april/may 2004

B.E/B.Tech.DEGREE EXAMINATION,APRIL/MAY 2004.

Fourth Semester

Computer Science and Engineering

CS 239- INTERACTIVE COMPUTER GRAPHICS

Time: Three hours Maximum: 100 marks

Answer ALL questions

PART A-(10*2=20 marks)

1. Briefly explain about refreshing CRT.

2. What is frame buffer?What are Bitmap and Fixmap?

3. Explain briefly the advantages of storing color codes in a lookup table.

4. What is need of antialiasing?

5. What is viewing and windowing?

6. Give two examples of wireframe displays an design applications.

7. Explain briefly the two categories of visible-surface detection algorithms.

8. What possible relationships a surface can have with a specified area boundary?

9. State the uses of chromaticity diagram.

10. What is realism rendering?

PART B-(5*16=80 marks)

11. (i) Explain midpoint circle algorithm. Given a circle radius r=10,
demonstrate the midpoint circle algorithm by determining positions
along the circle octant in the first quadrant from x=10 to x=y. (12)

(ii) Write about the following i/o deviceTouch Panels. (4)

12. (a) (i) Define an efficient polygon representation for a cylinder. Justify
your choice of representation. (3)

(ii) Determine the Bezier blending functions for five control points. Plot
each function and label the maximum and minimum values. (13)

Or

(b) Discuss model representations that would be appropriate for several
distinctly different kinds of systems. Also discuss how graphical
representations might be implemented for each systems. (16)

13. (a) The triangle position is A(1,1),B(3,5) and C(2,2), translate the given
triangle with respect to its centroid with A in the centroid position and
rotate it by an angle 30°.after shrinking the object half the size. (16)

Or

(b) Explain in detail about the 3D rotation including all cases. (16)

14. (a) Explain the following visible surface detection methods:

(i) Area-Subdivision algorithm. (8)

(ii) Scan-Line algorithm. (8)

Or

(b) (i) Discuss how wireframe displays might be generated with the
various visible surface detection methods. (4)

(ii) What is ray casting? Explain about Basic Ray-Tracing algorithm. (12)

15. (a) (i) Explain the color models defined with primary colors. (8)

(ii) Explain the color models based on specification of luminance and
purity values. (8)

Or

(b) (i) Explain the techniques for antialiasing in ray tracing. (6)

(ii) Explain any two polygon -rendering methods in detail. (10)

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computer graphics may/june 2007

M.C.A DEGREE EXAMINATION, MAY/JUNE 2007.

Third Semester

MC 1704 — COMPUTER GRAPHICS AND MULTIMEDIA SYSTEMS

(Regulation 2005)

Time : Three hours Maximum: 100 marks

Answer ALL questions.

PART A – (10 x 2 = 20 marks)

1. What do you mean by liquid crystal? Give an example device that uses it.

2. Define region code. State its use.

3. Determine a sequence of basic transformations that are equivalent to the x-direction shearing matrix.

4. Which of the algorithms Cohen – Sutherland algorithm or Liang – Barsky algorithm is more efficient? Why?

5. What is CIE Chromaticity diagram?

6. Name some of the standard motions in key frames of animation.

7. Define image synthesis.

8. Explain the common raster display system architecture with a neat sketch.

9. How is sharing of applications performed in a centralized architecture and replicated architecture?

10. State the problems faced in the event – loop based programs method of virtual reality.

PART B — (5 x 16 = 80 marks)



11. (a) Explain the algorithm for drawing a circle and a ellipse. List out theproperties of both. (16)

Or

(b) Elaborate on the following :

(i) Line Clipping (4)

(ii) Text Clipping (4)

(iii) Raster and random scan displays. (8)

12. (a) Device the B-Spline matrix for the standard cubic, uniform, non – rational B-Spline. Show all of the working. (16)

Or

(b) (i) Device the window-to-view port transformation and Elaborate. (4)

(ii) Discuss the various logical classification of input devices. (12)

13. (a) (i) Distinguish Parallel projection with that of Perspective projection. (6)

(ii) What are the steps involved in the design of animation sequence? Explain. (10)

Or

(b) Discuss the four Polygon Rendering Methods. (16)

14. (a) State the importance of Computer Image Processing. Explain in detail the Image synthesis and Image Analysis. (16)

Or

(b) (i) What are the importance measures that should convey spatial and

temporal content of the scene in visual representation? (8)

(ii) Describe the different techniques used in the animation control

mechanisms. (8)

15. (a) How are the higher layers of the Multimedia Communication System

divided into different architectural subsystems based on communication perspective? Elaborate on the application subsystem. (16)

Or

(b) What is synchronization in multimedia systems? What are thepresentation requirements related to human perception of synchronization between different media? Explain in detail the Lip synchronization and Elementary Media synchronization requirements. (16)