共查询到19条相似文献,搜索用时 140 毫秒
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基于组合矩的激光成像雷达目标识别算法 总被引:2,自引:0,他引:2
随着激光技术的发展,激光成像雷达在现代战争复杂战场环境中逐渐获得了广泛的应用,目前激光成像雷达自动目标识别技术已成为国内外研究的热点问题。提出了基于组合矩的激光成像雷达目标识别算法,从激光成像雷达目标的距离像中提取低阶的Zernike矩、Hu矩和中心矩构成组合矩特征,该特征对距离像噪声不敏感,应用径向基函数(RBF)神经网络对三种地面目标进行分类识别。实验结果表明,该算法与应用Zernike矩和Hu矩特征进行分类识别相比,对三种激光成像雷达地面目标的平均识别率在高载噪比(20dB)下分别提高了1.0%和3.7%;在低载噪比(10dB)下分别提高了11.8%和42.5%;当载噪比高于17dB时,该算法的平均识别率达到100%。因此该算法取得了比较好的识别效果。 相似文献
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本文利用不变矩具有平移、旋转和尺度不变性的特点,将其应用于图像识别.提取图像的七个不变矩,然后利用改进的神经网络(BP)进行了图像目标识别算法研究,结果表明此算法具有较好的识别效果,并且速度较快,可以应用于图像小目标的识别当中. 相似文献
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基于PNN的退化交通标志图像的识别算法研究 总被引:5,自引:0,他引:5
为了识别退化的交通标志图像,该文采用一种新的特征提取算法。该算法在处理图像退化问题时,采用模糊-仿射联合不变矩直接提取图像的特征,从而避免了需要较大计算量的图像复原处理过程。针对各阶模糊-仿射联合不变矩数量级差异较大问题,提出一种数量级标准化算法。在深入分析PNN与K-means聚类算法的基础上,提出采用全局K-均值算法优化设计概率神经网络分类器,并将其用于交通标志图像的分类识别。仿真结果表明:模糊-仿射联合不变矩是一种有效的处理退化交通标志图像的方法,所设计的概率神经网络分类器不仅具有精简的结构而且具有较好的推广性能。 相似文献
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Image analysis by Krawtchouk moments 总被引:19,自引:0,他引:19
A new set of orthogonal moments based on the discrete classical Krawtchouk polynomials is introduced. The Krawtchouk polynomials are scaled to ensure numerical stability, thus creating a set of weighted Krawtchouk polynomials. The set of proposed Krawtchouk moments is then derived from the weighted Krawtchouk polynomials. The orthogonality of the proposed moments ensures minimal information redundancy. No numerical approximation is involved in deriving the moments, since the weighted Krawtchouk polynomials are discrete. These properties make the Krawtchouk moments well suited as pattern features in the analysis of two-dimensional images. It is shown that the Krawtchouk moments can be employed to extract local features of an image, unlike other orthogonal moments, which generally capture the global features. The computational aspects of the moments using the recursive and symmetry properties are discussed. The theoretical framework is validated by an experiment on image reconstruction using Krawtchouk moments and the results are compared to that of Zernike, pseudo-Zernike, Legendre, and Tchebyscheff moments. Krawtchouk moment invariants are constructed using a linear combination of geometric moment invariants; an object recognition experiment shows Krawtchouk moment invariants perform significantly better than Hu's moment invariants in both noise-free and noisy conditions. 相似文献
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Bo Yang 《Signal processing》2011,91(10):2290-2303
Orthogonal moments are powerful tools in pattern recognition and image processing applications. In this paper, the Gaussian-Hermite moments based on a set of orthonormal weighted Hermite polynomials are extensively studied. The rotation and translation invariants of Gaussian-Hermite moments are derived algebraically. It is proved that the construction forms of geometric moment invariants are valid for building the Gaussian-Hermite moment invariants. The paper also discusses the computational aspects of Gaussian-Hermite moment, including the recurrence relation and symmetrical property. Just as the other orthogonal moments, an image can be easily reconstructed from its Gaussian-Hermite moments thanks to the orthogonality of the basis functions. Some reconstruction tests with binary and gray-level images (without and with noise) were performed and the obtained results show that the reconstruction quality from Gaussian-Hermite moments is better than that from known Legendre, discrete Tchebichef and Krawtchouk moments. This means Gaussian-Hermite moment has higher image representation ability. The peculiarity of image reconstruction algorithm from Gaussian-Hermite moments is also discussed in the paper. The paper offers an example of classification using Gaussian-Hermite moment invariants as pattern feature and the result demonstrates that Gaussian-Hermite moment invariants perform significantly better than Hu's moment invariants under both noise-free and noisy conditions. 相似文献
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研究了在实际应用中影响目标不变矩稳定性的各种因素,包括高斯模糊、有限观测区域和离散化处理等.分析了在这些因素影响下不变矩的变化规律和误差.并对离散条件下不变矩的误差进行了分析.实验证明得出的具有模糊不变的不变矩,能对经过旋转比例变换且模糊的物体进行准确识别.这些研究和分析为不变矩在实际成像识别系统中正确有效地应用提供重要的理论和实验依据. 相似文献