JPEG2000 coding strategies for hyperspectral data
In using JPEG2000 for the coding of multiple-component, or multiband, images such as hyperspectral imagery, one must consider spectral decorrelation and rate allocation between image components, issues that concern the design of the JPEG2000 encoder and are, consequently, outside the scope of the JPEG2000 standard. Spectral decorrelation via a wavelet transform, as well as three alternative strategies for extending to multiple components the optimal codeblock-bitstream-truncation process widely used for spatial rate allocation in JPEG2000 coding of single-component imagery, are considered. Results indicate that the strategy of simultaneously truncating all code-block bitstreams from all codeblocks from all image components coupled with wavelet-based spectral decorrelation significantly outperforms the other techniques considered in terms of not only rate-distortion performance but also accuracy of unsupervised classification.