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How can I obtain the real focal distance from the stereo camera calibrator app?

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I am trying to obtain the real focal distance of my stereo camera pair, but the stereo camera calibrator app returns F (the real focal length) as a vector comformed by and . At the documentation of the app, it is specified that:
But it does not specify how can I obtain and . I apreciate your help in advance.

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Abhinav Aravindan
Abhinav Aravindan le 28 Mar 2024
I understand that you're interested in calculating the focal length in world units (millimeters) from the intrinsic camera parameters fx and fy. During camera calibration, the focal length is estimated in pixels, independent of the camera dimensions. To compute the focal length in world units, the pixel size on the camera sensor needs to be known, which may be obtained from the manufacturer’s specifications to estimate “sx” andsy, where sx and sy are the number of pixels per world units in the x and y direction respectively.
Similar queries to yours have been answered in the below links:
For further detail, please refer to the documentation links below:

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