一种具有抗误码性能的树块压缩算法  

A Novel Tree-block Compression Algorithm with Anti-error Propagation

作　　者：易巧玲[1] 邓家先[1] 王海荣[1] 王成成[1] 

机构地区：[1]海南大学信息科学与技术学院,海南海口570228

出　　处：《通信技术》2010年第7期163-164,212,共3页Communications Technology

摘　　要：星载图像编码系统要求图像压缩算法具有一定压缩比、低复杂度的特点,同时希望尽可能减少码流比特错误造成的误码扩散。为了减少误码扩散,提出了一种易于硬件实现、低复杂度、抗误码强的树块数据无损压缩算法。图像数据经过小波变换后,将各级分辨率的系数按照树的结构进行排序,并由若干棵相邻的树构成树集合,称之为树块,每个树块独立进行比特平面编码,产生的码流独立进行打包。结果表明,这种编码方法有较低复杂度,易于硬件实现,能够有效优化,使输出码率达到最短,而且可以有效提高系统的抗误码性能。Satellite image coding system requires a compression algorithm with low complexity and certain compression ratio,and the most important feature for the algorithm is that measures must be taken to prevnet the error propagation as early as possible.Thus a tree-block data lossless compression algorithm is proposed with low complexity,good error feature and easy hardware implementation.Coefficients at all levels filtered by discrete wavelet transform are sorted in accordance with the structure of the tree,and a number of neighbor trees constitutes a tree collection,called tree_block.Every tree-block is encoded independently,and the generated code stream also packaged independently.The experiment results show that the algorithm is in low complexity and easy hardware implementation,and of good error feature.The ratio could be optimized,and a minimum output bit ratio thus be achieved.

关 键 词：图像数据无损压缩 比特平面编码 树块 

分 类 号：TN919.81[电子电信—通信与信息系统]