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图象的采样是数字图象处理系统中的第一个环节。本文给出了确定象场中方阵采样和六角形采样的数学模型,进而分析了采样后二维数字图象的频谱结构,给出了二维数字图象的重建条件。本文还给出了对电视图象进行三维采样的数学模型,分析了电视图象信号采样后的频谱变化,给出了三维数字图象空间谱的图象重建条件。
Image sampling is the first step in a digital image processing system. In this paper, the mathematical model of square matrix sampling and hexagonal sampling in the image field is given. Then the spectral structure of the sampled two-dimensional digital image is analyzed and the reconstruction condition of the two-dimensional digital image is given. This paper also presents a mathematical model for three-dimensional sampling of television images, analyzes the spectral changes after sampling the television image signals, and presents the image reconstruction conditions of the three-dimensional digital image space spectrum.