中国空间科学技术

中国空间科学技术

• •    

遥感图像受控有失真压缩技术研究

曾湧,严荣华   

  1. 中国资源卫星应用中心,国家基础地理信息中心 北京100830 ,北京100044
  • 发布日期:2005-02-25

Research of Remote Image Lossly Compression in Control

Zeng Yong (China Center for Resources Satellite Data and Applications, Beijing 100830) Yan Ronghua (National Geomatics Center of China, Beijing 100044)   

  • Online:2005-02-25

被引次数

4

摘要： 在测绘遥感领域, 对图像的像质要求较为严格, 但即便如此, 遥感图像数据中仍然含有噪声, 从而有损压缩是可行的。文章在遥感图像信噪分析的基础上, 提出了一种遥感图像受控有失真压缩技术。首先分析了遥感图像有失真压缩的可行性; 然后应用小波的良好变焦性能, 对遥感图像施行2层2维小波的塔式分解; 对低频子图进行精细量化,对高频子图进行从粗到精的量化; 最后, 考察不同的高频量化器对遥感图像的压缩倍率和恢复图像像质的影响。

关键词: 信噪比, 压缩, 量化, 遥感图像处理, 航天遥感

Abstract: In the domain of surveying and mapping , users present rigorous requirements for the image quality. But there are noises in the image data, so lossy compression is feasible. In this paper, a method of remote image lossy compression in control is presented. First, the feasibility of remote image lossy compression is analysed. Then the method of two layer and two dimension wavelet transform to decompose original image is adopted, and 7 high frequency quantizers according to remote image's feature is created. At last, the relation between the compresion ratio and peak peak SNR at the different high frequency quantizers is stakied.