方向场

词组短语

direction field · directional field

与方向场相关的网络例句 [注：此内容来源于网络，仅供参考]

It separated 3-D space, 2-D space, temporal space and abstract space (focused on the first 3). 3-D space/2-D space belong to the same category in syntactic model; but 2-D space/ temporal space /abstract space share the same category when we talked about how to confirm the spatial direction. 2. It investigated a spatial system proposed by Mr. Qi Huyang, and argued that there is necessity to modify this system. 3. It enumerated a series of grammatical forms which are involved in the "Spatial System", and pointed out that there exits a relation among these forms: words representing "Spatial and Locative"→ phrases representing "Spatial and Locative"→ sentences representing "Spatial and Locative".

第三章研究"空间系统"的子系统。1、分出立体空间、线性空间、时间和抽象空间几大领域，在句法上，立体空间/线性空间是一类；但在如何确定方向场的问题上，线性空间/时间/抽象空间是一类。2、省视了齐沪扬先生已提出的一个空间系统体系，指出很有改进的必要。3、归纳了"空间系统"所涉及的各种语法形式，并指出它们构成"表示空间方位意义的词→表示空间方位意义的短语→表示空间方位意义的句子"的层次关系。4、辨析各种语法形式的语义域及其语义结构，并考察语法意义与语法形式的对应情况。

The experimental results show that it is possible to represent the directional field of fingerprint and extract the desired features.

即使指纹图像有所旋转，该算法也能得到确切的方向场。

Depending on a reliable directional field, it can immediately extract some important features such as the center of whorl, ridge and furrow on fingerprint.

依据可靠、误差较小的方向场可以准确快速地找到诸如指纹螺旋中心等特徵，并且使快速提取指纹图中沟和脊的特徵成为可能。

Using the directional field information,Poincare index can detect the discontinuous point in the directional field——singularities.According to the number of singularities,their position and structural character of fingerprint's ridge lines,the basic category of fingerprint is classified.

利用指纹图像的方向场信息，用Poincare索引值检测出方向场中不连续的点——奇异点，根据奇异点的数目和相互位置关系以及指纹脊线的结构特征确定指纹的基本类型。

Then, the minutiae sets are aligned globally through coordinate transform, and the alignment parameters are optimized by using affine transform and least square method. Finally, minutiae matching and directional field matching are respectively achieved based on the minutiae alignment, and the two matching scores are fused into a single to obtain a more reasonable result. Experimental results show that this method contributes to ensure the accuracy of fingerprint identification as well as possesses the real-time performance.

该算法首先利用脊线信息快速确定满足局部匹配要求的细节点对，在此基础上进一步通过全局坐标变换完成细节点的全局配准，并采用仿射变换模型通过最小二乘估计对配准参数进行优化，然后在配准的基础上分别进行细节点匹配和方向场匹配，最后对两种匹配分值进行融合，以取得较合理的匹配结果。

In this paper, a gradient based robust method for estimation of fingerprint orientation fields is proposed.

作为指纹的全局特征，指纹方向场在自动指纹识别系统中发挥了非常重要的作用。

Fingerprint singular point location based on DFT of orientation field and corner detector.

基于方向场DFT和角点检测的指纹奇异点定位。

We present a novel approach for vector field guided solid texture synthesis from 2D examples.

提出一种考虑方向场的体纹理合成新方法。

Orientation field near core point is changeable which is influenced by core point. Then fingerprint orientation field outspreads. At last, orientation field converges at delta point. This model can explain well why core and delta points exist in pairs in fingerprint images.

基线区域和中心点区域的指纹方向场向外扩张，在三角点区域汇合，且三角点是最终的汇合点，这一模型能比较好地解释指纹中心点和三角点成对出现的原因。

This new method mainly comprises three steps: firstly, normalize the point-gradient vectors and calculate the block-gradient vectors and the corresponding block-coherence; then detect the noisy areas to eliminate the side effect of noise diffusing; finally, re-estimate all block- gradient vectors based on iteration and transform the gradient field to orientation field.

提出了一种基于梯度的健壮的指纹方向场估计算法，新算法首先归一化点梯度向量并计算块梯度向量及相应的块一致性；然后估计噪声区域；最后采用基于迭代的方法，重新估计所有块梯度向量并将梯度向量场转化为方向场。

与方向场相关的网络解释 [注：此内容来源于网络，仅供参考]

ADI：交替方向隐式法

本文采用压强连接的隐式修正(SIMPLE-C)算法,在贴体网格坐标下对控制方程进行有限差分离散后,用交替方向隐式法(ADI)求解线性方程组,在考虑旋转与曲率的影响下修正采用k-ε湍流模型,由此求解了低比速离心泵叶轮内三维不可压湍流场,

direction field：方向场

direction cosine 方向余弦 | direction field 方向场 | direction of principal axis 轴方向

sector field direction focusing：扇形场方向聚焦

sector disc 扇形盘 | sector field direction focusing 扇形场方向聚焦 | sector instrument 扇形场仪器

direction of principal axis：轴方向

direction field 方向场 | direction of principal axis 轴方向 | direction of principal curvature 助率方向

directional differentiation：方向微分法

directional derivative 方向导数 | directional differentiation 方向微分法 | directional field 方向场

directional field：方向场

directional differentiation 方向微分法 | directional field 方向场 | directivity 方向性

field effect transistor：场效应晶体管

※ 场效应晶体管 场效应晶体管(field effect transistor)利用场效应原理工作的晶体管. 英文简称FET. 场效应就是改变外加垂直于半导体表面上电场的方向或大小,以控制半导体导电层(沟道)中多数载流子的密度或类型. 它是由电压调制沟道中的电流,

vector field：矢量场

相比之下,磁场是一种矢量场(vector field),除了场强以外,在空间的每个位置还要指明一个方向,才能完全描述磁场的性质. 天气预报为这两种场都提供了例子:温度和气压是标量场,而风速则是矢量场. 很明显,

sound source：在自由场情况下,这种声源辐射的声音在任何方向都一致

** harmonic current 简谐波电流 | ** sound source 在自由场情况下,这种声源辐射的声音在任何方向都一致 | ** ton 单音

simple sound source：在自由场情况下,这种声源辐射的声音在任何方向都一致

simple harmonic current 简谐波电流 | simple sound source 在自由场情况下,这种声源辐射的声音在任何方向都一致 | simple ton 单音