Spatially adaptive subsampling of image sequences.
In a spatially adaptive subsampling scheme, the subsampling lattice is adapted to the local spatial frequency content of an image sequence. In this paper, we use rate-distortion theory to show that spatially adaptive subsampling gives a better performance than subsampling with a fixed sampling lattice. A new algorithm that optimally assigns sampling lattices to different parts of the image is presented. The proposed spatially adaptive subsampling method can be applied within a motion-compensated coding scheme as well. Experiments show an increased performance over fixed lattice subsampling.
Belfor
R F
RF
Inf. Theory Group, Delft Univ. of Technol.
Hesp
M A
MA
Lagendijk
R L
RL
Biemond
J
J