1.
What is the code
sequence for the following two zig-zag ordered 8x8 block (Assume that the first
component in the previous block is 35; You will need the tables I used in the
slides for this, go ahead and refer at them)
40, -8, 0, -4,
60 zeros;
2.
Answer
a.
Is it possible to take
an image coded in JPEG format and extract just the DC components without
reading (and decoding) every single byte in the file?
b.
The baseline sequential
mode JPEG coding is a lossy coding mechanism. Which step of the coding process
introduces the loss?
3.
If it takes 8
calculations to compute a 1-D DCT on an 8-element vector how many calculations
does it take to do a 2-D DCT on an 8x8 matrix?
4.
Answer true or false
a.
When we compute the DCT
of an 8x8 block of pixels the resulting F(0,0) component is called the AC
component.
b.
In DCT, if we do not
drop any frequency components, the inverse transform will give us the original
function with no loss.
c.
Humans are more immune
to loss of low frequency components.
d.
In the successive
approximation technique we send bits of a pixel starting from LSB and working
our way gradually towards the MSB.
e.
Lossless JPEG coding
mechanism is based on DCT
f.
The JPEG Hierarchical
mode can be used on the web to allow browsers to choose the most suitable
resolution based on the browser capabilities.