| 用离散傅里叶变换研究二维抽样的谱分布 |
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| 引用本文： | 王旭光.用离散傅里叶变换研究二维抽样的谱分布[J].南京邮电大学学报(自然科学版),1995(3). |
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| 作者姓名： | 王旭光 |
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| 作者单位： | 南京邮电学院计算机通信工程系 |
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| 摘 要： | 利用离散傅里叶变换（ＤＦＴ）研究了时域中二维任意抽样的谱分布。通过构造一个二维有限区域序列，并对这一序列进行离散傅里叶变换，就能够分析不同抽样方式的谱分布，这种方法简单、直观，且具有普遍性，还提出了广义狄拉克场概念，并对经典的二维抽样定理进行了推广。
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| 关 键 词： | 图像处理，二维抽样，谱分布，离散傅里叶变换，有限区域序列 |
An Analysis of the Spectrum of Sampled Two-Dimensional Signals by Discrete Fourier Transform |
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| Wang Xuguang.An Analysis of the Spectrum of Sampled Two-Dimensional Signals by Discrete Fourier Transform[J].Journal of Nanjing University of Posts and Telecommunications,1995(3). |
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| Authors: | Wang Xuguang |
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| Abstract: | The spectral distribution of arbitrary sampled two-dimensional analog signals in time domain is analysed by using Discrete Fourier Transform. By constructing a two-dimensional finite extent sequences and computing its Discrete Fourier Transform, the two-dimensional spectrum of sampled singnals with different sampling geometries has been analysed. The concept of general unit impuls field function is presented and the generalization of classical two-dimensional sampling theorem is given. |
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| Keywords: | image processing two dimensional sampling spectral distribution discrete Fourier transform finite extent sequences |
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