曲面

A algorithm of dim small targets detection in infrared image is proposed. Image is processed by using median filter and unsharp mask. The infrared image intensity surface is fitted by Haralickd discrete orthogonal polynomial basis function,and then the maximum points are detected on the fitted intensity surface by convolving the image with the second order directional derivative operators.

提出一种红外弱小多目标图像检测方法，图像先经过中值滤波、高提升滤波增强处理，再用基于Haralick离散正交多项式曲面拟合图像，拟合曲面的极大值点即目标点，可以利用导出的二阶方向导数算子与图像进行卷积得到。

ABSTRACT In this dissertation, the architecture of the robot model machining system is introduced, and the surface reconstruction, triangulating the discrete surface, process planning and path planning in the machining system is deeply and systematically investigated.

本论文对机器人模型加工系统的组成结构、模型加工中的曲面重建、空间离散点曲面的三角划分以及模型加工的工艺规划和路径规划等方面，进行了系统、深入的研究。

Is a directed surface. is the unit normal vector of at ,then is called the flux of the vector field across ,and is called the divergence of the vector field ,denoted by div .

是场内的一有向曲面，是在点处的单位法向量，则叫做向量场通过曲面的通量，而叫做向量场的散度，记做。

Then,the edge surfaces lost during the de-noising step are recovered based on the connectivity of edge surfaces.

实验结果表明，文中算法克服了边缘曲面抽取算法抽取的边缘曲面有洞的缺陷。

In the end, the finite plate element method to unfold the curved surfaces is talked over in this chapter.

另外，在实际工程应用中，裁剪线两侧相邻的曲面片的边的边长在各自利用等效有限单元法展开时存在差异，且当曲面比较大时，这个误差较大，从而给施工带来不便，本章提出了修正的等效有限杆单元法，较好地解决了这个问题。

This paper gives the Euler characteristic of 2-dimemsional surfaces with crosscaps and surfaces with boundaries.

本文给出了带有交叉帽的二维曲面和带有边缘边的二维曲面的欧拉示性数。

From this equation we obtain the evolution equation of the image surface using the connection of the surface evolution and its level lines.

由这个演化方程，利用曲面演化和其水平线演化之间的关系，得到关于图像曲面的演化方程。

The experimental data shows that the presented algorithm is fasr, accurate and robust. The reconstructed surface has good smoothness and extensionality. It can be well applied to reconstruct B-spline surface from mesh model after data segmentation in reverse engineering.

实验结果表明：该算法速度快、拟合精度高、鲁棒性强，重建的曲面具有良好的光顺性和可延伸性，适用于逆向工程中对经过数据分割后的网格模型的自由曲面重建。

The method, by making use of Least Square Support Vector Machine well fits the star image intensity surface over the neighborhood, and determines the maximal extremal points on the fitted surface, and then obtains possible star centers.

提出一种新的星图中星获取算法－极值点法，利用最小二乘向量机对原始星图的局部区域作灰度曲面最佳拟合，在拟合曲面上求解灰度极大值的像素点，获得星的中心点的初步位置。

Extremal mappings have been one of the main topics in the theory of quasiconformal mappings, n the section 4, we consider the extremal mappings on the surface Rwhere every Ri is a hyperbolic Riemann surface, Ri Rj =,i j,I is a non-empty indexset.

拟共形映射的极值问题是拟共形映射理论中的又一重要课题，在文章的第四章中，我们将考虑曲面R=U R_i i∈I上的极值问题，其中每个R为双曲Riemman曲面，R_i∩R_j=φ，i≠j，I为非空指标集。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。