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This is a pretty standard minimum "quality" (better said resolution in pixels between the eyes) needed for a facial recognition system: Ensure that the image contains a frontal view of the face, good lighting, and at least 80 pixels between the eyes. the bare minimum to identify a human face would be 25 to 75 pixels just between the eyes In the ...


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On page 2 of Axis' web page Identification and Recognition there is an estimate of the minimum number of pixels needed for identification, recognition and detection.


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