How to get the camera scale factor
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I want to obtain the scale factor by calibration, so as to obtain the relationship between the length of the object in the image and the actual length.
However, when I complete the calibration, I can get the intrinsic and extrinsic parameters, but it seems that I still lack some information (distance between the sensor plane and lens center) to get the scale factor.
Please also provide suggestions from professionals in this area, thank you.
Camera Calibration Toolbox for Matlab: http://www.vision.caltech.edu/bouguetj/calib_doc/htmls/example.html
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