The use of moments for image analysis is straightforward if we consider a binary or gray level image segment as a two-dimensional density distribution function.

若把二值图或灰度图看作是二维密度分布函数，就可把矩技术应用于图像分析中。

youdao

This paper analyzes the probability density distribution of the non-soluble deposit density, and hence deduces a combined probability density distribution function.

笔者分析了灰密的概率密度分布，并推导出盐密与灰密的联合概率密度函数。

youdao

Figure 1 shows a typical normal probability density function, so called because most observations fall into this sort of distribution.

图1显示了一个典型的正态概率分布函数，这样命名是因为绝大多数值都属于这个分布范围内。

youdao

We can talk about the wave function squared, the probability density, or we can talk about the radial probability distribution.

我们可以讨论它,波函数的平方，概率密度，或者可以考虑它的径向概率分布。

麻省理工公开课 - 化学原理课程节选