Line extraction should try to link those lines fragmented by noise, and avoid over-link in the mean time, in order to get features that reflect correctly characters of image events.
直线提取需要尽量将那些因噪声影响而断裂的直线连接起来，同时，还要尽量避免过度连接，才能形成正确反映图像事件实质的特征。
The first part is about the features extraction, including the estimation of source level of the ship-radiated noise and the line extraction of the rotation frequency of propeller noise spectrum.
首先是舰船辐射噪声特征量的提取，包括舰船总声源级的估计和螺旋桨轴频线谱的提取。
Extraction of features is critical to improve the recognition rate of off-line handwritten characters.
要提高脱机手写字符识别的识别率，关键是特征的提取。
Extraction of features is critical to improve the recognition rate of off-line handwritten characters.
要提高脱机手写字符识别的识别率，关键是特征的提取。
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