查询词典 speckle

Experimental results demonstrate that the proposed method can effectively suppress speckle noise, while preserving the edge and texture information.

实验结果表明，该方法可以有效地抑制相干斑噪声，同时很好的保持边缘纹理信息。

The presence of speckle is a major cause of degradation in SAR images.

摘要相干斑噪声是引起SAR图像降质的主要原因之一。

A new experimental method for measuring resonant frequencies of objects is proposed by use of rotating shearing stroboscopic speckle interferome-try.

利用散斑干涉技术可对物体的动态过程和振动进行测量，由于测量的精度、灵敏度都较高，因而获得了较广泛的应用。

The influences of optical feedback and external cavity length on the laser output are studied, and the relation between fluctuations of speckle signal and the transverse velocity of rough surface is discussed.

分析了随机变化的反馈强度与外腔长度对激光光谱特性的影响。

Currently, the effectiveness based on the methods of the IVUS image edge detection is not ideal because of the severe speckle noise and some unadvisable priori hypotheses.

目前，所提出的IVUS图像边缘提取方法由于严重的斑点噪声影响以及加入了一些不适当的先验假设，边缘提取的效果并不理想。

It is found that the digital speckle images have fractal characteristics, and there is correlation between the characteristics of undeformed and deformed states.

本文研究发现数字散斑图具有分形特征，变形前后的数字散斑图像之间的分形特征也具有相关性。

In order to design a high performance laser Doppler velocimeter, the relationship between the signal intensity of laser Doppler and the diameter of spot was analyzed using the speckle theory, and the calculation formulas of the Doppler current was given based on functional theory. The polarization characteristic of scattered light and its intensity distribution were investigated.

为了设计高性能的激光多普勒测速仪，运用散斑理论详细分析了激光多普勒信号的强度与散射光斑大小的关系，结合泛函理论给出了计算多普勒电流的散斑表达式，并通过实验的方法研究了回波信号的偏振特性及其强度分布。

The symptom is whiten speckle, which has a serious effect on their edible value and commercial value.

主要症状是果梗和果粒表面出现漂白斑，严重影响葡萄的商品价值和食用价值。

In feature-level case, fully polarization information from SAR is used to combine with spectral characteristic from SPOT images, mainly to enhance land cover classification as well. Speckle noise was removed by Lee filter, followed by the maximum likelihood classifier based on different distribution was used for SAR and SPOT images (Based on Wishart distribution and multivariate Gaussian distribution respectively), to extract the conditional probability of each pixel for each class.

首先使用李式滤波器滤除全偏极雷达资料杂讯，接下来同样是使用採用最大似然法来分类融合影像，(不同的在於全偏极雷达影像使用Wishart机率分布，在光学影像採用multivariateGaussian机率分布)將每个类别中每个像元属於某个类别的机率值计算出来，再利用Dempster-Shafer evidence theory来结合这些类别的机率值。

Because two shearing object beams travel in the same direction when Wollaston prism is used as image-shearing device in traditional speckle shearing interferometry.

在沃拉斯顿棱镜作为剪切器件的传统剪切散斑干涉术中，由于错位的二物光束同光路传播，很难通过将它们分开来引入附加相位的方法实现相移。

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。