中文说明：这是关于提取sift特征的代码，里面详细的介绍了sift特征提取的过程，还包含代码注释
English Description：
This is about the SIFT feature extraction code, which describes the SIFT feature extraction process in detail, also contains code comments
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中文说明：这是关于提取sift特征的代码，里面详细的介绍了sift特征提取的过程，还包含代码注释
English Description：
This is about the SIFT feature extraction code, which describes the SIFT feature extraction process in detail, also contains code comments