Document Type
Thesis
Date of Award
5-31-1989
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Ali N. Akansu
Second Advisor
Chung H. Lu
Third Advisor
Nirwan Ansari
Abstract
An efficient scheme for video sequence coding is presented here. The interframe redundancy present in the video sequence is exploited by motion compensation using the efficient independent orthogonal search technique, which requires least number of computations in the worst case. The motion compensated frame difference signal is encoded with a new technique — subband adaptive vector quantization.
Subband coding like transform coding results in signals of unequal energy patterns, which is efficiently utilized for bit allocation. In addition, the subband approach offers means for efficient (but suboptimal) Vector Quantization (VQ) by splitting the signal into several signals. By rate distortion theory, vector quantization performs better than the scalar quantization. As subband signals are uncorrelated, the loss in performance due to independently quantizing each band is small.
The subbands are vector quantized adaptively. Subbands are divided into 4x4 subblocks, grouped according to their variances and are quantized using tailor made codebooks. By this different featured signal sources will employ different codebooks. An average SNRpp = 37.82 dB, is obtained for highly active monochrome video sequence 'CINDY' with an average bit rate of 0.36 bits/pixel. The subjective tests also show that the picture quality is good at that bit rate. Additional bit rate is obtained if the motion information is entropy encoded.
Recommended Citation
Kadur, Manjunatha S., "Adaptive subband video coding with motion compensation" (1989). Theses. 2797.
https://digitalcommons.njit.edu/theses/2797
