Secondly, the method of region feature extraction and optimal feature selection are studied based on PCA, and the effective features are constructed for the target by the analysis of the PCA.

其次，本文研究了区域形状特征提取及基于PCA的特征选择方法，通过对区域特征进行优化选择，构造准确描述目标特性且维数较低的特征。

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We separate the whole image analysis work to several steps: the extraction of pulmonary parenchyma, the segmentation of region of interests (ROI), the feature extraction and classification.

我们将肺结节的自动检测分为肺实质的提取、感兴趣区域(R OI)的分割和ROI特征参数提取及分类判别几个步骤。

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