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gamma核
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     We introduce and improve two detection methods: the extended fractal (EF) detection and the quadratic gamma detection.
     引入并改进了两种利用目标特征进行检测的方法:EF特征检测和基于二次Gamma核的目标检测。
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  相似匹配句对
     Decommission of nuclear faclities
     设施退役
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     NUCLEON STRUCTURE
     子结构
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     Geometric Convexity of Gamma Function
     Gamma函数的几何凸性
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     Bootstraping Estimation of Parameters for Gamma Distribution
     Gamma分布的Bootstrap估计
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  gamma kernels
Probability Density Function Estimation Using Gamma Kernels
      
The gamma kernels are non-negative and have naturally varying shape.
      
The asymmetric kernels are either beta kernels if the curve has a compact support or gamma kernels if the curve is bounded from one end only.
      
While possessing the standard benefits of local linear smoothing, the local linear smoother using the beta or gamma kernels offers some extra advantages in aspects of having finite variance and resistance to sparse design.
      
Gamma kernels are designed to handle density functions whose supports are bounded from one end only, whereas beta kernels are particularly convenient for the estimation of density functions with compact support.
      
  gamma kernel
The gamma kernel estimators are free of boundary bias, non-negative and achieve the optimal rate of convergence for the mean integrated squared error.
      
The variance of the gamma kernel estimators at a distance x away from the origin is O(n-4/5x-1/2) indicating a smaller variance as x increases.
      
Finite sample comparisons with other boundary bias free kernel estimators are made via simulation to evaluate the performance of the gamma kernel estimators.
      


CFAR detector is widely used as a target detector in SAR because of its simplicity and effectiveness. However, when used in an extremely heterogeneous SAR image, it leads to a bad performance. So, a new target detector for SAR image by quadratic Gamma kernels with adaptive guard-band size is presented. This method is tested with high resolution single look single polarity SAR data. The results show that it can detect all the artificial targets with lower false alarm rate, and in the same time the detected targets...

CFAR detector is widely used as a target detector in SAR because of its simplicity and effectiveness. However, when used in an extremely heterogeneous SAR image, it leads to a bad performance. So, a new target detector for SAR image by quadratic Gamma kernels with adaptive guard-band size is presented. This method is tested with high resolution single look single polarity SAR data. The results show that it can detect all the artificial targets with lower false alarm rate, and in the same time the detected targets preserve their structure information very well.

利用二项式Gamma核进行SAR图像目标检测,并提出自适应选取扫描窗大小的方法,给出了一种基于改进的二项式Gamma核SAR图像检测方法提高二项式Gamma核检测器的性能。用于高分辨率单视单极化的极不均匀的SAR图像,能够在较小虚警率下将人造目标全部检测出来,而且能很好地保持人造目标的结构信息。实验证明所提方法的有效性。

 
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