| 基于隐含多项式曲线仿射不变量的目标识别 |
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| 引用本文： | 王洪洋,廖桂生,吴云韬. 基于隐含多项式曲线仿射不变量的目标识别[J]. 电子学报, 2004, 32(12): 1978-1981 |
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| 作者姓名： | 王洪洋 廖桂生 吴云韬 |
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| 作者单位： | 1. 南京财经大学电子商务重点实验室,江苏南京 210003;2. 中国科学技术大学计算机科学与技术系,安徽合肥 230027 |
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| 基金项目： | 国家自然科学基金，教育部科学技术研究项目 |
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| 摘 要： | 目标物体的识别和匹配在计算机视觉、图像视频压缩与传输中都有重要应用.由于隐含多项式曲线对物体有良好的描述能力,因而用它识别和匹配目标物体是比较有效的.文章首先证明了隐含多项式曲线封闭有界的充要条件定理,接着基于隐含多项式曲线的二次分解性质,给出了目标物体仿射几何不变量的计算方法.实验证明这种基于首二次因子积的仿射几何不变量准确的描述了物体的特征,从而能较好的设别出复杂的,甚至缺失部分信息的目标物体.
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| 关 键 词： | 隐含多项式曲线 仿射几何不变量 目标识别 计算机视觉 |
| 文章编号： | 0372-2112(2004)12-1978-04 |
| 收稿时间： | 2003-11-16 |
Frequency Estimation with Sub-Nyquist Sampling |
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| WANG Hong-yang,LIAO Gui-sheng,WU Yun-tao. Frequency Estimation with Sub-Nyquist Sampling[J]. Acta Electronica Sinica, 2004, 32(12): 1978-1981 |
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| Authors: | WANG Hong-yang LIAO Gui-sheng WU Yun-tao |
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| Affiliation: | 1. Key Lab of Electronic Business,Nanjing University of Economic,Nanjing,Jiangsu 210003,China;2. Department of Computer Science and Technology,University of Science & Technology of China,Hefei,Anhui 230027,China |
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| Abstract: | Based on an auxiliary time-delay channel and ESPRIT approach,a new algorithm for wide band frequency estimation with sub-Nyquist sampling was proposed.The frequency aliasing due to sub-Nyquist sampling can be resolved by the proposed frequency aliasing resolving algorithm and information from the time-delay channel.To further reduce the complexity of the proposed method,a simplified algorithm with little performance degradation was also given in this paper.At last,simulation results verify the efficiency of the proposed method. |
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| Keywords: | wide band sub-Nyquist sampling frequency aliasing simplified algorithm |
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