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How can use principal component Analysis to extract feature from image that is been acquired by the camera?

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    $\begingroup$ There are some applications where PCA used, like Face Recognition.Your question is too broad. Which type of features you mean? Please be SPECIFIC. $\endgroup$ – MimSaad Apr 18 '17 at 17:37
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PCA is mostly used to reduce the dimensionality of the features.

You should first use a feature detector before you can use PCA to reduce the dimensions of these features. Common feature detectors are SIFT, SURF, ORB etc. Some of them are even available in OpenCV.

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