Regarding the characteristic of X-ray detection images of carbon material, flaw feature extraction and selection techniques are studied.
针对炭素制品X射线检测图像的特点，对缺陷及其特征提取与选择技术进行了研究。
Defect feature extraction and selection techniques were studied regarding the characteristics of X-ray detection images of carbon product.
针对炭素制品X射线检测图像的特点，对缺陷特征提取与选择技术进行了研究。
The techniques of feature extraction, feature selection and design of classifier for passive sonar target recognition are reviewed.
文章对被动声纳目标识别的特征提取、特征选择和分类器设计方面进行了回顾。
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