The sharp increase of image information makes image retrieval technology develop fast too. 摘要图像信息的急剧增长，使得图像检索技术也获得迅速发展。
Arbitrary shape image compression is of special significance of the fast transmission and real-time processsing of digital image information in internet. 任意形状图像压缩对于数字图像信息在网络上实现快速传输和实时处理具有重要的意义。
