No Subject

So, if it is P frame, then forward search window is 11 by 11. T=22 If it is 1st forward vector used in B frame prediction, then
search window=3 by 3.. T=6 If it is 2nd backward vector used in B frame prediction, then search window=3 by 3.. T=6 If it is 1st
backward vector used in B frame prediction, then search window=7 by 7.. T=14 If it is 2nd forward vector used in B frame prediction,
then search window=7 by 7.. T=14

So, is it OK the way I have set the values of T? also how do we set n and q? I just tried with n=3, q=7, so that we get d=1
(smallest possible perturbation to motion vector)

6) The scheme seems to be general for both P and B frames.. now for B frames, we have both forward and backward motion vectors.. If
both forward and backward vectors satisfy the embedding criteria, then can we embed 2 bits in 1 macroblock, by using both forward
and backward motion vectors for data embedding?

7)in macroblock (MPEG 2 format) motion_type can be frame, field, 16by8 or dual prime.. Nou for motion_type="FIELD", PMV[0][0][0] and
PMV[1][0][0] can be different..So if 2 motion vectors exist for a macroblock, then when we are embedding data, then can both be used
for data embedding..or do we use only one of the two motion vectors??

  Lastly, I wanted to know if anyone has a soft copy of M. Kutter, F. Jordan and T. Ebrahimi, "Proposal of' a watermarking technique
for hidinghetrieving data in compressed and decompressed video", Technical report M2281, ISO/IEC document, JTCI/SC2Y/WGII, (1 997).

 Thanks a lot for your time and patience
  Anindya

ANINDYA SARKAR

PhD STUDENT
ECE DEPARTMENT
UNIVERSITY OF CALIFORNIA, SANTA BARBARA

B.E.(ETCE) JADAVPUR UNIVERSITY
M.E.(SIGNAL PROCESSING)
INDIAN INSTITUTE OF SCIENCE, BANGALORE


		


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