Abstract   Video  coding  schemes  for  low  bit-rate  is  of  high  imp ortance  and  traditional  coding  schemes  which  use  bl ock  transforms  suffer  from  blocking  artefacts.    Here  we   propose  a  Video  Codec  based  on  Wavelet  transform  a nd  hence  performance  of  the  coder  is  superior  to  other  block   transform  based  codecs.  The  Wavelet  coefficients  a re  coded  using  the  computationally  simpler  no  list  SPIHT  whose  perform ance  is  similar  to  that  of  set  partitioning  in  hierarchical  trees.    Motion  estimation  is  done  using  the  recently  proposed  kite-cross-diamond  search  algorithm  which  is  the  fastes t  among  the  block  matching algorithms.  The codec is ideally suited f or sequences with smooth and gentle motion of the v ideo conferencing kind.   Simulation  results  are  provided  to  evaluate  the  per formance  of  the  codec  at various bit-rates.  The codec is scalable in terms  of  bandwidth  requirement  which  means  only  one  compr essed  bit  stream  is  produced  for  different  bit-rates.    The  use  of  NLS  makes the codec scalable since it has the embedded  coding property.  However for resolution scalability different compressed  files are required.   

References

[1] Koga T., Linuma K., Hirano A., Lijima J., and Ishiguro T., Motion Compensated Inter Frame Coding for Video Conferencing, in Proceedings of Natural Telecommuncation Conference , New Orleans, pp. G5.3.1-G5.3.5, 1981.

[2] Lam W., Po M., and Cheung H., A New Cross- Diamond Search Algorithm for Fast Block Matching Motion Estimation, in Proceedings of IEEE Transaction on Neural Networks and Signal Processing , pp.1262-1265, 2003.

[3] Lam W., Po M., and Cheung H., A Novel Kite Cross Diamond Search for Fast Block Matching Motion Estimation, in Proceedings of the IEEE Wavelet Based Video Encoder Using KCDS 249 Transaction on Circuits and Systems , pp.729- 731, 2004.

[4] Pearlman A., Trends of Tree-Based Set Partitioning Compression Techniques in Still and Moving Image Systems, in Proceedings of Picture Coding Symposium , Korea, pp. 1-8, 2001.

[5] Po M. and Cheung H., A Novel Small-Cross- Diamond Search Algorithm for Fast Video Coding and Video Conferencing Applications, in Proceedings of the IEEE Transaction on Image Processing , USA, pp. I-681, 2002.

[6] Said A. and Pearlman W., A New Fast and Efficient Image Codec Based on Set Partitioning in Hierarchal Trees, in Proceedings of IEEE Transactions on Circuits and Systems for Video Technology , USA, pp. 243-250, 1996.

[7] Shapiro M., Embedded Image Coding Using Zero Trees of Wavelet Coefficients, in Proceedings of IEEE Transactions on Signal Processing , pp. 3445-3462, 1993.

[8] Wheeler W. and Pearlman A., SPIHT Image Compression without Lists, in Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP '2000) , Istanbul, Turkey, pp. 769-772 , 2000.

[9] Radhakrishnan S. and Subramaniam J., Novel Image Compression Using Multiwavelets with SPECK Algorithm, in International Journal of Information Technology, vol. 5, no. 1, pp. 45-51, 2008. Sudhakar Radhakrishnan received the BE in electronics and communication engineering from Madras University in the year 1990, and ME communication systems from Thiagarajar College of Engineering, Madurai, in the year 2001. He has completed his PhD from Anna University. Guruprasad Subbarayan received the BE in electronics and communication engineering from PSG College of Technology in the year 2007. He is currently working in the network infrastructure team of an IT firm. His areas of interest include digital signal processing, digital image processing , and embedded systems. Karthick Vikram received the BE in electronics and communication engineering from PSG College of Technology in the year 2007. He is currently working in an IT projects team in TCS. His areas of interest include digital signal processing and computer networking. 250 The International Arab Journal of Infor mation Technology, Vol. 6, No. 3, July 2009 Wavelet Based Video Encoder Using KCDS 251 The International Arab Journal of Information Technology, Vol. 6, No. 3, July 2009 231