While it's possible to capture a whiteboard drawing digitally, it's generally an expensive operation, and the resulting datum is clumsy to transmit, version, archive, validate, and transform.

虽然以数字化的方式获取白板上的绘图是可能的。但这么做的代价通常很昂贵，并且所产生的数据难于发送、控制版本、归档、验证、转换。

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Firstly, CCD and image collecting board are used to transform the optical images of the excursion of subsidiary image into the datum patterns recognizable by computers.

首先用CCD和图像采集卡将副像偏移的光学图像转换为计算机能识别的数据模式，然后利用图像处理程序求出副像偏移的值。

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The technique of NBI suppression based on the DFT transform domain is studied, the loss of SNR produced by adding window to input datum is analyzed.

研究了基于DFT变换的变换域窄带干扰抑制技术，分析了加窗引入的信噪比损失。

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