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PROGRAM-BCA
(REVISED FALL 2012)
SEMESTER-5
SUBJECT
CODE & NAME-BCA5042– Graphics and Multimedia Systems
CREDIT-4
BK
ID-B1552
MAX.
MARKS-60
Q1.
Briefly explain RGB color model. [10]
Answer.
RGB
color model
The RGB color model is an
additive color model in which red, green, and blue light is added together in
various ways to reproduce a broad array of colors. The name RGB comes from the
initials of the three additive primary colors, red, green, and blue. The main
purpose of the RGB color model is for the sensing, representation, and display
of images in electronic systems, such as televisions and computers, though it
has also been used in
Q2.
Write a note on:
·
Direct view storage tubes
·
Raster Scan Display
(Direct
view storage tubes, Raster Scan Display) [5+5]
Answer.
Direct
view storage tubes
A direct-view storage tube (DVST)
stores the picture information as a charge distribution just behind the
phosphor-coated screen. It is an alternative method for maintaining a screen
image to store the picture information inside the CRT instead of refreshing the
screen. Two electron guns are used in a DVST. One, the primary gun, is used to
store
Q3.
Write a note on:
I.
Control points
II.
Knot Vector
(Control
points, Knot Vector) [10]
Answer.
i)
Control points
The control points determine the
shape of the curve. Typically, each point of the curve is computed by taking a
weighted sum of a number of control points. The weight of each point varies
according to the governing parameter. For a curve of degree d, the weight of
any control point is only nonzero in d+1 intervals of the parameter space. Within
those intervals, the weight changes according to a polynomial function (basis
functions) of degree d. At the boundaries of the intervals, the basis functions
go smoothly to zero, the smoothness being determined by the degree
Q4.
Explain different types of coherence. [10]
Answer.
Types
of coherence
Coherence
is attained when there is a constant phase difference in two or more waves over
time.
Two waves
are said to be in phase if their crests and troughs meet at the same place at
the same time, and the waves are out of phase if the crests of one meet the
troughs of another.
The waves
are incoherent if the crests and troughs meet randomly.
Q5.
What is multimedia? Explain briefly the uses of multimedia. [3+7]
Answer.
Multimedia
Multimedia refers to content that
uses a combination of different content forms. This contrasts with media that
use only rudimentary computer displays such as text-only or traditional forms
of printed or hand-produced material. Multimedia includes a combination of text,
audio, still images, animation, video, or interactivity content forms.
Q6.
Explain the following
(a)
Full animation
(b)
Limited animation
(c)
Rotoscoping
(Full
animation, Limited animation, Rotoscoping) [4+3+3]
Answer.
a)
Full animation
Full animation refers to the process of
producing high-quality traditionally animated films, which regularly use
detailed drawings and possible movement. Fully animated films can be done in a
variety of styles, from more realistically animated works such as those produced
by the Walt Disney studio (Beauty and the Beast, Aladdin,
