Title :
Hierarchical transmission of video signal using multi-code DS/SS modulation based on DCT coefficients
Author :
Honjo, M. ; Makido, S. ; Yamazato, T. ; Okada, H. ; Katayama, M. ; Ogawa, A.
Author_Institution :
Dept. of Inf. Electron., Nagoya Univ., Japan
Abstract :
We propose a hierarchical transmission of video signal using multi-code DS/SS modulation. Assigning an appropriate distribution of transmission energy to DCT coefficients, it is possible to control the picture quality depending on the channel quality. We consider a hierarchical structure based on the variance of DCT coefficient and transmit each coefficient using multi-code DS/SS modulation. The analysis is carried out to show the effectiveness of our scheme using 2-D Gauss-Markov random field, which represents image data. It is shown that by an appropriate energy assignment to each stratum (a branch of multi-code DS/SS), it is possible to maintain picture quality even in bad channel quality
Keywords :
Gaussian processes; Markov processes; data compression; discrete cosine transforms; image representation; modulation; spread spectrum communication; transform coding; video coding; visual communication; 2D Gauss-Markov random field; DCT coefficient variance; DCT coefficients; channel quality; energy assignment; hierarchical structure; hierarchical transmission; hierarchical video signal transmission; image data representation; multi-code DS/SS modulation; picture quality control; transmission energy distribution; wireless channel; Bit rate; Decoding; Degradation; Digital video broadcasting; Discrete cosine transforms; Gaussian processes; Image analysis; Image reconstruction; Satellite broadcasting; Working environment noise;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.966315
