1.
Answer
a.
What is the size of a Macroblock? How many Y, Cr and Cb blocks does it contain?
b.
Give, one approach to
deciding when to encode an I-frame in a video sequence. (I want you to give
your answer based on your understanding)
2.
Answer
a.
What is the purpose of
rate-control in H 261?
b.
What is the idea behind
CBP (the Coded Block Pattern)?
3.
Answer
a.
In hierarchical motion
vector estimation, what information from the lower resolution image is used in
the estimation process with the next higher resolution image?
b.
Of the two logarithmic
search mechanisms for determining the Motion Vector which is better? (Give your
reasoning)
4.
Answer true or false
a.
P-frames take more space
(in terms of bytes) than I-frames.
b.
In H.261, I-frames use
uniform quantization.
c.
In H.261 the reference
frame is always the next I-frame.
d.
The motion vector is
computed for a Macroblock.
e.
H.261 was targeted
towards the home telephone market.
f.
The P in P-frames stands
for “previous”