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一种改进的遥感图象准无损压缩JPEG―LS算法

DOI: 10.11834/jig.200305189

Keywords: 图象处理(510?4050),遥感图象压缩,准无损,游程编码,JPEG-LS

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Abstract:

为适应遥感图象较高倍率准无损压缩的需要,改进了JPEG-LS算法,该算法首先通过放宽游程检测门限,并通过引入局部梯度控制下的预测来增加平均游程长度,以提高压缩比;然后通过在游程编码区域附加误差修正编码及通过重构图象平滑滤波来改善重构图象的目视效果和提高PSNR值;最后,采用Golomb-RiceCoding技术来对越界误差进行编码,以保持JPEG-LS算法误差界可控的优点.综合利用以上措施,在相同单像素误差界(±7)下,不仅压缩比略有提高,而且重构图象的视觉效果得到明显改善,PSNR提高约1~3dB.

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