一种基于小波变换的遥感图像压缩算法  

An Image Compression Algorithm for Remote Sensing Image Based on Wavelet Transform

作　　者：王明富[1,2] 杨世洪[1] 吴钦章[1] 

机构地区：[1]中国科学院光电技术研究所,成都610209 [2]中国科学院研究生院,北京100039

出　　处：《光电工程》2009年第11期85-91,共7页Opto-Electronic Engineering

摘　　要：为验证图像压缩算法122.0-B-0对遥感图像的有效性,在对该算法进行了较为详细的研究后,对该算法进行了软件实现,然后将该算法与JPEG2000、SPIHT算法在压缩效率及压缩速度上进行了比较。实验结果表明:该算法在较低码率下压缩性能与JPEG2000、SPIHT算法相当,在较高码率下压缩性能略微下降,但在相同码率下它的编码速度比JPEG2000快2倍左右,比SPIHT算法约快1.5倍左右,且编解码速度与码率成正比。该算法采用的编码方式相对简单,无反馈操作,可适应于不同内存大小的压缩系统,并采用分段编码有效地防止误码扩散,因此在空间飞行器上具有巨大的应用价值。To verify the validity of image compression algorithm, 122.0-B-0, we implemented it with software after a detailed research, and then compared it with two other classical image compression algorithms： JPEG2000 and SPIHT. The experimental results show that CCSDS algorithm has an equivalent performance to JPEG2000 and SPIHT when compressing in a low bit rate, but a little bit lower than JPEG2000 and SPIHT when compressing in a higher bit rate. The encoding speed is 2 times faster than that of JPEG2000, 1.5 times faster than that of SPIHT when compressing in a given bit rate, and the speed is directly proportional to bit rate. CCSDS algorithm uses a simple encoding method withour feedback operation, which can be used in image compression system with alterable memory, and also can effectively prevent error propagation. Therefore, it will be a great value for application on spacecraft.

关 键 词：图像压缩 小波变换 位平面编码 误码扩散 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]