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structure but reduced for the images Jasper Ridge and Moffett Field. Thus, our
recommendation is to use 16 sub-bands in the group.
4 Conclusions
The modification of the DCT-based method for the lossy compression of the
hyperspectral AVIRIS data is proposed. Due to the proposed blind estimation
of the additive noise standard deviation and the image normalization with sub-
band grouping, the compression ratio (CR) has increased by 6 . . . 50% with
respect to the method designed earlier. The grouping of the bands remains image-
dependent: images with simple structures allow a higher number of bands in a
group. If there are more complex structures then the compression ratio may
reduce. Thus, the recommendation is to use a quasi-optimal number, namely 16,
of the bands in a group to remain in the safe side with respect to the compression.
The filtering effect is observed for sub-bands with low SNR whilst no visual
distortions take place for sub-bands with large SNR.
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