方差分布 meaning in Chinese

distribution of variance
variance distribution

2 ) evaluation of robustness against noise removal attack . by analyzing the mathematical models of noise removal attack , we deduce some indexes for robustness evaluation defined in frequency domain , power spectrum and locally variances of difference images . 3 ) evaluation of the detectability of lsb information hiding algorithm
考察了密信信号隐藏后差值图象的频域特性、功率谱特性和局部方差分布特性，建立了频域特性与线性滤波攻击效率、功率谱特性与维纳滤波攻击效率、局部方差分布特性与最大后验估计攻击效率之间的关系。