Title :
Basic characteristics of variable rate video coding in ATM environment
Author :
Nomura, Mitsuru ; Fujii, Tetsurou ; Ohta, Naohisa
Author_Institution :
NTT Lab., Yokosuka, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
Basic characteristics of variable-rate video coders applied to asynchronous transfer mode (ATM) transmission are described. Burstiness of video information is evaluated for conference-type scenes using various coding algorithms. Three measures (distribution, autocorrelation, and coefficient of variation) are introduced to evaluate burstiness. Video sources are modeled and characterized by the autoregressive process and coefficient of variation. Video quality improvement achieved with variable rate transmission is evaluated using signal-to-noise ratio (SNR) and subjective ratings. An improvement of 5-10 dB in temporal SNR and 1 rank in mean opinion score are reported
Keywords :
digital communication systems; encoding; picture processing; statistical analysis; visual communication; AR process modelling; SNR; asynchronous transfer mode; autocorrelation; autoregressive process; coding algorithms; conference-type scenes; distribution; quality improvement; signal/noise ratio; subjective ratings; variable rate transmission; variable rate video coding; video information burstiness evaluation; video signal processing; video source modelling; Asynchronous transfer mode; Autocorrelation; Autoregressive processes; Delay; Layout; Multimedia communication; Protection; Very large scale integration; Video coding; Videoconference;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
