Now, what's the gradient vector?
现在，梯度向量是什么呢？
The gradient vector would be going perpendicular to the level.
梯度向量应该垂直于等值线。
If I fix a point, then the gradient vector at that point is given to me.
确定一点，那么对我来说，这点的梯度向量就是确定的。
So, we said when we have a function of two variables, we have the gradient vector.
我们说，当一个二元函数存在时，就有梯度向量。
And we have learned how to package partial derivatives into a vector, the gradient vector.
我们也知道了，如何将各个偏导组合成一个梯度向量。
We discuss several different definitions of directional derivative and gradient vector.
讨论了几种不同的方向导数和梯度的定义。
We presented a novel and fast convergent skeleton snake model based on gradient vector flow (GVF).
提出了一种基于梯度矢量流(GVF)的快速收敛骨架snake算法。
The discrete gradient vector filed based on the Morse theory is presented, and is applied to visualization of topologies.
研究了基于莫尔斯理论的离散梯度向量域方法，并将其应用于拓扑可视化。
A new ellipse extraction algorithm based on the ellipse-special deformable templates and gradient vector flow (GVF) was proposed.
给出一种结合梯度矢量流(GVF)及椭圆变形模板的椭圆提取新算法。
In this paper the transmission of paraxial light beams was analyzed based on the gradient vector potential of electromagnetic field.
本文运用电磁场的梯度矢势分析了一般情况下傍轴光束的衍射传输问题。
According to features of edge gradient maps of face images, a new eye feature extraction algorithm based on gradient vector flow field was proposed.
根据人脸图像的边缘梯度图提出了一种新的基于梯度向量流场的眼睛特征提取方法。
OK, so the new definition for today is the definition of the gradient vector. And, our goal will be to understand a bit better what does this vector mean?
所以今天我们的新定义，就是梯度向量，目的就是更好的理解这一定义，这个向量的含义是什么？
The formula of the gradient vector of every performance function is derived, and the iterative and recurrence formulas of collapse probability of section are obtained.
由截面各类复合内力的极限状态建立截面破坏的各类功能函数，导出了各类功能函数的梯度向量计算公式，以及破坏概率计算的迭代、递推公式。
At the same time, how to get the approximate road hollow position is solved to realize the road contour extraction by gradient vector flow model with iterative solution.
通过梯度矢量流模型迭代求解，解决道路凹陷位置逼近问题，最终实现道路提取。
In this thesis, a new deformable model called Iterative Gradient Vector Flow (IGVF) is developed.
本文提出了迭代梯度矢量流参数变形模型(IGVF)。
In this thesis, a new deformable model called Iterative Gradient Vector Flow (IGVF) is developed.
本文提出了迭代梯度矢量流参数变形模型(IGVF)。
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