Multiscale coding of images
AssigneeMassachusetts Institute of Technology
InventorsAndrew B. Lippman, William J. Butera
Life of this patent
Estimating the term…
Abstract
Image encoding apparatus and methods include recursively decomposing the luminance values of sequential frames into spatio-temporal spectral components, by quadrature mirror filter (QMF) processing of the luminance values. The filtered signals are subsampled, and each decomposed level of the spectral components is coded by vector quantization.
Claims20
A method of encoding an image, the image including a plurality of frames defined by a set of chrominance and luminance values, the method comprising the steps of
- recursively decomposing, to at least two levels of recursion, the luminance values of sequential frames into spatio-temporal spectral components, said spatio-temporal spectral components including a plurality of spatial components and a plurality of temporal components,
- said decomposing step including the steps of
- quadrature mirror filtering signals representative of said luminance values and
- subsampling said filtered signals, and
- coding each recursively decomposed level of at least one of said spectral components by vector quantization.
Apparatus for encoding an image, the image including a plurality of frames defined by a set of chrominance and luminance values, the apparatus comprising
- decomposing means for recursively decomposing, to at least two levels of recursion, the luminance values of sequential frames into spatio-temporal spectral components, said spatio-temporal spectral components including a plurality of spatial components and a plurality of temporal components,
- said decomposing means including
- quadrature mirror filter means for filtering signals representative of said luminance values and
- subsampling means for subsampling said filtered signals, and
- vector quantization means for coding each recursively decomposed level of at least one of said spectral components by vector quantization.
Dependencies are inferred from the claim text.