共查询到19条相似文献,搜索用时 156 毫秒
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针对传统降噪算法损伤高信噪比(SNR)信号而造成信号识别准确率下降的问题,该文提出基于卷积神经网络的信噪比分类算法,该算法利用卷积神经网络对信号进行特征提取,用固定K均值(FK-means)算法对提取的特征进行聚类处理,准确分类高低信噪比信号。低信噪比信号采用改进的中值滤波算法降噪,改进的中值滤波算法在传统中值滤波的基础上增加了前后采样窗口的关联性机制,来改善传统中值滤波算法处理连续噪声效果不佳的问题。为充分提取信号的空间特征和时间特征,该文提出卷积神经网络和长短时记忆网络并联的卷积长短时(P-CL)网络,利用卷积神经网络和长短时记忆网络分别提取信号的空间特征与时间特征,并进行特征融合与分类。实验表明,该文提出的调制信号分类模型识别准确率为91%,相比于卷积长短时(CNN-LSTM)网络提高了6%。 相似文献
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基于噪声分离和小波阈值自适应图像去噪算法 总被引:1,自引:0,他引:1
针对VisuShrink小波阈值滤波算法的不足和混合噪声的情况,提出了一种基于噪声分离和尺度的自适应混合图像去噪算法.算法首先通过极值检测分离脉冲噪声和高斯噪声,然后分别对脉冲噪声应用多窗口中值滤波及高斯噪声应用基于尺度的小波阈值滤波完成去噪.实验表明,该混合滤波算法能有效去除图像中的脉冲噪声和高斯噪声,并较好地保存了... 相似文献
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针对带有高斯噪声和椒盐噪声两种混合噪声的红外图像,提出了一种自适应加权混合去噪算法。该算法首先通过邻域像素的灰度差值来判断像素噪声的类别,然后对高斯噪声采用自适应加权均值滤波法滤除,对椒盐噪声采用自适应加权中值滤波算法滤除。实验表明,该方法优于传统均值滤波算法和中值滤波算法,能同时消除混合噪声,并具有较好的保护图像细节的能力。 相似文献
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Traditional polynomial filtering theory, based on linear combinations of polynomial terms, is able to approximate important classes of nonlinear systems. The linear combination of polynomial terms, however, yields poor performance in environments characterized by Gaussian and heavy tailed distributions. Weighted median and weighted myriad filters, in contrast, are well known for their outlier suppression and detail preservation properties. It is shown here that the weighted median and weighted myriad methodologies are naturally extended to the polynomial sample case, yielding hybrid filter structures that exploits the higher-order statistics of the observed samples while simultaneously being robust to outliers for both Gaussian and heavy-tailed distributions environments. Moreover, the introduced hybrid polynomial filter classes are well motivated by analysis of cross and square term statistics of Gaussian and heavy-tailed distributions. A presented asymptotic tail mass analysis shows that polynomial terms, both under Gaussian and heavy-tailed noise statistics, have heavier tails than the observed samples, indicating that robust combination methods should be utilized to avoid undue influence of outliers. Further analysis shows weighted median processing of polynomial terms for the Gaussian noise case, and weighted median and weighted myriad processing of cross and square terms, respectively, for the heavy-tailed noise case, are justified from a maximum likelihood perspective. Filters parameter optimization procedures are also presented. Finally, the effectiveness of hybrid filters is demonstrated through simulations that include temporal, spectrum, and bispectrum analysis 相似文献
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在有重尾的过程噪声和量测噪声的影响下,高斯混合势均衡多目标多伯努利滤波器(GM-CBMeMBer)的滤波性能会明显下降。针对上述问题,该文提出一种新的学生 t 混合势均衡多目标多伯努利滤波器(STM-CBMeMBer)。该滤波器将过程噪声和量测噪声近似为学生 t 分布,并用学生 t 混合模型来近似多目标的先验强度。从理论上推导出学生 t 混合形式的预测强度和后验强度,建立了势均衡多目标多伯努利滤波器的闭式递推框架。仿真结果表明,在重尾的过程噪声和量测噪声存在的环境中,该滤波器能有效抑制其干扰,相比于传统方法,具有更高的跟踪精度。 相似文献
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基于中值滤波的红外焦平面阵列非均匀性神经网络校正 总被引:1,自引:0,他引:1
统的神经网络校正算法存在收敛速度慢和校正精度低的缺点。当背景噪声较大时,它更难以获得令人满意的校正效果。
针对其不足之处,
提出一种基于中值滤波的红外焦平面阵列(IRFPA)非均匀性神经网络校正算法。该算法首先利用中值滤波对强噪声进行预处理,在此基础上
采用改进的神经网络校正算法对IRFPA非均匀性进行自适应校正。实验结果表明,该算法与传统的神经网络方法相比具有收敛速度快和校正精
度高等特点,并且使图像的峰值信噪比至少提高了10dB。 相似文献
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激光雷达距离像噪声抑制及方法评价 总被引:3,自引:2,他引:1
针对激光成像雷达距离像距离反常噪声的噪声抑 制问题,提出了一种改进环圈滤波(IDF)算法并进行了评价。首先,根据 激光雷达距离像噪声的构成,建立了一般化的距离像噪声仿真模型,模型中包含了地面、目 标和细小结构等成分,可模拟 距离反常、失落信息和内部噪声等噪声干扰;其次,提出了一种IDF噪声抑制算法的一般形 式,利用仿真模型对中 值滤波(MF)、IDF等噪声抑制算法进行了分析,对计算结果从整体、非异常 值和细小结构等多个方面, 评价了算法的噪声抑制能力和保护目标细节信息能力;最后,采用实测距离像对算法进行了 验证。研究结果表明,利用建立 的距离像噪声仿真模型,可以有效地评价不同噪声抑制算法的 能力;同时,利用IDF可 以根据目标特性选取校正系数,在满足算法对保护目标细节信息能力要求的前提下,提高噪 声抑制能力。 相似文献
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Robust adaptive estimator for filtering noise in images 总被引:1,自引:0,他引:1
Provides three new methods for storing images corrupted by additive noise. One is the adaptive mean median filter for preserving the details of images when restored from additive Gaussian noise. Another is the minimum-maximum method for moving outlier noise. The third method, the robust adaptive mean p-median filter, is based on a combination of the previous two methods. In the past, proposed restoration methods have generally proven to be inadequate for both detail preservation and noise suppression, but the new adaptive mean p-median filter is shown to be good at both of these tasks, while the robust adaptive mean p-median filter can give good performance even in the presence of outliers. Degraded images are processed by the proposed algorithms, with the results compared with a selection of other median-based algorithms that have been proposed in the literature. 相似文献
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Traditionally, linear filters have been used to smooth time series of gas path measurements before performing fault detection and isolation. However, linear filters can smooth out sharp trend shifts in the signal and are also not good at removing outliers. Since most fault detection and isolation algorithms are optimized for Gaussian noise, they can show performance degradation when outliers are present. In this study, numerical results with simulated data for engine deterioration and abrupt fault show that the nonlinear rational filter with median preprocessor are useful for gas turbine health monitoring applications resulting in noise reduction of 73%-96% while preserving signal features and removing outliers. 相似文献