查询词典 quadric

The results show that the proposed method provides accurate highresolution segmentation results, which has only 0.80% misclassified pixels, while the quadric surface classifier has 0.97% misclassified pixels.

实验结果表明新方法提供了更精确的分割结果，仅有0.80%的像素分割错误，而二次曲面分割法的错误率为0.97%。

It is shown that from the comparison among the results with the calculation methods by surface fitting, quadric surface fitting, and other neural network methods, the accuracy by using the standardization of BP neural network algorithm for elevation fitting is more reliable and stable.

将该方法得到的计算结果与平面拟合、二次曲面拟合及其他神经网络方法计算的结果进行对比得出：标准化动量BP神经网络算法求解高程，精度可靠且稳定。

Aiming at the deficiency of the current fingerprint segmentation method at pixel and the segment limitation of the linear classifier, a new method of segmentation based on quadric surface model is proposed.

文中分析了指纹的前景点和背景点在指标CMV(C指像素点的方向一致性、M是像素点的平均灰度、V是像素点的平均灰度方差)下的空间分布特点，发现该空间下的指纹前景和背景区域具有线性不可分性，使用线性分类器进行分类具备一定局限性。

Random sampling consensus algorithm ; Triangular mesh ; Quadric surface extraction

随机抽样一致性算法；三角网格；二次曲面提取

Some questions in digital elevation model were discussed detailedly, such as the obtaining of data points, the fast searching of reference points, the interpolation algorithm of quadric surface, the abnormal data eliminating, and so on. And this paper has realized the 3D vectorization of 2D terrain maps, the 3D display and edit of DEM data with the help of secondary development of CAD.

文中详细讨论了数字高程模型中数据点获得、参考点的快速搜索、二次曲面的插值算法、粗差剔除等内容，并运用AutoCAD二次开发技术，实现了二维地形图的三维矢量化以及DEM数据的三维显示和编辑修改。

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。

On ray tracing algorithm, line-surface intersection is the basic operation. we have studied the intersection method between line and plane region, quadric surface, NURBS surface.

在光线跟踪算法方面，对精确模型下曲面的直接光线跟踪进行了尝试，提出了对平面区域、简单二次曲面及NURBS曲面直接进行光线跟踪的算法。

Based on data cloud, which is measured from 3-coordinate measuring machine or so, an algorithm to search lopological structure from 3D unorganized points using Envelopment-box technology is proposed in this thesis. Based on this method, we searching neighbor points of sampling point. We also improve the Max-Min angle criteria to realize local triangulation, and then get the normal of sampling point from the triangulation. Using the normal and neighbor relationship, classification of scattered data points is realized according to the quadric surface.

本文以测量得到的曲面数据点点云为基础，提出了一种基于包围盒的自动寻找三维散乱数据点之间拓扑结构的方法，采用该方法寻找采样点的邻域结点，并对三角剖分中的典型优化准则—最小内角最大准则提出了改进，按照改进后的优化准则实现了采样点的局部三角划分，并进一步求解得到采样点的法向量，依据法向量及邻域拓扑关系在二次曲面的基础上实现了散乱数据曲面重构中的数据点的自动分类。

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。

It is very helpful to instinctively understand the morphology of the QSIC such a quadric pencil has.

它们对直观上理解两二次曲面交线的拓扑形态有非常重要的意义。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。