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Abstract

A method of representing a digital image to provide a coded representation is disclosed. The digital image is divided into a number of blocks of pixels and each block is transformed to derive a block of transform coefficients, each transform coefficient being represented by a predefined bit sequence. Each block of transform coefficients is selected in turn as a region and a predetermined maximum bit plane is set as the current bit plane. This is followed by scanning the significances of each bitplane of the selected region from the current bitplane towards a predetermined minimum bitplane, and providing a first token for each insignificant bitplane and a second token for a significant bitplane in the code representation until a significant bitplane is determined and the determined significant bitplane is set as the current bitplane. The selected region is partitioned into two or more subregions having a predetermined form, and setting each of the subregions as the selected region. These steps are repeated for each selected region in turn, commencing from the current bit plane until the predetermined minimum bitplane has been reached, or the selected region has a predetermined size, and coding the transform coefficients of the selected region and providing the coded transform coefficients in the coded representation.

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