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Abstract

An apparatus for the encoding of a series of wavelet coefficients of a predetermined size into a compact representation of the coefficients. The apparatus comprises a tree builder for constructing a tree form representation of the coefficients with leaf nodes representing coefficient values and internal nodes representing the number of bits needed to encode leaf nodes and child nodes of a current internal node. The tree builder stores the tree form representation in a tree buffer of the apparatus, and the tree buffer stores the tree form representation. A tree coder of the apparatus is interconnected to the tree buffer and adapted to read a current tree form representation and to output the encoding from the tree form representation. The tree buffer can include a component for storing at least two tree form representations and the tree builder can be adapted to form a first of the representations while the tree coder can be adapted to read a second of the tree form representations previously created by the tree builder.

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First Claim