direction distribution

A novel concept on the continuously distributed directional image/field (CDDF) and the method to compute it in the fingerprint images are developed, which transits smoothly and exhibits not only good continuity,gradualness and excellent robustness to the noises, but also very high precision.

提出了指纹连续分布方向图(场)的概念及其算法,这种连续分布方向图过渡平滑、自然,具有很好的连续性、渐变性和抗噪性,同时又具有极高的精确度,兼有指纹点方向图的连续过渡性和块方向图的抗噪性优点,对低质量指纹图像具有良好的鲁棒性,能更精确地反映指纹脊线的结构特征,提高自动指纹识别系统AFIS(AutomatedFingerprintIdentificationSystem)的性能。

A new concept on the continuously distributed directional image/field(CDDF) and the method to compute it in the fingerprint images are proposed,which exhibits not only good continuity,well gradualness,and excellent robustness to the noises,but very high precision,as well.

本文提出了指纹连续分布方向图(场)的概念及其算法,连续分布方向图具有很好的连续性、渐变性、抗噪性和较高的精确度;对经典的PoincaréIndex计算公式和指纹奇异点检测算法进行了改进,改进后的PoincaréIndex不仅能精确表示向量场的旋转角度,而且还能精确表示向量场的旋转方向,能够在像素级水平精确定位指纹奇异点(core点和delta点)。

ozone's horizontal distribution

臭氧的地平方向分布

4. The magnetic lineations mainly dip to the north hemisphere and part of them developed near south-north direction.

4.磁性线理主要倾向北半球,而且部分磁性线理近南北方向分布。

Analysis of Array Antenna Pattern Amplitude in Uniform and Taper Distribution

阵列天线幅度均匀分布和锥削分布方向图分析

nocturnal ozone profile

夜间臭氧垂直方向的分布

It is the distribution of energy that determines the direction of spontaneity.

决定自发方向的是能量的分布。

Experimental Study on Vertical Load Distribution of High-stacked Culvert

高填方涵洞竖向荷载分布的试验研究

Directional Distribution of Lighting and WebGIS Displaying Platform

雷电方向性分布与WebGIS平台展现

DOA Estimation of Distributed Source Using Vector-Sensors

矢量传感器阵列分布源波达方向估计

A NEW APPROACH FOR MODELLING THE VERTICAL STRESS DISTRIBUTION AT THE SOIL SURFACE

模拟土壤表面竖向应力分布的新方法

Directional Overcurrent Protection for Distribution Systems Containing Distributed Generation

含分布式电源的配电网方向过流保护

The Julia Directions of the Value Distribution of Holomorphic Curves in P~n(C)

P~n(C)上全纯曲线值分布的Julia方向

Vein Image Segmentation Based on Distribution Ratio of Directional Fields

基于方向场分布率的静脉图像分割方法

Aspect-Oriented Modeling Method on Distributed Heterogeneous Real-Time System;

分布式异构的实时系统的面向方面建模方法

Studies on Bearing Estimation and its Performance Analysis for Spatially Distributed Sources;

空间分布源波达方向估计及其性能分析研究

Performance Analysis for Distributed Real-Time Software with Aspect-Oriented Technology;

面向方面的分布式实时软件的性能分析

night-time ozone profile

夜间臭氧垂直方向的分布 不同高度的臭氧浓度

The pressure distribution was simulated with a approximate method.

采用近似方法模拟径向滑动轴承压力场分布。

Boolean Orientable Difference and its Application in Eault Diagnosis

布尔方向差分及其在故障诊断中的应用