查询词典 derivative

Derivatives in higher dimensions, directional derivative and gradient.

在多维度中的微分、方向导数和梯度。

It is not so for nonlinear operators, such as the directional derivative along the gradient.

它不是所以为例如沿着坡度方向的派生物非线性的操作员。

The gradient of f; its dot product with uw is the directional derivative of f in the direction of w

f f 的梯度；它与 uw 的内积为 f 在 w 方向上的方向导数

This formula first scales the magnitude to become the average arc length, and then it scales again to account for the other directional derivative.

这个公式首先将量级缩入成平均弧长，然后又在另一方向的导函数上进行缩放。

According to the multi-scale propagation characteristic of image edge and noise as well as principle of edge detection using wavelet transforman,an algorithm based on cubic B-spline wavelet and directional derivative is presented.

根据图像边缘及噪声的多尺度传播特性和小波边缘检测的基本原理，提出了一种基于方向导数和三次B样条小波的边缘检测算法。

Theorem Let be differentiable at. Then has a directional derivative at in any direction and

定理 如果函数在点可微分，那么函数在该点沿任一方向的方向导数存在，且有

In this paper, a new edge detection method——method using extremum of first directional derivative is proposed, based upon a general gradient edge model.

文中通过傅里叶变换，在频率域，通过求垂直于边缘的一阶方向导数，并检测其极值点来确定边缘。

A new structure tensor integrating the second-order directional derivative information is designed, which can precisely analyze complex weak edges in the image.

摘要一致性扩散是分析图像中定向结构的重要的预处理步骤，现有的一致性扩散图像增强方法难以识别图像中的弱边界。

Edge detection ; first directional derivative ; extremum ; Fourier transform

边缘检测；一阶方向导数；极值；傅里叶变换

In the new method proposed, gradient direction is not directional derivative but optimized result of chaos search in local area.

该方法先在局域内用混沌优化搜索局域最优点，再将此最优点作为梯度方向，通过改变局域范围跳出局部寻优区域。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。