title: calculate distance between camera and different sized objects
body: <p>I have been trying to develop a small object detection system for my college project.
  The main idea is that i have a robot , that can pick one particular &quot;object&quot; from the surroundings, for this purpose i am using only a single camera, with known intrinsic parameters.
  I have already developed an object detection system, which can predict bounding box coordinates,
  using these coordinates and size of bounding boxes, i am able to predict perceived depth, using &quot;Triangle similarity&quot; method,
  The problem that i am facing is , this particular &quot;object&quot; can vary in size, which means the objects located at the same distance can also have different sized bounding boxes.</p>
  <p>What could be the other way to detect rough estimate from camera to object, given an object doesn't have a fixed size.</p>