Abstract: Wavclet code algorithm is adopted because compression algorithm is required to largcratio and real-time compress images by missilcborne compression system under the condition of the guarantee of image quality, and DSP (Digital Signal Processor) is selected as the processor of algorithm. Wavelet code algorithm is composed of two step:images are transformed by integer lifting scheme,and the transform results arc coded by SPIHT(Set Partitioning in Hierarchical Trees) algorithm. Wavelet code algorithm is improved to be fit for DSP parallel process for it has some defeclions such as many repeat calculations, and consuming a large number of memories. Experiment results show that the peak signal-to-noise ratio (PSNR) of improved algorithm is larger than 28dB and is as much as original algorithm,which can meet the requirement of image duality; the compression speed is 20 frames per minute, which totally meets real hme compression reqmrement.

Key words: Cruise missile image, Lifting scheme, SPIHT, DSP