motion estimation and compensation for very low bitrate video coding

30 Chapter 1. Digital Video Coding at Very-Low BitRate
(a) (b)
(c) (d)
Figure 1.9: Split and merge procedure on \Foreman": (a) original A,
(b) interesting regions determination D (dark = interesting, light = not
interesting) and (c,d) merged image and associated multigrid E
obtained in the analysis-transcription phase (the luminance and chrominance
means) are rst decorrelated by optimum linear prediction, using
the nearest neighbors. The resulting prediction errors are encoded by
the Universal Variable Length Coder (UVLC [64]).
Reconstruction. Describing tree segmented images as the juxtaposition
of variable size blocks (with one single mean value associated to
every block) leads to large blocking artifacts (cf. gures 1.7, 1.8 and 1.9)