Description: 一篇西安电子科技大学的硕士论文，讨论了各种空时编码技术的设计准则和编译码方案，分析了不需要信道状态信息的差分酉空时编码调制技术，给出了仿真结果。-Xidian University, a master s thesis, discussed a wide range of space-time coding technology, design criteria and codec programs analyzed do not need to channel state information of Differential Unitary Space-Time code modulation technology, the simulation results. Platform: |
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Author:fisher |
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Description: 在图象中，边缘是由灰度级和相邻域点不同的象素点构成的。因而，若想增强边缘，就应该突出相邻点间的灰度级的变化。微分运算可用来求信号的变化率，因而具有加强高频分量的作用。如果将其应用在图象上，可使图象的轮廓清晰。由于我们常常无法事先确定轮廓的取向，因而挑选用于轮廓增强的微分算子时，必须选择那些不具备空间方向性的和具有旋转不变的线形微分算子。-In the image, the edge is adjacent to the gray-scale and different domains consisting of the pixel points. Thus, if the edge enhancement, it should highlight the points between adjacent gray-scale changes. Differential operator can be used to signal changes in the rate of demand and thus to strengthen the role of high-frequency component. If the images on their application, will enable a clear outline of the image. Since we often can not be pre-determined orientation of the outline, so the selection for the differential operator to enhance the outline of midnight, to choose those who do not have the space and the direction of rotation-invariant linear differential operator. Platform: |
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Author:宇航 |
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Description: 图像的平面微分平方和能够反映图像高频分
量的能量。用计算平面微分平方和的方法在空间域上计算相邻像素亮度差值的平方和，对应于在频率域上计算图像高频分量的能量和，此值越大，图像对焦越准确-Differential square image plane and the image can reflect the energy of high frequency. Computational method of Planar Differential squares calculated in the space domain to the square of the difference between the brightness of adjacent pixels and corresponds to the image in the frequency domain calculation of high frequency energy and, this value is larger, the more accurate the image focus Platform: |
Size: 2048 |
Author:焦慧娟 |
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Description: 在图象中，边缘是由灰度级和相邻域点不同的象素点构成的。因而，若想增强边缘，就应该突出相邻点间的灰度级的变化。微分运算可用来求信号的变化率，因而具有加强高频分量的作用。如如果将其应用在图象上，可使图象的轮廓清晰。由于我们常常无法事先确定轮廓的取向，因而挑选用于轮廓增强的微分算子时，必须选择那些不具备空间方向性的和具有旋转不变的线形微分算子。
-In the image, the edge is constituted by the pixel dots of different gray level and an adjacent domain points. Thus, if you want to enhance edges, it should be highlighted the gray level changes between adjacent points. The differential operator is used to find the rate of change of the signal, which has the role of strengthening the high-frequency component. If its application in the image on the outline of the image can be clear. Often not possible to determine the orientation of the contour, and thus the selection differential operator midnight, you must select those who do not have the space directional rotation invariant linear differential operator for edge enhancement. Platform: |
Size: 1024 |
Author:粘附 |
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Description: Numerical solution of differential equations method, You can get a very accurate amplitude, frequency, phase estimation, Space target recognition algorithm using PM. Platform: |
Size: 58368 |
Author:李增
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Description: For time-frequency analysis algorithm, Using a large number of finite element method to solve partial differential equations, Space target recognition algorithm using PM. Platform: |
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Author:qbueujp
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Description: 边缘检测算子
图像边缘信息主要集中在高频段，通常说图像锐化或检测边缘，实质就是高频滤波。我们知道微分运算是求信号的变化率，具有加强高频分量的作用。在空域运算中来说，对图像的锐化就是计算微分。由于数字图像的离散信号，微分运算就变成计算差分或梯度。图像处理中有多种边缘检测（梯度）算子，常用的包括普通一阶差分，Robert算子（交叉差分），Sobel算子等等，是基于寻找梯度强度。拉普拉斯算子（二阶差分）是基于过零点检测。通过计算梯度，设置阀值，得到边缘图像。(The image edge information is mainly concentrated in the high frequency section, usually the image sharpening or detecting the edge, the essence is the high frequency filtering. We know that differential operation is the change rate of the signal, and it has the function of strengthening the high frequency component. In the space operation, the sharpening of the image is the calculation of differential. Because of the discrete signal of the digital image, the differential operation becomes the difference or the gradient. There are many edge detection (gradient) operators in image processing, which usually include ordinary first order difference, Robert operator (cross difference), Sobel operator and so on, which are based on finding gradient intensity. The Laplasse operator (two order difference) is based on the zero crossing point detection. By calculating the gradient, the threshold is set to get the edge image.) Platform: |
Size: 22621184 |
Author:lohaspig |
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Description: 对电力系统小干扰稳定性进行分析的方法大致可以分为以下几种：数值仿真方法、建立在线性模型基础上的分析方法、小干扰稳定域分析方法、非线性理论分析方法和计及模型不确定性的分析方法。对小干扰稳定性问题可以采用线性模型进行研究，这种线性模型是将描述系统动态行为的微分方程和代数方程在稳态运行点处线性化后得到的。目前，建立在线性模型基础上的电力系统小干扰稳定性分析方法主要有两种：以状态空间模型描述为基础的特征值分析法和以传递函数矩阵为基础的频域分析法。本文采用全部特征值分析法（QR 法）对9节点系统在稳态处进行小干扰稳定分析。(The analysis methods of power system small disturbance stability can be roughly divided into the following: numerical simulation method, analysis method based on linear model, small disturbance stability region analysis method, nonlinear theoretical analysis method and analysis method considering model uncertainty. A linear model can be used to study the stability of small disturbance. The linear model is obtained by linearizing the differential equation and algebraic equation describing the dynamic behavior of the system at the stable operation point. At present, there are two main methods of power system small disturbance stability analysis based on linear model: eigenvalue analysis based on state space model description and frequency domain analysis based on transfer function matrix. In this paper, the QR method is used to analyze the stability of 9-node system at steady state.) Platform: |
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Author:曰曰 |
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Search - differential space-frequency