查询词典 probability distribution function

Mathematical statistics ; least squares method ; probability ; normal distribution ; error function

数理统计学；最小二乘法；概率；正态分布；误差函数

By the minimum risk Bayes decision theory, this paper develops a new way of image segmentation: establish the mathematics model of image segmentation; estimate the probability density of grey scales and figure out its math-expectation and square difference that accord with normal distribution and the loss function; and judge the every pixel dot in the image according to the minimum risk Bayes decision theory and determine whether it is of target or non-target images, thereby realizing the extraction of the target image.

依据最小风险贝叶斯决策理论，提出了一种基于最小风险贝叶斯决策的图像分割方法。首先建立图像分割的最小风险贝叶斯决策模型，对灰度级类条件概率密度估计出其符合正态分布的数学期望和方差以及损失函数，再依据最小风险贝叶斯决策理论对图像中的每一像素点进行目标图像和非目标图像的类别判断，从而实现目标图像的提取。

Firstly, Dempster-Shafer is developed by not only considering the certainty of the evidence, but also considering the average support of the evidence to different subsets in the assignment framework so that it can give more reliable combination result. Secondly, amplitude ratio feature and Euclid distance of the probability density distribution function in Pearson graph from different temporal SAR images are extracted to present change feathers in different scales. Finally, the improved Dempster-Shafer algorithm is applied to fuse the two different features to detect change information of SAR images.

首先通过综合考虑证据本身的确信度和证据对辨别框架中子集的平均支持度进行证据间的加权合成，改进证据理论对证据的合成，提高其可靠性；然后提取不同时相图像间的散射幅度的对比度和概率密度分布函数在皮尔逊图中的欧式距离，两种特征参数代表了像元级和区域级不同空间尺度下微波遥感图像中关于地表变化的信息；最后将改进的证据理论用于两特征之间的融合处理，得到地表的变化信息。

With increase of voltage, the distribution for larger droplets became narrow and the curve shape of probability density function became nearly symmetric.

随着电压的升高，大雾滴尺寸分布有所变窄，概率密度曲线趋近对称。

We found that different relative rainfall area associated with different probabilities, thereby formed a probability distribution function.

发现不同的雨区相对面积联系着不同的概率，从而形成了一个概率分布函数。

The expressions have been obtained for the quasi-steady-state probability distribution function.

得到了系统的准稳态概率分布函数。

The simulation results demonstrate that there is locally favorable distribution in the probability density function of the basic random variables in bounded environment.

仿真结果表明，在有约束环境中该基本随机变量的概率密度分布显示出明显的局部偏好性。

Firstly, the basic concepts of risk are introduced, and the relation between risk and probability distribution, and the utility function are analysed.

本文首先介绍了风险基本概念、风险与概率分布的关系、风险与效用函数等，总结了国内外风险管理发展概况。

To assess the frequency of wind speeds at a particular location, a probability distribution function is often fit to the observed data.

评估的频率，风速在特定的位置，一个概率分布函数往往是适合的观测数据。

The shape parameter of probability density distribution function is adjusted to match the characteristics of fMRI.

通过调节其概率密度分布函数的形状参数，实现与fMRI感兴趣信号的分布特性更好地匹配。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。