MCA NALANDA OPEN UNIVERSITY QUESTION (2011) Part-III, Paper-XXV (Computer Graphics and Multimedia)

MCA NALANDA OPEN UNIVERSITY QUESTION (2011) Part-III, Paper-XXV (Computer Graphics and Multimedia)

                                                                                  2011
                                                                             Time: 3 hours
                                                                           Full Marks: 80
                                     Answer any five questions. All questions carry equal marks.

1. What are the number of memory bits required for 8-bit plane frame buffer for a 512 x 512 raster? Also calculate the refresh rate for the same raster (512 x 512), if  pixels are accessed at the rate of 250 nano seconds.

2. Differentiate between Random and Raster Scan display devices. Use DDA line generation algorithm to draw a line from (2,2) to (8,6).

3. Derive a general transformation matrix for 3- D rotation about x-axis. Perform a 45 degree rotation of a triangle A (1,1) , B (5,1) , C (3,5) about an arbitrary point (3,3).

4. Explain any one method of polygon . Representation with the help of an example. How many key frames does a 45 seconds animation film sequence with no duplications require if there are four in between frames for each pair for key frames?

5. What will happen if duplication is allowed? Why file compression Techniques are beneficial in Computer Graphics?

6. Write a procedure to implement the Bresenham line generation algorithm. What are the advantages of this algorithm over the DDA line generation algorithm?

7. Differentiate between the following:
    (i) Graphics and Animation
    (ii) Drawing and Painting
    (iii) Morphing and Panning
    (iv) Motion Specific animation and Motion Generalized animation

8. Explain all the four cases of Sutherland - Hodgman polygon clipping algorithm. Derive the 2-D transformation matrix for reflection about the line  y = mx + c, where m and c are constants, Use this transformation matrix to reflect the triangle A(0,0), B (4,4) about the line  y = 2x + 5.

9. Discuss different file formats used for multimedia applications. Explain the following with suitable diagram:-
    (i) Ambient Refleciton
    (ii) Diffuse Reflection
    (iii) Specular Reflection

10. Explain z- buffer algorithm for visible surface detection. Explain the terms window and viewpoint in the context of clipping. Derive a general transformation matrix for window to viewport mapping.