If its via parallax, then it depends.
So its really hard to determine if something is really small, close and moving slowly against something really big far away and moving quickly. There needs to be some sort of reference frame without that then yup most definitely, ur screwed
Ie eg the moon vs the sun one is clearly bigger than the other but the other is so much further away. Which is why we get eclipses
Are you talking about measuring using the camera? If so, that’s using built-in LIDAR sensor some of the models have. A LIDAR sensor is like radar/sonar but using light, so the phone knows how far away something is with a decent degree of accuracy.
Now, many years ago there were camera measurement apps, but I believe you had to input how far away you were from the object and it only worked on objects that were a somewhat constant distance away from you (parallel planes, so it could tell you the height of a piece of wood standing up but not laying down), then using the known camera’s FOV, you just use trigonometry to figure out distance.
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