The results indicate this method can effectively extract texture feature of gray image target, and has robust to noise and change of target shape.

结果表明，这种特征提取方法能有效地提取灰度图像目标纹理特征，并且对噪音和形状的变化具有强鲁棒性。

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This paper examines the research situation on face image detection and recognition and designs a facial feature automatic extract system.

对人脸图像检测与识别技术的研究现状进行简要论述，并自行设计一个人脸特征自动提取系统。

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The techniques of image tracing, encoding and spread and contract are used to extract the essential picture feature for recognition.

文中还应用了图象跟踪、编码及扩展和收缩等技术，抽取出识别所必需的图象特征。

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Today's facial-recognition systems use a camera to zoom in on an individual's eyes, mouth and nose, and extract a "feature vector, " a set of numbers that describes key aspects of the image, such as the precise distance between the eyes. (Remember, in the end, digital images are just numbers.) Those numbers can be fed back into a large database of faces in search of a match.

WSJ: Eric Schmidt and Jared Cohen: The Dark Side of the Digital Revolution