查询词典 speckle

Then, based on the bifurcating points extracted from thinning image, the application of the weighted Hausdorff distance algorithm to image matching can overcome the effect of speckle noise in the synthetic aperture radar image.

同时，基于细化后提取出的分支特征点，应用加权Hausdorff距离算法进行图像匹配，克服了斑点噪声对合成孔径雷达图像匹配的影响。

DEM is necessary in the geometrical correction of non-flat area. SAR simulation is helpful to the selection of GCPs in hilled area. For high accuracy of less than one pixel, auto-registration technique was adopted. Multi-channel filtering can be carried out in an optimal way, which minimizes speckle while preserving the radiometry and spatial resolution of the individual channels.

研究表明在非平坦地区必须经过DEM 正射校正，正射校正时利用DEM 模拟雷达影像有助于山区控制点的选择；利用多参数雷达合成影像时，影像间的配准十分重要，利用自动配准技术不仅配准精度高，而且自动化程度高；文中采用多通道滤波方法对多时相合成的ASAR影像进行斑点噪声的去除，很好地保持了图像的辐射特性和空间分辨率。

In this study, twist mechanics were quantitated in 150 children with a mean BMI of 18.2 by two-dimensional speckle-tracking imaging of the LV base and apex in short axis.

在这项研究中，150名平均体重指数为18.2的儿童通过二维斑点追踪技术测量短轴心尖和基底部的扭转运动。

When a coherent light is scattered by the rough surface, the scatted light forms a granular intensity distribution known as speckle. Speckles are coherent superposition of the light scatted by the rough surface. Therefore, speckles carrier some information of the rough surface.

相干光从光学粗糙表面散射时，结果在探测面上出现随机的颗粒状的强度分布，称为散斑，散斑是由粗糙表面上各面元的散射光波之间的干涉在空间域内形成的，所以散斑也是粗糙表面一些信息的携带者。

The experimental result shows that eEndoscope-based speckle quasi-confocal system has the quality of axial optical sectioning.

实验结果表明内窥式散斑类共聚焦系统具有很好的轴向层析能力。

The analytical expressions of the speckle number subtended by the receiving aperture are derived for the circular and rectangular receiving apertures, respectively.

从理论角度导出了系统所探测的光电子数所满足的分布，并给出了系统探测概率的理论表达式。

A differential demodulation system of Laser Doppler is designed. Phase grating is adopt to obtain same intensity measured beams with big separative angle in the system,and by focusing the waists of two Gauss beams on the measured object with extender and collimating lens group, the smallest speckle and the superposition of plane waves are obtained.

设计了一种差动检波系统，采用相位光栅获得同光强、大夹角的测量光束，用扩束准直透镜组使两束高斯光束的束腰聚焦在被测物体上，得到最小光斑和平面波的叠加。

By measuring total area of the target image and the area and perimeter of each image speckle of the target image,the distributing rule and density of the target image can be found.

通过对图像进行灰度处理和二值化处理，提取目标图像及其边界，并测量所提取目标图像的总面积及目标图像各斑块的面积和周长，由此研究其分布规律与分布密度，并在测量的基础上对目标图像斑块进行统计，得到一定面积或周长范围内目标图像斑块的个数，为相应的研究提供定量分析。

Experiment results indicate that the laser speckle method is effective, its measuring value is about 14% less than the measuring value of dial gauge.

结果表明，激光散斑法用于测定闭合断续节理岩体的位移场效果良好，其测值比对应点千分表测值偏小14％左右。

Self-Mixing Speckle and Dynamic Target Distance Measurement Using Erbium-Doped Fiber Ring Laser.

作者简介韩道福|副教授|主要从事光电子技术与激光应用等方面的研究|(1974-)，男，博士。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。