algorithm or Liang-Barsky algorithm is more efficient ? Why ?

(b) Describe the Phongs specular reflection model with Fresnels law of reflection.

 

Unit-5

 

9.   (a) What is basic concept of Hypertext ? Why are hypertext used for information representation in multimedia package ? Name the tools used to implement it.

(b) What are the evolving technologies of multimedia ?

 

Or

 

10.                     (a) What is the key limitation of relational database in implementing multimedia applications ?

(b) Give the compression technique used in Facsimile and Document Images.