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斑点噪声     
相关语句
  speckle noise
     Study on the application of speckle noise filtering methods in SAR images
     SAR图像斑点噪声滤除方法应用研究
短句来源
     According to the sources of speckle noises,different methods for speckle noise suppression,including Lee filtering,Gamma MAP filtering,Frost filtering,were analyzed and compared.
     根据斑点噪声的来源,分析和比较了抑制SAR图像斑点噪声的Lee滤波、Gamma MAP滤波、Frost滤波算法,并用台湾地区的SAR图像数据验证了不同滤波算法对斑点噪声的抑制效果.
短句来源
     Study of Software-Methods of Filtering SAR Speckle Noise
     SAR斑点噪声滤除软件化方法研究
短句来源
     Research on the algorithm of suppressing speckle noise on SAR images
     SAR图像斑点噪声消除算法的研究
短句来源
     Research on Method and Application of Speckle Noise Reduction of SAR Image
     SAR图像斑点噪声抑制方法与应用研究
短句来源
更多       
  speckle
     Study on the application of speckle noise filtering methods in SAR images
     SAR图像斑点噪声滤除方法应用研究
短句来源
     According to the sources of speckle noises,different methods for speckle noise suppression,including Lee filtering,Gamma MAP filtering,Frost filtering,were analyzed and compared.
     根据斑点噪声的来源,分析和比较了抑制SAR图像斑点噪声的Lee滤波、Gamma MAP滤波、Frost滤波算法,并用台湾地区的SAR图像数据验证了不同滤波算法对斑点噪声的抑制效果.
短句来源
     Study of Software-Methods of Filtering SAR Speckle Noise
     SAR斑点噪声滤除软件化方法研究
短句来源
     Research on the algorithm of suppressing speckle noise on SAR images
     SAR图像斑点噪声消除算法的研究
短句来源
     Research on Method and Application of Speckle Noise Reduction of SAR Image
     SAR图像斑点噪声抑制方法与应用研究
短句来源
更多       
  speckle noises
     According to the sources of speckle noises,different methods for speckle noise suppression,including Lee filtering,Gamma MAP filtering,Frost filtering,were analyzed and compared.
     根据斑点噪声的来源,分析和比较了抑制SAR图像斑点噪声的Lee滤波、Gamma MAP滤波、Frost滤波算法,并用台湾地区的SAR图像数据验证了不同滤波算法对斑点噪声的抑制效果.
短句来源
     Removing the speckle noises in beef image using an improved adaptive fuzzy multilevel median filter algorithm
     采用改进的自适应模糊多级中值滤波算法去除牛肉图像斑点噪声
短句来源
     The speckle noises of SAR images make the image-interpretation complicated, and deteriorate the effectiveness of classification and information extraction procedures.
     SAR图像斑点噪声使图像解译变得复杂,并降低了图像分类和信息提取的有效性。
     However, due to speckle noises, weak edges and tissue related textures in ultrasound images, the conventional active contour models usually can not obtain satisfying contour tracking results.
     但将这一模型应用于超声图像的分割和目标轮廓的跟踪时 ,由于超声图像不可避免地存在着斑点噪声、弱边界和与组织有关的纹理 ,往往使传统主动轮廓模型难以获得满意的轮廓跟踪效果 .
短句来源
     The main reason is that the resolution and contrast degree of the ultrasonic image itself is very low as well as the influence of intrinsic speckle noises.
     其原因主要是超声图像本身分辨率、对比度较低,以及固有的斑点噪声的影响。
短句来源
更多       
  spot noise
     2, Basing on the analysis of the spot noise on the ASAR image, After comparing the filter effects between several general noise wave filters, strain have made a kind of relative school after wave effect flexible vague is subordinate to degree since suit to strain wave algorithm, have reached the needs of actual application.
     2、通过分析ASAR图像的斑点噪声特征,比较分析了几种通用的噪声滤波器的滤波效果,构建了达到实际应用要求的模糊隶属度自适应滤波新算法。
短句来源
     The experiment indicated that gauss noise and spot noise may be removed effectively using the method,and the detail of image may be saved commendably,achieved with hardware expediently.
     实验表明,该算法能有效滤除图像中的高斯噪声和斑点噪声,同时能很好地保持图像中的细节部分且比较容易用硬件实现。
短句来源

 

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      speckle noise
    However, a relatively high level of speckle noise in the difference image is caused by the spatial filtering with a small aperture (laser beam) in the minimum of the superposition field in the Fourier hologram plane.
          
    This paper studies Synthetic Aperture Radar (SAR) images contaminated by the coherent speckle noise with the multiresolution analysis of wavelet transform.
          
    It shows that this denoising method of wavelet analysis offers a very attractive alternative to suppress the coherent speckle noise of the SAR image.
          
    The results show that the technique effectively reduces the speckle noise while preserving and enhancing the tissue edge and resolvable details.
          
    An approach to suppress speckle noise and enhance edge
          
    更多          
      speckle
    We found a new structure named solicitation speckle at the low latitude of the animal pole and near the micropylar apparatus between the ovum envelope and cell membrane in the zygote of fish.
          
    The solicitation speckle similar to type I cortical alveoli was very purple in H.E.
          
    Moreover, no membrane around the solicitation speckle in TEM was found.
          
    In SEM, the solicitation speckle looked flocculent.
          
    During cortical reaction, the solicitation speckle played a very important function in arousing cortical reaction.
          
    更多          
      speckle noises
    Contact and noncontact results are compared with theoretical natural frequency values, which show that laser results were "noisier" due to dropout from speckle noises.
          
    On the other hand, SAR images may have speckle noises because of the nature of the radar imagery.
          
      spot noise
    The spot noise at 10 Hz is dominated by a gain dependent component, indicating that the main noise contribution comes from fluctuations at the input of the transistor.
          
    The analysis investigates the contribution of non-white gate-induced noise to the output noise power as well as the spot noise figure (NF) of the RF CMOS mixer.
          
    The best narrow-band spot noise temperature of the receiver is 28 K (DSB) at 133 GHz.
          
    A spot noise figure of 6.8 dB is measured at 5-MHz baseband signal frequency.
          
    A spot noise figure of 2.8 dB is also measured at the output of the filter.
          
    更多          


    Synthehc Aperture Radar (SAR) images are usually corrupted by speckle noise. In order to suppress the speclde noise and improve interpretation of the radar images, smoothing filters have been proposed in the literature. Among them, the most popular are used. Several types of filters are: the average filter, the median filter, the Frost adaptive filter, the tee adaptive filter. Recently, Rao et al. (1995) proposed a new method called the modified K-value adaptive filter. This paper is an intercomparison study...

    Synthehc Aperture Radar (SAR) images are usually corrupted by speckle noise. In order to suppress the speclde noise and improve interpretation of the radar images, smoothing filters have been proposed in the literature. Among them, the most popular are used. Several types of filters are: the average filter, the median filter, the Frost adaptive filter, the tee adaptive filter. Recently, Rao et al. (1995) proposed a new method called the modified K-value adaptive filter. This paper is an intercomparison study of these filters using ERS-1 SAR data of the Washita area in Okalahoma, United States acquired on June 10,1992. Summaries of these filters are given. Results of applying these filters to the data are evaluated with two quantitative measures. Based on the intercomparison, the most appropriate filter of SAR image speckle noise in this study was the modified K-value adaptive filter.

    星载(SAR)图象一般都存在相干斑点噪声,严重干扰地物信息的提取与SAR图象的应用效果,因此斑点噪声的消除问题引起微波遥感科技工作者的普遍关注,先后有多位学者提出各种不同的处理方法,其中最为常用的有均值平滑滤波、中值平滑滤波、Frost自适应滤波、Lee自适应滤波以及近期由P.V.NarasimhaRao等人提出的改良K-均值自适应滤波等方法。本文分析了这几种方法的数学基础,并选择了有代表性的实验区开展对比试验,结果表明:改良K-均值自适应滤波法效果最佳。

    peckle noise, which originates physically from coherent interference of back-scattered electromagnetic radiation from the multiple scattering elements in a ground illumination cell, makes the radiometric and textural aspects less efficient for application of SAR image. In order to average speckle in the homogeneous areas, preserve edges and linear features, many adaptive filters are analyzed in this paper.A new modified adaptive filter-all direction enhancement adaptive filter are developed in which the (2N...

    peckle noise, which originates physically from coherent interference of back-scattered electromagnetic radiation from the multiple scattering elements in a ground illumination cell, makes the radiometric and textural aspects less efficient for application of SAR image. In order to average speckle in the homogeneous areas, preserve edges and linear features, many adaptive filters are analyzed in this paper.A new modified adaptive filter-all direction enhancement adaptive filter are developed in which the (2N *2N) sliding window is divided into 4N subwindows, and the filter works according to the local coefficient of variation of the subwindows. The experiment results indicated that the modified filter performs better than the older ones. It reduces speckles and preserve structural features, edges and small details in all directions in the meanwhile.

    合成孔径雷达图象的斑点噪声是由于合成孔径雷达(SAR)发射的相干干涉波产生的,它严重地影响了合成孔径雷达图象的质量和应用。为了更好地平滑噪声,保护边界和纹理信息,本文在分析和实现适应于SAR图象的各种局域自适应滤波器的基础上,实现了一种新的改进的全方向增强的局域自适应滤波器。它是把(2N+1)(2N+1)的滤波子窗口分成4N个子窗口,根据不同的子窗口中的局域变化系数来进行滤波。结果表明,这种全方向增强的局域自适应滤波器在保护地物的辐射特性和图象的纹理信息以及增强图象的微细节等方面,均比以前的滤波器有较大的提高。

    The paper discusses the characteristics of oil slicks caused by hydrocarbon seepage of natural submarine oil and gas deposits,and the effect of sea surface short gravity wave and the modulation of back scattering coefficient σ° resulting from sea surface oil slicks.The characteristics of oil slicks in SAR images and the methods of image processing to reduce the radar speckle noise and enhance the oil slicks′ characteristics are presented.At last,the authors point out the feasibility of sea surface oil slick...

    The paper discusses the characteristics of oil slicks caused by hydrocarbon seepage of natural submarine oil and gas deposits,and the effect of sea surface short gravity wave and the modulation of back scattering coefficient σ° resulting from sea surface oil slicks.The characteristics of oil slicks in SAR images and the methods of image processing to reduce the radar speckle noise and enhance the oil slicks′ characteristics are presented.At last,the authors point out the feasibility of sea surface oil slick detection using SAR images and try to establish the detecting evidences of sea surface oil slicks aroused by hydrocarbon seepage.

    论述了海洋油气藏烃类渗漏在海洋表面形成的浮油膜特征,并讨论了海面油膜的存在对海面短重力波的影响和海洋合成孔径雷达(SAR)图像的后向散射系数σ°的调制,及油膜在SAR图像上的特征,探讨了对SAR图像进行处理以降低雷达斑点噪声,增强图像上油膜特征的方法。指出了SAR图像用于检测海面油膜的可行性。试图建立利用SAR图像检测海洋油气藏烃类渗漏形成的海面油膜的依据。

     
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