I extracted the camera calibration matrix using OpenCV and you need to translate the focal length in mm. It seems that the easiest way to do this is calibrationMatrixValues () . To do this, I need to put apertureWidth and apertureHeight, which are actually the width and height of the physical sensor. I took all my photos with the built-in FaceTime HD camera for Mid-2011 27 "iMac . I couldn’t find any camera specifications. While I asked Apple Stackexchange for the exact sensor size, is there any way to move forward with any good grades?
If your camera can save jpg images, try to see the EXIF header if it contains what you are looking for and make sure that it provides the exact value.