摘要
文中分析了嵌入式零树小波图像编码算法 (EZW ) ,发现算法中对重要系数进行的重复扫描编码是可以避免的 ,于是提出了新的算法 ,通过采取“剔除重要系数”步骤 ,避免了EZW算法中对重要系数进行的重复扫描编码 ;并且在算术编码前对符号流进行游程编码 ,减少了零树间的冗余 。
This paper analyses the EZW algorithm, finding that the EZW algorithm repeating coding the significant coefficients can be avoided. So the new algorithm in this paper proposes ”winkling” the significant coefficients to avoid repeating coding them. Moreover it takes running length coding for symbol bitstream to reduce the redundance among zerotrees. Experiments prove that these measures are of certain effect that cannot be neglected for improving the compression rate.
出处
《计算机应用》
CSCD
北大核心
2004年第7期52-53,共2页
journal of Computer Applications
关键词
小波变换
EZW
游程编码
wavelet transform
embedded zerotree of wavelet coefficients
runing length coding
