Adaptive method and device for sub-band analysis and synthesis
AssigneeThomson-CSF
InventorsLaurent Perdrieau, Michel Pecot
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Abstract
An adaptive method for television image encoding by splitting the video image to be transmitted into sub-bands at the time of analysis filtering of the image encoder. These sub-bands are split into a tree-like structure by filtering and decimation. Local adaptive filtering is carried out in the analysis filters of each sub-band.
Claims11
An adaptive method using sub-band analysis filters and synthesis filters for image encoders and decoders linked by a transmission channel of the type consisting, at the analysis filters, in splitting up the signal to be transmitted on the transmission channel into sub-bands in a tree structure by filtering and decimation wherein said method consists of the performance, in the analysis filters, of a local adaptive filtering in each sub-band.
An adaptive image encoder and decoder for providing sub-band analysis and synthesis for a transmission channel linkage, comprising:
- a plurality of sub-band analysis filters and synthesis filters associated with said image encoder and decoder;
- wherein said analysis filters include a means for splitting up the signals to be transmitted on the transmission channels into sub-bands in a tree-like structure by filtering and decimation, said means for splitting including a bank of filters having coefficients functionally related to a signal used for optimizing said filters to provide a local adaptive filtering in each sub-band.
Dependencies are inferred from the claim text.