| 摘要 |
A method for data reduction of digital image sequences in heirarchic fashion by means of a multi-stage coder on the basis of vector quantizing and movement compensation, as well as reconstruction of these image sequences by means of a multi-stage decoder. An input image signal is represented in a plurality of image signals having different spatial resolutions by means of a cascade of L identical low-pass filters having subsequent sub-scanning, whereby the spatial resolution and the data volume of the input image signal in the horizontal and the vertical directions are respectively reduced by a factor R in every cascade stage, and whereby the input signal is referenced "resolution level L" and the low-pass filter image signal having the smallest resolution is referenced "resolution level O". The chronologically preceding, reconstructed, movement-compensated image signal is represented in a plurality of image signals having different topical resolution in the same way. The samples of the resolution levels are subdivided into blocks, whereby the "resolution level O" has the block size "1x1" and, for the next, the block size is horizontally and vertically increased by the factor R with every further resolution level but a block assumes the maximum block size NxN.
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