点变换

This technique makes it possible to reproduce a three-dimensional stereo by getting fundamental matrix through matching pixels. But it is the most difficult problem to be solved completely.

本文对立体匹配的相关理论与算法进行了细致的研究，采用小波变换提取图像突变特征点的方法，并与传统采用的角点方法在性能上作了一些比较。

Results indicate that:(1) by using HANTS, the researchers could get the EVI/NDVI harmonic curves, the mean VIs and the amplitude of the harmonics which then were utilized in the identification of the cultivated land, and EVI appeared to be more precise, with the overall accuracies of 97.17% and 95.99% and Kappa coefficients of 0.7938 and 0.6518, respectively.(2) Multiple cropping index was extracted by counting the number of the curve's peak; and when the threshold of the peak value of the NDVI and EVI curves were set as 0.25 and 0.20, respectively, the fallow land could be well figured out.(3) From harmonic curves, some eigenvalues, such as time of the maximum growth rate, time of peak and the value of peak can be extracted, based on which the crop types can be primarily distinguished. And EVI still performed better than NDVI in this section.

结果显示：（1）利用傅立叶谐波变换得到的EVI和NDVI时间谱曲线的谐波余项及谐波振幅对耕地进行识别，从识别精度来看，EVI要优于NDVI，识别精度分别为97.17%和 95.99%，Kappa系数分别达到0.7938和0.6518；（2）通过计算时间序列曲线的波峰数能够提取耕地的复种指数，并且在EVI和NDVI曲线波峰阈值分别设为0.20和0.25时，休耕地能较为准确地被识别出来；（3）通过提取作物生长期内曲线的VI最大增长速率时间点以及峰值时间点等信息，作物种类能被初步识别，并且EVI较NDVI具有更强的识别能力。

The phase message of interference pattern was obtained by the Fourier transform pattern analysis method.

基于傅里叶变换的点衍射干涉测量术是一种建立在点光源衍射干涉理论基础上的测量方法。

In the experiment the pre-processings, such as image filtering and Harris operator corner detector, etc. were used to get feature points quickly and realize the mapping transformation of camera parameters. The error estimate function was established to compare the proposed method with Tsai calibration algorithm.

实验过程中，利用图像降噪、改进的Harris算子角点提取等预处理过程快速提取特征点，实现摄像机参数标定的映射变换；建立了误差评价函数评价本文方法与Tsai标定算法。

In the experiment the preprocessings, such as image filtering and Harris operator corner detector, etc., were used to get feature points quickly and realize the mapping transformation of camera parameters. The error estimate function was established to compare the proposed method with Tsai calibration algorithm.

实验过程中，利用图像降噪、改进的Harris算子角点提取等预处理过程快速提取特征点，实现摄像机参数标定的映射变换；建立了误差评价函数评价本文方法与Tsai标定算法。

This paper proposes one set of leakage point location system based on the correlation analysis, through the virtual instrument technology. We choose the water sound signals as the studying object when the pipelines leak out, carry out the orientation task via the Fast Fourier Transform.

本文采用虚拟仪器技术，设计了一套基于相关分析算法的管道漏点定位系统，即选择管道泄漏时产生的、在管道中传播的声发射信号为研究对象，通过基于快速傅立叶变换(FFT，Fast Fourier Transformation)算法的相关分析来实现漏点的检测与定位。

Methods A middleaged male frozen specimen sectional images of the head and neck were acquired using cryosectiome method. With the software of Matlab, the character of the excalibrator was acquired automatically, and the data set were autoregistrated based on two point projective transformation algorithm.

方法采用冰冻铣切技术获取成年男性头颈标本的冰冻连续断层图像，在Matlab软件中自动提取定标点图像特征，采用基于2点的刚体变换算法实现图像的自动配准。

In view of the inclining error in installing to the work-piece in lapping, an analytic method for profile error is presented, new and old rectangular coordinates are established, and error model of work-piece between its actual and ideal curve is deduced through coordinate transform.

针对研磨中工件的安装倾斜误差，提出了导致工件面形误差的分析方法，建立新、原坐标系，应用坐标变换，推导出工件曲线上各点相对理想曲线对应点的误差模型。

Compared with the boundary element method based NAH, the variable interpolation, the numerical calculation and the disposal of singular integral are avoided in this method.

提出了以分布源边界点法作为声场的全息变换算法，建立了基于分布源边界点法的声全息重建和预测的数学模型。

Furthermore, a optimization model is established to get a necessary and suff icient condition. The arithemetic of the second questino fits the third question as well.

对于第二题，本文发现坐标变换时各点之间的欧氏距离不变，利用各点的距离关系，给出一系列的判定条件，最后用优化算法判定。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。