Space Solar Telescope Image Of The Wavelet Compression Algorithm And Software Design

The main idea of this paper is to introduce the process of algorithm devising and software developing of wavelet image compression in Space Solar Telescope.Theories about wavelet transform are introduced briefly from the perspective of engineer, then based on these theories, the disposal of some problems that arises during the programming process of two dimensional wavelet transform.After introducing the main idea of EZW(the Embedded Zerotree Wavelet algorithm), the author described "wavelet image compression based on SPIHT (Set Partition InHierarchical Trees)" ---- another "perspective" of EZWexplicitly, some problems that arises during the programming process are also provided here. Experiment results show that pleasurable reconstructed images can be obtained by applying this scheme.In order to get better reconstructed images, arithmetic coding is added to SPIHT scheme. The main idea of arithmetic coding is introduced briefly in this paper, experiment results show that better reconstructed images can be obtained after adding in arithmetic coding.Wavelet packet image compression is one of the focuses in the domain of wavelet image compression, much work has been done by others. In this paper, some main ideas about wavelet packet are introduced, in which the rule named R-D rule which was developed to select the best wavelet packet bases is introduced at length; While applying SPIHT scheme to wavelet packet image compression, the multi-father problem arises, the-n-problem and the disposal of it are then explained; Noticing the difference of the precision that are used to describe the datum in R-D rule and SPIHT scheme, creatively, the author advanced a new method to rectified the R-D rule , the new rule and the programming of it are then provided; Comparing the results with those of past, the method can get even better reconstructed images at high compression ratio, this proves that the rectified R-D rule is reasonable.