well the app I’m building is needing to have your iphone or android first detect the object I want with known physical size, draw a bouncing box around it, and then use the detected object’s size and or pixel ratio as a reference to measure different objects in the same frame as it. Like using a card of known size 1 inch by 1 inch taking up 365x365 pixels to measure the length of a pencil next to it. My first idea was to see how many pixels were taken up by the size of the reference object while it is between 1 and 2 feet away from the camera, and use that to have people be able to measure whatever they want