| 摘要 |
<p>The present invention relates to a method and apparatus for hierarchically representing data P (31). The data P (31) comprises an MxN array of datapoints, where M and N each are an integer greater than one. The data P (31) are sub-band coded to provide a plurality of coefficient sets (41, 51, ..., 81) where each coefficient set (41, 51, ..., 81) has a different scale (σ = 1, 2, ..., 5). The coefficient sets C (41, 51, ..., 81) are then interscale coded at least once to obtain a set of coefficient vectors and residual vectors R to represent the image data P (31). Preferably, the interscale coding involves primary interscale coding the plurality of coefficient sets C (41, 51, ..., 81) and secondary interscale coding the primary interscale coded plurality of coefficient sets (41, 51, ..., 81). Preferably, the sub-band coding involves base image coding that is applied at least twice. The base image coding can be selected from the group consisting of a Haar transform, a Fourier transform, and a Sample-Difference transform, for example. The set of coefficient vectors and the residual vectors are then quantised and encoded using run-length encoding and entropy encoding.</p> |
