How do I make my own AR sdk?) How does AR technology work in general?

Question

augmented reality

In general, I am generally interested in this topic. I happened to make a couple of applications tied to AR (augmented reality), but I only used third-party sdk. It's fast, convenient, etc. but they remained a black box for me.
But it became really interesting to delve deeply into the technology. I clearly understand that the topic is not simple and will take a lot of time, but it seems to me a worthy candidate for a new hobby)
So the essence of the question is: Where to start? What to read? Look? Etc. etc.
I would love to hear advice from people who have dealt with this issue.

Answer 1

Start by learning OpenCV, it's hard to write your entire library, especially since most sdk use openCV, only with their own modifications.
Then look at the problems of the Angle of view, the readings of the camera sensors, and so on and so forth.
It took me a month to write my sdk from scratch, and this is only a small part of the problem.
Before that, I was only familiar with ar in general terms.
Now I'm just hooking up openCV to move the virtual camera over short distances. Otherwise, no way.