采用预测原理的JPEG-LS无损压缩算法存在着固有的误码扩散现象,会影响其在卫星工程中的应用,且基于整幅图像预测的压缩算法还存在较大的处理时延,难以满足遥感图像实时性应用需求.文章对JPEG-LS无损压缩算法进行了改进,提出了采取分块压缩的措施来抑制误码扩散同时降低图像处理时延的方法,并利用风云四号(FY-4)卫星扫描图像对改进的JPEG-LS 无损压缩算法进行了验证.结果表明:改进的JPEG-LS无损压缩算法可在有效抑制误码扩散的条件下,实时无损地将卫星遥感图像数据量压缩至一半左右.可为卫星遥感图像无损压缩技术的改进及工程应用提供参考.%The JPEG-LS image lossless compression algorithm based on the theory of predict has the error-bit propagation effect,which restricts its engineering application,and the delay caused by the total frame image compression will not satisfy the real-time requirement.Therefore the method of the small piece image compression is proposed used to improve JPEG-LS,which is tested using the remote sensing image of FY-4 satellite.The results show that the improved JPEG-LS lossless image compression algorithm can suppress the error-bit propagation as well as real-time and lossless half reduced the data transmitted to the earth.This paper can provide refer-ence on the satellite remote sensing image lossless compression technology improved and engi-neering application.
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