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Given the camera matrix, can I find the focal length of this camera ?

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Depends on what form the camera matrix is in.
Typically it is a 3x3 matrix that contains the focal lengths along the diagonal - with different Fx and Fy axis focal lengths to measure the astigmatism of the lens (the third value Fz isn't used)

See http://opencv.willowgarage.com/documentation/camera_calibration_and_3d_reconstruction.html

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