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 delta方法
 delta method
 This correspondence firstly gives comprehensive study to fast algorithms for geometric moments, including image transform, Delta method, computation via corner points, method based on Green′s theorem and image block representation. 对规则矩快速算法了进行了综述 ,包括图像变换、Delta方法、拐点方法、Green定理法和图像块表示法。 短句来源 We investigate in this paper the previously used sequential moment computation methods,and then compare the performances of Delta method,multiple line segment integral method,and Li and Shen's Green's theorem method by digital experiments. 该文首先综述现有的对几何矩进行快速计算的顺序算法,然后用数字实验比较Delta方法、多线段积分方法、以及Li和Shen的格林定理法的性能。 短句来源 Multiple line segment integral method and Delta method are similar in the aspect of computing Hu's moment invariants. But Delta method suits only binary horizontal continuous images and multiple line segment integral method can process arbitrary binary images. 多线段积分方法和Delta方法在计算Hu矩不变量方面性能是相同的,但Delta方法仅适于处理二值水平连续图像,而多线段积分方法可以处理任意二值图像。 短句来源 The DELTA method is applied to simulate the waves generated by ships. 应用DELTA方法之数值模型于仿真分析船舶在有入射波海域航行时的流场 ,并对该运动所产生的波形加以分析。 短句来源 The DELTA Method reduces the complexitics of the program and shortens the computation time because all the singularities are placed outside of the computational domain and Cauchy intcgral is then avoided. DELTA方法的特点是将所有奇点布置于计算区域之外 ,相对于传统做法而言 ,程式的复杂度减低 ,运算过程所需的时间亦减少。 短句来源
 the delta method
 The DELTA method is applied to simulate the waves generated by ships. 应用DELTA方法之数值模型于仿真分析船舶在有入射波海域航行时的流场 ,并对该运动所产生的波形加以分析。 短句来源 The DELTA Method reduces the complexitics of the program and shortens the computation time because all the singularities are placed outside of the computational domain and Cauchy intcgral is then avoided. DELTA方法的特点是将所有奇点布置于计算区域之外 ,相对于传统做法而言 ,程式的复杂度减低 ,运算过程所需的时间亦减少。 短句来源

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 delta method
 The confidence intervals calculated with the delta method were biased downwardly. This paper provides closed-form formulae for computing the asymptotic covariance matrices of the estimated autocovariance and autocorrelation functions of stable VAR models by means of the delta method. An extension of delta method to synchronous machine transient stability study The delta method is applied to solve the transient stability problem of a synchronous machine connected to an infinite bus. In the paper the delta method is extended to this third-order nonlinear swing equation. 更多
 the delta method
 The confidence intervals calculated with the delta method were biased downwardly. This paper provides closed-form formulae for computing the asymptotic covariance matrices of the estimated autocovariance and autocorrelation functions of stable VAR models by means of the delta method. The delta method is applied to solve the transient stability problem of a synchronous machine connected to an infinite bus. In the paper the delta method is extended to this third-order nonlinear swing equation. The delta method, which is a piecewise analytical solution technique, is applied to determine the diurnal variation in plant primary production rate. 更多
 This correspondence firstly gives comprehensive study to fast algorithms for geometric moments, including image transform, Delta method, computation via corner points, method based on Green′s theorem and image block representation. Then an efficient fast algorithm for the computation of regular moment is proposed. This line segment method can give accurate result for binary images. Lastly, analysis and comparison are given for various algorithms. 对规则矩快速算法了进行了综述 ,包括图像变换、Delta方法、拐点方法、Green定理法和图像块表示法。提出了一种实用的规则矩快速算法———截线段法 ,该方法可对任意二值图像计算精确。以三个图像求解Hu的矩不变量为例 ,对各种算法进行了分析与比较。 Moment invariants have found wide applications in pattern recognition, object orientation and others The main difficulty in application of moment invariants is computation of the moment invariants: calculating the moments directly is too expensive in computation cost In this paper, a fast algorithm based on compensating principle is proposed It is considered that the computation of shape moments is summation of the contribution of each line segment Firstly, a binary shape is decomposed into line segments... Moment invariants have found wide applications in pattern recognition, object orientation and others The main difficulty in application of moment invariants is computation of the moment invariants: calculating the moments directly is too expensive in computation cost In this paper, a fast algorithm based on compensating principle is proposed It is considered that the computation of shape moments is summation of the contribution of each line segment Firstly, a binary shape is decomposed into line segments For each line segment L j , whose left end coordinate and right end coordinate are X j1 and X j2 respectively, a line segment A j is appended, whose left end coordinate and right end coordinate are 0 and X j1 -1 respectively, to line segment L j Now there are two line segment A j and B j The left end coordinate and right end coordinate of B j are 0 and X j2 respectively The moment of the line segment L j is the difference of these two line segments ( B j - A j ) The most advantage of the method is that the number of all the possibility of line segment is reduced from N 2 to N as the left end coordinate of all line segment is all zero Secondly, an array is assigned, whose size is N , and is used to store the moment of the line segment When ever calculating the moments of a line segment, it can be obtained from the array directly, so moment computation is more efficient Comparison of the computational complexity with some known methods is also given, which shows that the algorithm under discussion significantly reduces the complexity Compared with some other methods, which have the approximate result and only fit convex object, this method not only has accurate result but also can calculate any complicated object moments 由于不变矩对图像的平移放大旋转的不敏感性 ,因此在模式识别、图像分类、场景匹配等图像处理和分析领域获得越来越广泛的应用 但是 ,求矩运算过程复杂、计算量大、使它的应用受到限制 基于Delta方法 ,提出了一种新的基于补偿法则的矩的快速算法 对任意二值图像分解为多条线段 ,图像的矩就等于所有线段的矩的和 对每一线段 ,将其左方 (或上方 )填满 每一线段的矩就等于填充后的线段的矩减去填充线段的矩 这样做的好处在于 :一幅图像所有可能横 (竖 )线段的数目由N2 减少为N 引入一组N大小的数组 ,将求矩过程中大量重复计算的数据一次计算后存入数组 ,需要时查数组即得 从而极大地减少了计算量 由于填充后线段规格一致 ,便于用统一的公式计算且有利于编程 和已有的某些算法仅适用于无凹图像和矩计算结果是近似的相比 ,该算法计算结果准确 ,适用于任意复杂的二值图像 列出了已有矩算法运算量的评估 ,比较而言 ,所讨论的算法的计算量和用时都优于其他算法 Geometric moments are among the most common means of deriving invariants with respect to object translation,scale change and rotation.Direct computation of moments involves a large number of multiplications and additions,hence seeking for fast algorithm for geometric moments become a necessary.We investigate in this paper the previously used sequential moment computation methods,and then compare the performances of Delta method,multiple line segment integral method,and Li and Shen's Green's theorem method... Geometric moments are among the most common means of deriving invariants with respect to object translation,scale change and rotation.Direct computation of moments involves a large number of multiplications and additions,hence seeking for fast algorithm for geometric moments become a necessary.We investigate in this paper the previously used sequential moment computation methods,and then compare the performances of Delta method,multiple line segment integral method,and Li and Shen's Green's theorem method by digital experiments.Multiple line segment integral method and Delta method are similar in the aspect of computing Hu's moment invariants.But Delta method suits only binary horizontal continuous images and multiple line segment integral method can process arbitrary binary images.Compared with Li and Shen's Green method,multiple line segment integral method gives near perfect results in computation precision. 几何矩是用于推导平移、伸缩和旋转不变量的常用技术。用直接方法计算矩涉及大量的加法和乘法,因而有必要研究几何矩的快速算法。该文首先综述现有的对几何矩进行快速计算的顺序算法,然后用数字实验比较Delta方法、多线段积分方法、以及Li和Shen的格林定理法的性能。多线段积分方法和Delta方法在计算Hu矩不变量方面性能是相同的,但Delta方法仅适于处理二值水平连续图像,而多线段积分方法可以处理任意二值图像。与Li和Shen的格林定理法相比,多线段积分方法在计算精度上性能很完美。 << 更多相关文摘
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