The transition from the rectangular waveguide to the cavity coupler in LINACis made by means of a matching iris, which leads to amplitude and phase asym-metries of fields in the cavity coupler.

电子直线加速器的腔式耦合器通过侧面匹配膜片和方波导相连，它引起了腔中场振幅和相位的不对称。

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A personal identification system based on iris patterns is composed of iris image acquisition, image preprocessing, feature extraction and coding, matching and recognition.

基于虹膜的识别系统由以下几个部分构成：虹膜获取、虹膜图像预处理、虹膜图像特征提取、匹配与识别。

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To overcome the deficiencies of the existing recognition algorithms, this thesis has studied the iris image preprocessing and the feature matching.

本文针对现存的虹膜识别算法中的不足之处，对虹膜识别系统中的图像预处理过程和特征匹配过程进行了深入研究。

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