Design And Implementation Of Onboard Satellite Image Compression System For Both Static And Dynamic Images

We mainly research into the design and implementation of onboard satellite imagecompression system for both static and dynamic images in this paper. Imagecompression system in the satellite environment has high demands on processing speed,power consumption and reliability. Meanwhile, in order to achieve a highercompression ratio and better quality of image restoration, a fast SPIHT(set partitioningin hierarchical trees) algorithm based on lifting wavelet transform is used in this systemfor static images. The inter-frame DCT transform is introduced for processing dynamicimages which have strong correlation. All functions are implemented by a XilinxFPGA.This paper will make a detail introduction of a fast SPIHT(set partitioning inhierarchical trees) algorithm based on lifting wavelet transform, and further discuss theimprovement of quality by using inter-frame DCT for frames which have strongcorrelation. On the basis of the core algorithm, we propose the whole system designwith complete description of each child module, and implement the whole hardwaresystem in Xilinx FPGA. The hardware system is able to process two different resolutionimages by judging the mode included in the frame header information, as well ascontrol the transmission of encoded data and project parameters through RS422. Afterthe initial implementation, we further optimize the system for better reliability, imagequality and resource consuming, which finally meet all the requirements of onboardsatellite image compression system.