Firstly, the image is projected on to the orthogonal basis of SVDQ, then the projection coefficient vector is used as algebraic feature of image and applied to recognition.

该方法将图像投影到SVDQ的各个正交基上，得到投影系数向量。将此向量作为图像的代数特征并用于彩色图像识别中。

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Using the support vector machine applied in the high altitude unmanned scout distinguishing image goal of remote sensing, and draw to carry out thorough research for feature value.

将支持向量机应用于高空无人侦察机的遥感图像目标识别，并且对特征值的提取进行深入研究。

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By using calibrated image, it can measure plane absolute displacement of worktable automatically via feature point extraction and gray vector matching.

该方法采用事先通过标定的图像，对自然标志(特征点)的提取和基于灰度向量匹配来完成绝对位移的测量。

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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