title: Spatially adaptive subsampling of image sequences.
abstract: 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.
authors.affiliation: Inf. Theory Group, Delft Univ. of Technol.
authors.forename: R F
authors.initials: RF
authors.lastname: Belfor
authors.forename: M A
authors.initials: MA
authors.lastname: Hesp
authors.forename: R L
authors.initials: RL
authors.lastname: Lagendijk
authors.forename: J
authors.initials: J
authors.lastname: Biemond