System and method for compressing satellite images with low bit rate

Abstract

The invention discloses a system and a method for compressing satellite images with low bit rate. The system comprises a control module, a wavelet transformation module, a CCSDS scanning coding module and a code stream splicing module. In the system and the method, image data are divided into a plurality of 32X32 (or 64X64 and 128X128) small images; then, the small images are transmitted into the wavelet transformation module, the scanning coding module and the code stream splicing module for obtaining compressing code streams. The wavelet transformation module, the scanning coding module and the code stream splicing module are used for line production among image blocks; and the scanning coding module is used for the line production along bit planes. The compressing effect of the system and the method for compressing the images is between JPEG 2000 and EZW; when the compression is carried out at a low bit rate, the compressing effect is equivalent to JPEG2000; a decoding re-synchronization mechanism is adopted for preventing error codes of space data from diffusing in transmission, with low power consumption; and extensively used parallel operation and a line structure increase the processing speed of a chip and meet the macro compressing requirement of the satellite images.

Description

technical field [0001] The invention relates to the field of image compression, in particular to a low-bit-rate spaceborne image compression system and method suitable for space applications and conforming to the CCSDS standard. Background technique [0002] In recent years, with the rapid development of my country's aerospace technology, the number and accuracy of satellite sensing and detection equipment have increased greatly compared to before, and the amount of image data acquired by satellites during the effective observation period is increasing. "Image data puts enormous pressure on storage and transmission. Since the capacity of the on-board memory is limited by volume, weight, power consumption, etc., it is impossible to increase infinitely, and the transmission capacity of the satellite-ground downlink is limited by the transmission bandwidth and the limited visibility time of the ground station. Orbit image compression has become an essential part of on-board dat...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-bit-rate spaceborne image compression processing system and method to solve the problem of high-magnification compression of images in space applications, and to develop a CCSDS 122.0-B-1 standard, suitable for space applications, FPGA image compression chip with the best area-time-power to solve the bottleneck problem of spatial data storage and transmission

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