| 星载遥感图像JPEG2000压缩算法的去量化 |
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| 引用本文： | 杜列波,肖学敏,罗武胜,吕海宝.星载遥感图像JPEG2000压缩算法的去量化[J].光学精密工程,2009,17(3). |
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| 作者姓名： | 杜列波 肖学敏 罗武胜 吕海宝 |
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| 作者单位： | 国防科技大学,机电工程与自动化学院,湖南,长沙,410073 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 随着空间技术的发展,空间遥感图像的数据量呈几何级数增加.为了满足JPEG2000星载遥感图像压缩系统的实时性要求,提出了一种对压缩算法进行优化和改进的方法.分析了离散小波变换后拉伸提升算法和JPEG2000量化算法.然后,通过一个新的拉伸量化因子将量化过程与后拉伸小波变换中的提升过程结合起来,减少了JPEG2000压缩算法的量化操作.最后,介绍了去量化处理方法的定点实现.实验结果表明:应用去量化处理方法可以使JPEG2000压缩算法中拉伸和量化过程所需要的时间降低50%,提升了JPEG2000星载遥感图像压缩系统的实时处理能力.
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| 关 键 词： | 遥感图像 图像压缩 离散小波变换 后拉伸 提升算法 |
Quantification removing for satellite on-board remote image JPEG2000 compression algorithm |
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| DU Lie-bo,XIAO Xue-min,LUO Wu-Sheng,L Hai-bao.Quantification removing for satellite on-board remote image JPEG2000 compression algorithm[J].Optics and Precision Engineering,2009,17(3). |
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| Authors: | DU Lie-bo XIAO Xue-min LUO Wu-Sheng L Hai-bao |
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| Affiliation: | College of Mechatronics Engineering and Automation;National University of Defense Technology;Changsha 410073;China |
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| Abstract: | With the development of space technology, the data of space remote sensing image are expanded greatly. To meet the real-time processing need of satellite on-board JPEG2000 image compression system, the optimization and improvement for the compression algorithm, as well as the design of high speed hardware process system are investigated. The Discrete Wavelet Transform(DWT) algorithm based on post-scaling lifting and quantification algorithm of JPEG2000 are analysed. Then, by a new scaling-quantification fac... |
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| Keywords: | JPEG2000 |
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