建立合于云南地区的速度结构模型,对云南数字地震台网记录的2000年姚安MS6.5地震3.0≤ML<5.0余震的垂直分量进行频率域内的地震矩张量反演。结果表明:矩张量分解得到纯膨胀(各向同性)分量P、纯剪切(双力偶)分量M0和补偿线性矢量偶极C三部分,其中纯剪切(双力偶)分量M0占主要部分,表明地震的震源破裂过程以剪切破裂为主。从余震震源机制解可知,NW—NWW方位的节面占主导,结合余震分布尺度可以
Based on the principles of optics and radiometry, the imaging mathematical model is established and the factors of the contrast (signal-noise-ratio) of high-temperature target and the scenery are give
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Adaptive optics (AO) technique has been extensively used for large ground-based optical telescopes to overcome the effect of atmospheric turbulence. But the correction is often partial. An iterative b
An improved block-matching algorithm for fast motion estimation is proposed. The matching criterion is the sum of absolute difference. The basic idea is to obtain the best estimation of motion vectors
由于受CCD相机、中子散射及控制电路等因素的影响,数字中子照相系统所获图像常被噪音污染,抑制噪音对于提高数字中子照相系统图像质量具有重要意义·利用多尺度几何分析能捕获图像几何结构的特性,提出一种新颖的基于contourlet变换的图像去噪方法·通过计算方差一致性测度(VHM) ,确定局部自适应窗口,从而最优估计contourlet系数的阈值萎缩因子,对contourlet系数进行萎缩,实现降噪功能
In this article we introduce an exact backprojection filtered (BPF) type reconstruction algorithm for cone-beam scans based on Zou and Pan’s work. The algorithm can reconstruct images using only the p
In practice, retraining a trained classifier is necessary when novel data become available. This paper adopts an incremental learning procedure to adaptively train a Kernel-based Nonlinear Representor