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。
Face contour extraction is a significant precondition of facial image analysis such as facial features detection and face recognition.
人脸轮廓提取是人脸特征检测和人脸识别等人脸图像分析的重要前提。
The key technique include skin color detection, skin texture analysis, object area segmentation, image features extraction and the design of classifier.
肤色检测、皮肤的纹理分析检测、目标区域的分割、图像特征的提取、分类器的设计。
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