Extended SOT Wavelet Packet Coding Algorithm for Remote Sensing Images

Ordinary image compression codec are not good choices for remote sensing images and always lose crucial features, such as edges and texture, during the coding procedure. A new compression scheme is proposed based on wavelet packet which has good performance on image detail processing. The problems arising from the application of zerotree-based algorithm to wavelet packet transform are analyzed. A generation version of parent-children relationship, named Extend Spatial Orientation Tree, to solve the parental conflict is defined and we complete the algorithm combined with SPIHT to get a new compression scheme: Extended SOT wavelet packet coding (ESOT-WPC). The experimental results show that, under the same compression rate, the new codec method outperforms SPIHT both visually and in terms of PSNR.