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How to measure the distance from CAMERA and the object

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Hi all, i need to measure the distance between the pi camera module and the object , i've found this formula distance to object (mm) = focal length (mm) * real height of the object (mm) * image height (pixels) -------------------------------------------------------------------------------- object height (pixels) * sensor height (mm) but i"m wondering opencv doesn"t implement a function to do this measure ?? thanks :)

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