Image sequence coding at very low bit rates: a review

This paper presents a review of promising techniques for very low bit-rate, below 64 kb/s, image sequence coding. Image sequence coding at such low rates will be a crucial technique in forthcoming visual services, e.g., visual information transmission and storage. A typical application is to transmit moving videophone scenes through the existing analog telephone lines or via a mobile channel. Two types of potential coding techniques are addressed: waveform-based image sequence coding and model-based image sequence coding.