二维正态分布函数值的计算是估算串联结构体系失效概率上、下限的一项重要内容。
It is an important aspect to compute the two dimensional distribution in estimating the bounds of failure probability of series structures.
考虑到图像的概率特性，通过引入二维正态分布函数，准确合理地表示图像像素间的相关性。
Because of the possibility characteristics of images, the planar normal distribution function was adopted to present the pertinence of pixels accurately and reasonably.
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