How to find sx and sy and F intrinsix matrix in camera calibration

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As Zanky
As Zanky 2016-5-20
I would like to ask about my problem. I has been doing measurement about camera calibration and i have problem how to find sx and sy value ? sx and sy value will i do to find F (Focal length) in world units. i has searched in parameter camera but i didn't found it. this is i'm doing for to know the effect of variations of the camera-object distance with focal length. please help me, thanks so much.
"The coordinates [cx cy] represent the optical center (the principal point), in pixels. When the x and y axis are exactly perpendicular, the skew parameter, s, equals 0.
fx = F*sx fy = F*sy F, is the focal length in world units, typically expressed in millimeters. [sx, sy] are the number of pixels per world unit in the x and y direction respectively. fx and fy are expressed in pixels."

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