DOEACC Society 2006 DOEACC A Level A10.3-R3 Computer Graphics ( ) - Question Paper

F. JPEG
3.7 The process of extracting a portion of a picture G. Filtering
3.8 The technique of splitting a raster-scan trend
into 2 separate trends is
H. Raster Graphics
3.9 System used for representing colors on
computer
I. Interlacing
3.10 An artificial environment created with computer
hardware and software.
J. Clipping
K. Vector Graphics
L. Virtual Reality
M. DPI
N. RGB
A10.3-R3 Page four of five July, 2006
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. Perspective B. Refresh Rate C. Animation
D. Keyboard E. Parallel F. Tweening
G. MPEG H. Mouse I. MIDI
J. Morphing K. Persistance of Vision L. Cohen-Sutherland
M. Beizer N. Mid-Point
4.1 __________ is the process of filling in frames from 1 keyframe to a different so that the
motion appears fluid.
4.2 The physiological phenomenon that enables us to see images in motion (i.e., movies,
TV, video, and animation) is known as ___________.
4.3 It is easier to locate hidden surface when ________ project is used.
4.4 We can use the ____ video standard to describe the format of the video data.
4.5 The _______ Algorithm performs initial tests on a line to determine whether intersection
computations can be avoided.
4.6 A vanishing point is generated with a ______ view.
4.7 ______ curves begin from a control point and end at a control point.
4.8 The number of times image is redrawn on a CRT is known as _______.
4.9 Playing instrumental music in the background of a text document on display is very easy
with _____ files.
4.10 A(n) _____ cannot be used to input the location of a point on the screen.
A10.3-R3 Page five of five July, 2006
PART TWO
(Answer any 4 questions)
5.
a) A line from P1(-1, 1) to P2(9, 3) is clipped to the rectangular window, whose coordinates
are (0, 0), (8, 0), (8, 4) and (0, 4). obtain the visible portion of the line using Cyrus Back
algorithm.
b) How are various shades of colour are generated on the RGB merits.
c) Name the MIDI hardware devices.
(7+4+4)
6.
a) define the hardware devices through which graphical data can be presented to a
computer.
b) provided a rectangle on the screen, define the steps to double the size of the rectangle
subject to condition that the centre of the rectangle does not charge. presume a few
coordinates of the rectangle and show that your procedure is able to carry out the
doubling process. What is the name of the process?
c) describe the following:
i) Presentation
ii) Graphics
iii) Animation.
(5+7+3)
7.
a) What do you understand by the term vanishing points? Which kind of projection, is
associated with vanishing points? define the transformation matrix to yield one
vanishing point in the system.
b) elaborate the main problems considered for the design of multimedia system?
c) Compare the performance of stack based and queue based fill algorithms.
(5+5+5)
8.
a) define 3 base kinds of encoded output frames.
b) Write a routine to design a 2 dimensional Cubic Bezier Curve shapes having 1st order
piecewise continuity by using interactive technique for selection of control points.
c) define Zooming and Panning.
(6+6+3)
9.
a) Briefly define the Phong shading model. Compare its performance with Gouraud
model.
b) Compare and contrast JPEG and MPEG compression techniques and define
importance of compression with reference to web applications
c) Differentiate ranging from
i) Image Format
ii) Graphic Format
iii) File Format.
(6+6+3)
A10.3-R3 Page six of five July, 2006

Earning:   Approval pending.