Flowchart: Alternate Process: DECEMBER 2008Code: DC09                                                                            Subject: COMPUTER GRAPHICS

Time: 3 Hours                                                                                                     Max. Marks: 100

 

NOTE: There are 9 Questions in all.

·      Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.

·      Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.

·      Any required data not explicitly given, may be suitably assumed and stated.

 

 

Q.1       Choose the correct or best alternative in the following:                                         (2x10)

       

a.       Lightpen is a(n)

 

                   (A)  Input device.                                (B)  Output device.

(C)    Memory device.                          (D)  Plotting device.

       

b.      Normal CRT create image of

 

(A)    Three colours                               (B)  Two colours

(C)  Single colour                                (D)  Million colours

            

             c.   To determine the points inside the polygon this test is used

                  

(A)     Inside Test                                  (B) Side by side test

(C)  Over Test                                     (D) Outside test

 

             d.   To increase or reduce the size __________ is used

 

(A)    Rotation                                      (B)  Translation

(C)  Scaling                                        (D)  Reflection      

 

             e.   Cohen-Sutherland algorithm used for

                                                                                               

(A)     Polygon clipping                           (B)  Graph colouring

(C)  Line clipping                                 (D)  3D modeling

 

             f.    Reflection relative to a given axis are equivalent to

                  

(A)      rotation                                (B)   rotation

(C)   rotation                                 (D)  No rotation

 

             g.   A uniform scaling can be done without matrix, just multiply each vector with

 

(A)     Multiplication matrix                     (B) Scale factor

(C)  3D matrix                                     (D) None  


 

             h.   Multimedia kiosks are like ___________

 

(A)    Touch screen                                (B) Keyboard

(C) Mouse                                          (D) Speaker

 

             i.    DVD is a

 

(A)   Sound Device                               (B)  Optical Disk

(C) Video Device                                (D)  None

 

             j.    Sound format more in use now a days is

 

(A)  MIDI                                           (B)   Digital

(C)  Analog                                         (D)   None

 

 

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

 

  Q.2     a.   How Computer Graphics is useful for CAD of Architecture, Mechanical, Aeronautical and Automobile?                                                                (8)

       

             b.   Explain the focusing, deflection hardware and working of CRT.                           (8)

 

  Q.3     a.   Explain the working of acoustical touch panels.                                                   (6)

       

             b.   What is the resolution of an image? Compute the resolution of a  inch image that has  pixels.                                                                                                                         (4)

       

             c.   What do you mean by multimedia? Explain how it is useful in our daily life.                          (6)

 

  Q.4     a.   Write a DDA line algorithm for rasterizing a line in third quadrant.                        (8)

 

             b.   Perform a  rotation of triangle A(0, 0), B(1, 1), C(5, 2), about              P(–2, –2).                   (8)

 

  Q.5     a.   Draw the flowchart for Bresenham’s incremental circle algorithm in first quadrant and also write the pseudocode.                                        (8)

       

             b.   Explain the Bezier-Bernstein approximation method for smoothly joining curve segment.  What are the properties of Bezier-Bernstein approximation?                                                                   (8)

 

  Q.6     a.   Describe Cohen-Sutherland line clipping algorithm.                                             (8)

 

             b.   Explain Scan Line Seed fill algorithm.   (8)

  Q.7     a.   The pyramid defined by the coordinates A(0, 0, 0), B(1, 0, 0), C(0, 1, 0) and D(0, 0, 1) is rotated  about the line L that has the direction              V = J + K and passing through point C(0, 1, 0)  (Fig.1).  Find the               co-ordinates of the rotated figure.                                                                   (8)   

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 


             b.   Explain floating horizon algorithm to remove hidden lines from three dimensional representation of surface function of the form F(x,y,z)=0.            (8)

       

  Q.8     a.   Explain image bitmaps and various image formats.                                               (8)

 

             b.   Describe the various types of light sources modeled in shading algorithms.           (8)

       

  Q.9           Write short note on the following:

 

(i)            WAV file            

(ii)          Zooming and panning

(iii)         Lightpen

(iv)        Composite transformation                                                                    (44)