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coherence enhancement
相关语句
  “coherence enhancement”译为未确定词的双语例句
     Coherence enhancement of spatially incoherent light beams through soliton interaction in logarithmically saturable nonlinear media
     饱和对数非线性介质中非相干孤子碰撞对相干性的改善
短句来源
     Since forward and backward diffusion cannot hold flow-like edges,and coherence enhancement diffusion cannot sharpen edges,a new edge-directed nonlinear diffusion equation to enhance image is put forward.
     针对前向后向扩散方程不能较好的保持流线状结构,而相干增强不能锐化边缘的缺点,提出一种新的基于边缘定向的张量型前向后向扩散模型.
短句来源
     The new model adapts an operator like coherence enhancement diffusion for edge orientation,and defines eigenvalues based on edge′s orientation such that the new tensor has positive diffusion coefficient in edge direction and negative diffusion coefficient in gradient direction.
     采用类似相干增强扩散的边缘定向算子实现对边缘的定向,然后根据边缘定向的结果设置扩散张量的特征根,使扩散张量沿边缘方向为正向扩散以增强边缘,而垂直于边缘方向为逆扩散以锐化边缘.
短句来源
  相似匹配句对
     An Improved Coherence Diffusion Method for Image Enhancement
     一种改进的一致性扩散图像增强方法
短句来源
     IMAGE ENHANCEMENT OF COHERENCE CUBE BASED ON COHERENT FILTERING
     基于相干滤波的相干体图像增强
短句来源
     Coherence and Translation
     连贯与翻译探索
短句来源
     Cohesion and Coherence
     衔接与连贯(英文)
短句来源
     The enhancement of design
     设计层次的提升
短句来源
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  coherence enhancement
The scattered light from the tubes is analyzed and the coherence enhancement of the fringe structure is shown.
      
A Self-Coherence Enhancement Algorithm and its Application to Enhancing Three-Dimensional Source Estimation from EEGs
      
The relaxation in the sc state was slower at all temperatures without the coherence enhancement close to Tc.
      
Real-time speckle reduction qnd coherence enhancement in ultrasound imaging via nonlinear anisotropic diffusion.
      


This paper systematically expounds seismic secondary noises generated by all kinds of surface obstacles and points out that such noises are most noteworthy in seismic prospeeting. The complexity of surface secondary noises lies in the following five aspects: (1)The secondary noises may occur on the whole record and they can be neither avoided nor removed. (2)The frequency band of the surface secondary noises is nearly the same as that of effective reflection, so they can not be eliminated by frequency filtering....

This paper systematically expounds seismic secondary noises generated by all kinds of surface obstacles and points out that such noises are most noteworthy in seismic prospeeting. The complexity of surface secondary noises lies in the following five aspects: (1)The secondary noises may occur on the whole record and they can be neither avoided nor removed. (2)The frequency band of the surface secondary noises is nearly the same as that of effective reflection, so they can not be eliminated by frequency filtering. (3)Low-velocity secondary noise often behaves as random noise. The random noise is generally suppressed by statistical method, whose suppressing ability, however, is limited. (4) The secondary noises reach seismic spread from all directions, therefore their apparent velocities on a record are often very high, the highest approaching infinity as a limit. The high-velocity secondary noise from the side is so similar to the effective reflection that they can hardly be distinguished from each other, some high velocity secondary noises can even be enhanced by stacking; (5) Because the apparent velocity of high velocity secondary noise is generally higher than that of refraction first arrival, the high velocity secondary noise often can not be distinguished from effective reflection in apparent velocity domain and apparent wavelength domain. The high velocity secondary noise can not be all eliminated by field geophone array method, it can only be treated in data processing. The one-sidedness of noise investigation methods stated in traditional text books of seismology is pointed out in this paper.Generally, the high velocity secondary noise can hardly, be found on noise investigation records, on the contrary, it can be found clear on production records and horizontal stacking sections. Areal geophone array is the most effective method for suppressing high velocity secondary noise. This paper also shows clearly that linear array has incorrigible defect, makes a concrete account of all kinds of areal geophone array and emphasizes that rose analysis should be used to direct the application of geophone array. This paper refers to the common demerits in current seismic data processing. It is suggested that the effort for suppressing noise in data processing should not be placed only on a single seismic trace. Furthermore, it is pointed out that mixing, 2-D filtering and coherence enhancement etc. are the effective methods for eliminating secondary noises. However, the technique for full eliminating secondary noises is being expected. A method for processing low S/N ratio seismic data is presented in this paper.

本文系统论述了由地表各种障碍物(不均匀体)所次生激发的地震干扰波,并指出它是地震勘探中最值得注意的干扰波。次生干扰的复杂性在于:(1)次生干扰可以分布于全记录,无法躲开,也不能切除。(2)它与有效反射波几乎有相同的频带范围,无法用频率滤波滤去。(3)次生低速干扰常常表现为“随机性”,而克服随机干扰一般采用的是统计法,但统计法克服干扰的本领总是很有限的。(4)次生干扰可以从四面八方传到排列,因此在记录上的视速度常常很高,最高可接近无穷大。侧面次生高速干扰可以与反射有效波十分相象,真假难分。有些次生高速干扰甚至在叠加时会得到加强。(5)由于次生高速干扰的视速度普遍高于折射初至波的速度,因此与反射有效波在视速度域及视波长域总是难解难分,不可能在野外组合中把次生干扰去除干净,只能留给室内处理。本文又指出了传统的地震教科书中论述干扰波调查方法的片面性。次生高速干扰往往在干扰波调查记录上不易被发现。相反地在生产记录及水平叠加剖面上却清晰可见。文中指出,克服次生干扰波最有效的方法是面积组合,直线组合会带来不可弥补的缺陷,并对面积组合的各种形式作了具体介绍,强调用玫瑰图的分析方法指导组合实践。在处理过程中,克服干扰波不能只在...

本文系统论述了由地表各种障碍物(不均匀体)所次生激发的地震干扰波,并指出它是地震勘探中最值得注意的干扰波。次生干扰的复杂性在于:(1)次生干扰可以分布于全记录,无法躲开,也不能切除。(2)它与有效反射波几乎有相同的频带范围,无法用频率滤波滤去。(3)次生低速干扰常常表现为“随机性”,而克服随机干扰一般采用的是统计法,但统计法克服干扰的本领总是很有限的。(4)次生干扰可以从四面八方传到排列,因此在记录上的视速度常常很高,最高可接近无穷大。侧面次生高速干扰可以与反射有效波十分相象,真假难分。有些次生高速干扰甚至在叠加时会得到加强。(5)由于次生高速干扰的视速度普遍高于折射初至波的速度,因此与反射有效波在视速度域及视波长域总是难解难分,不可能在野外组合中把次生干扰去除干净,只能留给室内处理。本文又指出了传统的地震教科书中论述干扰波调查方法的片面性。次生高速干扰往往在干扰波调查记录上不易被发现。相反地在生产记录及水平叠加剖面上却清晰可见。文中指出,克服次生干扰波最有效的方法是面积组合,直线组合会带来不可弥补的缺陷,并对面积组合的各种形式作了具体介绍,强调用玫瑰图的分析方法指导组合实践。在处理过程中,克服干扰波不能只在一个地震道上做文章。文中指出目前地震资料处理中的通病,并认为混波、二维滤波及相干加强等方法是克服各种次生干扰波有效的方法。目前,进一步从记录中彻底消除干扰波的技术尚待研究完善。本文初步提出了低信噪比地震资料的处理方法。

Using matrix equation, the population distribution and absorption characteristics in the molecular Y-type energy level system with two driving fields are calculated and analyzed. The generation of double dark resonance and double electromagnatically induced transparency in this energy level system is obtained, its physical mechanism is discussed. The effect of the quantum interference of the spontaneous emission on the electromagnetically induced transparency are also discussed. Coherence cancellation of the...

Using matrix equation, the population distribution and absorption characteristics in the molecular Y-type energy level system with two driving fields are calculated and analyzed. The generation of double dark resonance and double electromagnatically induced transparency in this energy level system is obtained, its physical mechanism is discussed. The effect of the quantum interference of the spontaneous emission on the electromagnetically induced transparency are also discussed. Coherence cancellation of the spontaneous emission can form the ultra-narrow line width and enhance the absorption, whereas the coherence enhancement of the spontaneous emission can form the wide absorption line width and weaken its intensity, above calculated results are analyzed with the dressed state theory and agree with those by the density matrix equation.

采用密度矩阵方程 ,对双光场耦合的分子Y型四能级系统的粒子数分布和吸收特性进行了计算和分析 ,在此能级系统中得到了双暗态共振和双电磁感应透明 ,并讨论了相应的物理机制。同时 ,我们讨论了Y型四能级两个上能级的自发辐射产生的量子干涉效应对电磁感应透明的影响 ,发现自发辐射干涉相消可以产生超窄线宽和导致探测光的吸收增强 ,自发辐射干涉相长可以展宽谱线和减弱探测光的吸收 ,并运用缀饰态理论对以上计算结果进行分析 ,与采用密度矩阵方程的计算结果一致

Since forward and backward diffusion cannot hold flow-like edges,and coherence enhancement diffusion cannot sharpen edges,a new edge-directed nonlinear diffusion equation to enhance image is put forward.The new model introduces forward and backward diffusion to the tensor diffusion,and gets a new diffusivity,which combines the merits of these two methods.The new model adapts an operator like coherence enhancement diffusion for edge orientation,and defines eigenvalues based on edge′s orientation such...

Since forward and backward diffusion cannot hold flow-like edges,and coherence enhancement diffusion cannot sharpen edges,a new edge-directed nonlinear diffusion equation to enhance image is put forward.The new model introduces forward and backward diffusion to the tensor diffusion,and gets a new diffusivity,which combines the merits of these two methods.The new model adapts an operator like coherence enhancement diffusion for edge orientation,and defines eigenvalues based on edge′s orientation such that the new tensor has positive diffusion coefficient in edge direction and negative diffusion coefficient in gradient direction.Both theory analysis and numerical results show that the new model has better enhancement result than coherence enhancing diffusion and forward and backward diffusion.

针对前向后向扩散方程不能较好的保持流线状结构,而相干增强不能锐化边缘的缺点,提出一种新的基于边缘定向的张量型前向后向扩散模型.该模型将前向-后向扩散方程引进到张量型扩散方程中,在扩散系数的选取上合并了相干增强扩散与前向-后向扩散的长处,又克服了他们各自的缺点.采用类似相干增强扩散的边缘定向算子实现对边缘的定向,然后根据边缘定向的结果设置扩散张量的特征根,使扩散张量沿边缘方向为正向扩散以增强边缘,而垂直于边缘方向为逆扩散以锐化边缘.理论分析和数值计算表明,该方法具有比相干增强扩散及前向-后向扩散更好的增强效果.

 
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