一种基于小波变换的遥感图像压缩算法

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.

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

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.