针对SAR图像中的舰船目标和杂波虚警的鉴别问题,采用Gabor变换和核主成分分析(Kernel Principal Component Analysis,KPCA)相结合的舰船目标鉴别算法。首先对SAR图像中的样本切片进行Gabor变换,获得舰船的纹理特征,将这些特征用KPCA算...针对SAR图像中的舰船目标和杂波虚警的鉴别问题,采用Gabor变换和核主成分分析(Kernel Principal Component Analysis,KPCA)相结合的舰船目标鉴别算法。首先对SAR图像中的样本切片进行Gabor变换,获得舰船的纹理特征,将这些特征用KPCA算法降维并提取目标的主成分分量,把最终采集的样本特征通过k-近邻分类器进行训练和测试。通过仿真结果的比较表明,利用Gabor变换和KPCA降维相结合的方法可以有效地对SAR图像中的舰船目标和杂波虚警进行鉴别。展开更多
Improved local tangent space alignment (ILTSA) is a recent nonlinear dimensionality reduction method which can efficiently recover the geometrical structure of sparse or non-uniformly distributed data manifold. In thi...Improved local tangent space alignment (ILTSA) is a recent nonlinear dimensionality reduction method which can efficiently recover the geometrical structure of sparse or non-uniformly distributed data manifold. In this paper, based on combination of modified maximum margin criterion and ILTSA, a novel feature extraction method named orthogonal discriminant improved local tangent space alignment (ODILTSA) is proposed. ODILTSA can preserve local geometry structure and maximize the margin between different classes simultaneously. Based on ODILTSA, a novel face recognition method which combines augmented complex wavelet features and original image features is developed. Experimental results on Yale, AR and PIE face databases demonstrate the effectiveness of ODILTSA and the feature fusion method.展开更多
文摘针对SAR图像中的舰船目标和杂波虚警的鉴别问题,采用Gabor变换和核主成分分析(Kernel Principal Component Analysis,KPCA)相结合的舰船目标鉴别算法。首先对SAR图像中的样本切片进行Gabor变换,获得舰船的纹理特征,将这些特征用KPCA算法降维并提取目标的主成分分量,把最终采集的样本特征通过k-近邻分类器进行训练和测试。通过仿真结果的比较表明,利用Gabor变换和KPCA降维相结合的方法可以有效地对SAR图像中的舰船目标和杂波虚警进行鉴别。
基金the National Natural Science Foundation of China(No.61004088)the Key Basic Research Foundation of Shanghai Municipal Science and Technology Commission(No.09JC1408000)
文摘Improved local tangent space alignment (ILTSA) is a recent nonlinear dimensionality reduction method which can efficiently recover the geometrical structure of sparse or non-uniformly distributed data manifold. In this paper, based on combination of modified maximum margin criterion and ILTSA, a novel feature extraction method named orthogonal discriminant improved local tangent space alignment (ODILTSA) is proposed. ODILTSA can preserve local geometry structure and maximize the margin between different classes simultaneously. Based on ODILTSA, a novel face recognition method which combines augmented complex wavelet features and original image features is developed. Experimental results on Yale, AR and PIE face databases demonstrate the effectiveness of ODILTSA and the feature fusion method.
