n.电报密码本

This method utilizes VQ and LBG algorithm to design the codebook. 该方法使用了向量量化技术并采用LBG算法设计码本。

Ciphers are more convenient than codes in some situations, there being no need for a codebook. 有些情况下，“密码”比“编码”更方便，因为“密码”无需反复查询密码本。

In this theory，all codewords in codebook are rotated to four hieratical directions to check their correlations. 提出了将码书中的码字旋转压缩的理论。

One is the robustness against channel noise;the other is the computational complexity of codebook search. 第一个是增加向量量化的抗杂讯能力，另一个则是减少码书搜寻的复杂度。

This paper proposes an efficient codebook design algorithm for image compression. 摘要提出了一种高效的矢量量化码将设计算法。