title: How to find out focal length of camera in ios and what is the sensor height?
body: <p>I had searched every where for finding focal length of the camera and its back sensor height.
  But I didn't get any specific detail.</p>
  
  <p>I am developing one app which will calculate the actual height of an real world object from the height visible in the image captured from an ios camera.</p>
  
  <p>distance to object (mm) = </p>
  
  <p>focal length (mm) * real height of the object (mm) * image height (pixels)  ---------------------------------------------------------------------------<br>
               object height (pixels) * sensor height (mm)</p>
  
  <p>here I am having the values distance to object as static, image height in pixel. Now I need focal length and sensor height to find out the real object height.</p>
  
  <p>Thanks in advance.
  bskania</p>