OpenCV: How-to calculate distance between camera and object using image?

Question

I am a newbie in OpenCV. I am working with the following formula to calculate distance:

distance to object (mm) = focal length (mm) * real height of the obje         


        

Answer 1

there is no such function available in opencv to calculate the distance between object and the camera. see this : Finding distance from camera to object of known size

You should know that the parameters depend on the camera and will change if the camera is changed.