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quadric

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quadric adj.【數學】二次的；二次曲面的。n.【數學】二次；二...

adj. 【數學】二次的；二次曲面的。 n. 【數學】二次；二次曲面。 “absolute quadric“ 中文翻譯：   絕對二次曲面“axis of a quadric“ 中文翻譯：   二次曲面的軸“central quadric“ 中文翻譯：   有心二次曲面“centre of quadric“ 中文翻譯：   二次曲面心“confocal quadric“ 中文翻譯：   共焦二次曲面“cubature of a quadric“ 中文翻譯：   求體積法“degenerate quadric“ 中文翻譯：   退化二次曲面“elongation quadric“ 中文翻譯：   伸長二次曲面“generator of a quadric“ 中文翻譯：   二次曲面的母線“improper quadric“ 中文翻譯：   退化二次曲面; 異常二次曲面“model of a quadric“ 中文翻譯：   二次曲面模型“noncentral quadric“ 中文翻譯：   無心二次曲面“nonsingular quadric“ 中文翻譯：   非奇異二次曲面“osculating quadric“ 中文翻譯：   密切二次曲面“projective quadric“ 中文翻譯：   射影二次曲面“proper quadric“ 中文翻譯：   真二次曲面; 正常二次曲面“quadric cone“ 中文翻譯：   二次錐面“quadric cylinder“ 中文翻譯：   二次柱面“quadric discriminator“ 中文翻譯：   二次判別器“quadric equation“ 中文翻譯：   二次方程“quadric form“ 中文翻譯：   二次型; 二次形式“quadric hypersurface“ 中文翻譯：   二次超曲面“quadric of deformation“ 中文翻譯：   形變二次式“quadric of revolution“ 中文翻譯：   回轉二次曲面“quadribasic“ 中文翻譯：   四堿價的“quadric crank chain“ 中文翻譯：   四桿曲柄鏈條; 四節曲

quadricentennial

Some new ideas are proposed in this thesis based on svm and ica : firstly , a modified svm method based on posteriori probability theory is given , which makes the classification super plane corrected from the original one . a better classification result is obtained without finding the best quadric optimization algorithm and large scale training datasets are reduced to small scale training datasets at the same time . secondly , ica is applied to the preprocessing period of the recognition character images for purpose of feature extraction and dimension reduction 本文在系統研究svm和ica的基礎上提出了以下新的觀點：其一是采用了引入后驗概率的修正svm方法，它在原分類超平面的基礎上不斷修正分類超平面，提高分類正確率，從而避免了尋找最優二次規劃的麻煩，同時將大規模訓練樣本集化為小規模訓練樣本集；其二是應用獨立分量分析ica對需要進行識別的字符圖像預處理，提取字符特征，降低輸入數據的維數，從而可以為下一步的svm識別過程提供好的數據集，用以提高識別率和識別速度。

Wavelet edge detection technology was applied to image segmentation of blasted muck - pile , in which quadric bspline wavelet and a method of adaptive thresholds edge detection for image based on wavelet transform were applied , and methods of expanding and deleting short chain were used to delete untrue edge better 摘要把小波邊緣檢測技術應用于爆堆圖像分割處理中，采用基于最優條件下二次b樣條小波和自適應模極大值的圖像邊緣檢測算法，綜合運用膨脹技術和短鏈刪除技術，很好的去除了偽邊緣。

This dissertation proposes an algorithm to detect edges and extract contours from medical images based on quadric spline wavelets transform . the algorithm can generate single , continuous and close contours . there are two main methods of surface reconstruction ? explicit connecting contours method and implicit function method 利用小波變換良好的局部化特性和其固有的多尺度特性，具體針對醫學圖象邊緣輪廓提取的特點，提出一種基于二次樣條小波變換的邊緣檢測和輪廓提取方法，提取出單像素和連續封閉的邊緣輪廓。

Abstract : brief introduction to ( 2 ) cascading nonlinearities is presented . the enhancement mechanisms for optical kerr effect and the photorefractive effect as ( 2 ) cascading process are discussed . mutual inductance between quadric and cubic nonlinearities opens possibilities for engineering optical nonlinearities 文摘:介紹了( 2 )串級非線性.討論了串級光克爾非線性和串級光折變非線性的增強機制，并指出二階和三階非線性的相互轉化，為光學非線性工程設計提供了可行性

By processing real - time digital analog fault vibration signal and adopting minimum quadric multiplication and rectangle function , correct frequency chart will be gained . thus , the system design based on advanced dsp can be applied to the real - time fault diagnosis of rolling bearing in modern high - speed train 通過對采集的模擬的有故障振動信號進行在線實時數字信號處理，并在信號分析方面采用了最小二乘法及加窗函數，以獲得正確的頻譜，通過信號處理，并進行結果比對，進而可證明此系統在高速列車轉向架滾動軸承在線診斷中應用的可行性。

Structural theory / experimental modeling and related analysis , dynamic reduction , structure finite element model updating based on the frequency response function , quadric exploit based on patran are studied in this dissertation about the key point of structure finite element model updating 本文圍繞結構有限元模型修正這一主題,對結構理論/試驗建模、理論/試驗模型相關分析、動力縮聚、基于頻響函數的結構有限元模型修正、基于patran的二次開發等領域展開研究。

This algorithm uses iterative contractions of vertex pairs , to simplify models and maintains surfaces error approximations using quadric matrices . we have applied these two methods to simplify models in our system and have done some improved work on the first one 后者立足于視差效果，用少量帶有紋理和透明的平面來表示原模型，這些平面是相互獨立的，不再包含網格的拓撲信息，模型的幾何細節和側影輪廓線也都是利用紋理和透明保存下來的。

The program we made can calculate all kinds of compensating errors of quadric curve whose calculation accuracy can reach 10 - 6mm . the machining tools we devised can perform the functions of interception of quadric curves and errors compensation , which meets the demand of basic movements 編制出的程序可計算出各種二次曲線的補償誤差，精度可達10 ~ ( - 6 ) mm ，設計出的加工機床可完成二次曲線的截取，補償等功能，滿足基本運動要求。

This one - constraint - less property of the kruppa equations is their inherent deficiency and is independent of camera motion . this deficiency is due to their failure of automatic enforcement of the rank - three - ness on the absolute quadric 從而, kruppa方程的獨立個數比基于絕對二次曲面或基于無窮遠平面的自標定方程的獨立個數少1 ,這是源于kruppa方程不能保證絕對二次曲面的秩為3 ,是由kruppa方程自身的特性決定的，而與攝像機的運動無關。

In this paper , we prove that given n images captured by a pinhole camera with varying parameters and under general motion , the number of independent kruppa constraints is 5n - 9 , and it is less than that of independent constraints from the absolute quadric by only one 本文首次從代數上嚴格證明了，攝像機在通常運動下當攝像機的內參數變化時,從n n 3幅圖像得到的所有kruppa方程中，只有5n - 9個是獨立的

Modern cad systems widely adopt nurbs ( non - uniform rational b - spline ) as the main modeling entity because they can represent other commonly used parametric curves and surfaces , while also being able to precisely present the natural quadric shapes such as cones and cylinders 許多國內外流行的優秀cad cam軟件都聲稱其曲線、曲面模型建立在nurbs (非均勻有理b樣條)理論和方法的基礎上。

In this algorithm , the sharp features on a mesh model are located through analysis of quadric error matrixes of super - neighbor of vertices on the model , so that these features can be preserved during mesh simplification 通過分析網格模型中頂點超鄰域的二次誤差矩陣，對模型上的重要細節特徵進行定位，實現了網格簡化過程中細節特徵的保持。

To overcome and improve traditional bp & display the advantages of nn and inherited algorithm , the essay has put forward nn quadric training method , applied inherited algorithm to nn weight and got the result from training 為克服和改進傳統的份，算法的不足，發揮神經網絡和遺傳算法的優勢，提出一種基于遺傳算法的神經網絡二次訓練方法。

8 guo b . quadric and cubic bitetrahedral patches . the visual computer , 1995 , 11 : 253 - 262 . 9 wang w , qin k . on the existence and computation of rational quartic spherical curves for hermite interpolation 關于參數插值曲面構造的研究綜述一般是先在每三角剖分面上構造邊界曲線，而后再用一片或多片插值曲面去填充這些曲線網格。

In the displacement measurement based on the principle of laser interference , the gaussian quadrics fitting algorithm is used to fix the central position of facula and raise the location accuracy 在基于兩球面波干涉的長度和距離測量實驗中,運用高斯二次曲面擬合算法為激光光斑的中心坐標定位,提高了光斑的定位精度。

Using local base surface parameterization , a parametric quadric surface approximation method is used to estimate the local surface curvature properties of scattered points based on propagating normal vector direction 首先，計算各點的鄰近點集，選取合適的局部基礎曲面，把鄰近點集投影到相應的局部基礎曲面。

A new method for determining knots to construct polynomial curves is presented . at each data point , a quadric curve which passes three consecutive points is constructed 一般認為，在滿足給定約束條件的前提下，一條曲線具有的應變能越小，則該曲線的形狀就越好。

As one of important devices that transformed the crude resource into quadric resource , the boiler ' s working status affects the using rate of resource directly 鍋爐作為將一次能源轉化為二次能源的重要設備之一，其工作情況的好壞直接影響到能源利用率的高低。

A new algorithm is presented in this paper for piecewise quadric b - splines curve reconstruction from scattered data in a plane 摘要基于控制頂點擾動的思想提出了一種新的曲線重構算法，用于構造一條分段二次b樣條曲線來逼近平面上的散亂數據點。