DOEACC Society 2007 DOEACC A Level A10.3-R3 Computer Graphics - Question Paper

3.7 Is the process of removing lines or portions of lines
outside of an area of interest
G. CMY
3.8 Changing the frames with respect to time H. Tweening
3.9 A special spline curve I. Virtual Reality
3.10 A commonly used standard method of
compressing photographic images
J. DPI
K. Animation
L. Line Clipping
M. B-Spline
N. JPEG
A10.3-R3 Page three of five January, 2007
4. every statement beneath has a blank space to fit 1 of the word(s) or phrase(s) in
the list beneath. Enter your option in the “tear-off” ans sheet attached to the
ques. paper, subsequent instructions therein. (1 x 10)
A. Parallel B. Perspective C. Stroke method
D. Translation E. Boundary fill F. Morphing
G. Rotation H. Dataglove I. More
J. MPEG K. Scaling L. Image processing
M. Scan-line method N. Flood fill O. JPEG
P. Scan Conversion Q. Less R. Raster Scan
4.1 ________ creates characters out of a series of line segments.
4.2 In ________ projection image points are obtained as the intersection of view plane with a
projector drawn from the object and having fixed directions.
4.3 ________ is a device to interact with animated artificial objects.
4.4 ________ is the process of converting the rasterized picture stored in a frame buffer to
the rigid display trend of video.
4.5 Dragging in computer graphics can be achieved through ________.
4.6 MIDI files occupy ________ space than .WAV files.
4.7 The ________ algorithm is useful when the region is to be filled has no uniformly colored
boundary.
4.8 ________ is used to photo realistic images containing many colours.
4.9 A technique for creating a smooth transition ranging from 2 images is called ________.
4.10 Zooming operation on the screen can be carried using the ________ transformations.
A10.3-R3 Page four of five January, 2007
PART TWO
(Answer any 4 questions)
5.
a) define the Bresenham’s algorithm to draw a circle whose centre is origin and
radius is 7.
b) discuss briefly the subsequent file formats:
i) JPEG
ii) MPEG
(7+8)
6.
a) What is the need of backface removal technique? How does Floating Horizon algorithm
determine which surface is hidden?
b) i) If 1 Bezier curve P(t) of degree n is described by vertices Bi and an adjacent
Bezier curve Q(s) of degree m by vertices Ci, state the 1st and 2nd –
derivative continuity conditions at the joint ranging from the curves.
ii) For a Bezier curve, P(u), of degree 5, suppose the control points are B1(0, 0),
B2(2, 2), …, B5(5, -1) and B6(7, 0). obtain the remaining control points of the curve
which has its 2nd derivative at u=0 and u=1 equal to zero.
(9+6)
7.
a) Consider the subsequent figure and obtain transformation matrix to reflect the triangle ABC
with respect to the line PQ. {A=(1, 1), B=(4, 1), C=(3, 3) and the line PQ intercept y-axis
at (0, 2)}.
b) Why is Mid-point sub-division algorithm preferred over Cohen-Sutherland algorithm for
the clipping? Write Mid-point sub-division algorithm for line clipping.
(7+8)
8.
a) Consider a window having vertices A(1, 1), B(5, 3), C(4, 5) and D(0, 2). obtain the
normalization matrix N that maps this window onto normalized device co-ordinate
system (NDCS) whose co-ordinates are (0, 0) and (1, 1), respectively.
b) What is Hypermedia?
c) elaborate the advantages and disadvantages of MIDI over digital audio?
(6+4+5)
9.
a) discuss the mechanism and working principle of a mouse.
b) define the shadow mask technique for the origin of colors in a CRT. elaborate its
limitations?
c) How does a Rubber band technique help in graphics?
(6+6+3)
A10.3-R3 Page five of five January, 2007
x
(0,2)
O
A(1,1) B(4,1
C(3,
Q
P
Y

Earning:   Approval pending.