曲面

For fingerprint segmentation, aiming at the deficiency of existing method, we first bring forward a new thought of fingerprint segmentation based quadric surface model and carry it out.

在指纹图像分割方面，针对现有指纹图像分割方法存在的不足之处，首次提出采用二次曲面对指纹图像进行分割的思想，并使用该思想实现了基于二次曲面模型的分割方法。

It can be indicated by the practical example that the fractal-interpolated surface function is obviously superior to the quadric polynomial surface for the fitted accuracy of the height anomaly.

实例计算结果表明，分形插值曲面函数拟合高程异常的精度明显优于二次多项式曲面。

A two-dimensional sine quadric surface model accord with the ridge gray distributing rule was designed, and a fingerprint enhancement algorithm was produced based on the model after analyzing the basic character of the fingerprint image.

在深入分析指纹图像的基本特征及其对正弦曲面相似性的基础上，构造符合指纹局部区域纹线灰度分布规律的正弦曲面滤波器模型，并提出了基于该模型的指纹增强算法。

This paper proposes an algorithm to recognize and reconstruct the skewed quadric surfaces based on the analysis of their projection features.

在分析斜截切二次曲面在三视图中的投影特性的基础上，提出识别和重建这类曲面的算法。

Quadric surfaces are the simplest curved surfaces and are widely used in CAD/CAM or solid modeling.

二次曲面作为表示形式最简单的一种曲面，在CAD／CAM以及立体造型中有非常广泛的应用。

When using quadrilateral or triangular surface reconstruction directly, fairness of the surface could not be guaranteed.

由于这类复杂曲面原始数据分布不均匀，常规的四边域曲面拟合方法的效果不好11。

Rational planar curve; rational space curve; rational ruled surface; moving curve/surface;μ-bases; singularity; self-intersection curve; moving curve/moving surface ideal; ideal-theoretic/set-theoretic generators

基础科学，数学，几何、拓扑平面有理曲线；空间有理曲线；有理直纹面；动曲线/曲面；μ基；奇点；自交线；动曲线/动曲面理想；集论/理想论生成元

The article that bases NURBS curved surface elements accomplish the programming of converse software by Visual C++,it is convenience to redintegrate curved surface after gathering point cloud.

基于NURBS曲面原理，采用Visual C++完成了逆向软件的编制，使得对采集的点云进行曲面重构较为方便。

Actually, the reparametrization method of Bézier surface is included in the theory of BBC surface. In this sense, the theory of Bézier surface is consummated and a simple reparametrization tool of Bézier surface is given.

对它的研究丰富了Bézier曲面的基本内容，同时提供了一种计算简单、操作方便、适用范围广泛的Bézier曲面重新参数化工具。

The conversion problem between rational S-patches and rational triangular Bézier patches was investigated with the reparametrization method.

采用重新参数化方法研究有理S曲面片与有理三角Bézier曲面片之间的相互转换问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。