极值点

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。

In fourth chapter of this paper,we mainly investigate the properties of a subclass S_p~* of starlike functions of orderα,including its coefficient estimate,distortion theorem,closure theorem and extreme points theorem.

在第四章中，我们主要研究了α次星形函数一类子族S_p~*的性质，包括系数估计，偏差定理，闭包定理，极值点定理。

Defined object function can extract the extremal point s located accurately,form the stable extremal regions,and magnify the local intensity changes.

提出了一种基于不变区域提取算法，通过灰度指数变换，定义的目标函数不仅提取了定位准确的极值点，形成稳定的不变区域，而且突显了每个方向上灰度的变化。

By reason of the dipole directivity of particle velocity sensor and also the acoustic intensity averagor, and its being able to realize the electronic rotation, coherent interferences can be effectively suppressed by skillful use of its zero point and extremal point.

振速传感器和平均声强器具有偶极子指向性，并且该指向性可实现电子旋转。巧妙利用偶极子指向性的零点和极值点，可有效地抑制声场中的相干干扰。

Search Gaussian function to the extreme point.

用来搜索高斯函数的极值点。

In the space of all possible computation and learning, then, natural selection holds a special position. It occupies the extreme point where information transfer is minimized.

因此，在所有可能的计算和学习的空间中，自然选择占居了一个特殊的位置，它占领了信息传递最小化的极值点。

At last, the simulation result shows that this algorithm can rapidly find the global extremum point.

仿真结果表明，该算法能够快速地找到全局极值点。

In general, small targets always are the extremum pixels in image local area.

摘要弱小目标一般是图像局部区域的极值点。

Has no or finite discontinuity points in one period

在一个周期内至多只有有限个极值点

An modified BFGS algorithm to solve the unconstrained optimization, whose Hessian matrix of the minimum point of the convex function is rank one defect, is presented in this paper.

本文对凸函数在极值点的Hessian矩阵是秩亏一的情况下，给出了一类求解无约束优化问题的修正BFGS算法。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。