estimate-focal-length does not work for 4K video about apriltools

[thegoodhen]

...Oh. Right. Of course it does!

I will fix that. That's a bug, which should be easy to fix. The focal length estimation uses vanishing points to estimate the focal length. It extends the sides of the square tag and finds intersection. To combat numerical instabilities, when the intersection is "too far away," it gives up, assuming that the sides are parallel. But the value for "too far away" was determined empirically on a fullHD footage. It should scale with the frame size, which it doesn't (such a dumb oversight :D) .

[thegoodhen]

It should be fixed. Can you please confirm it?

[i124q2n8]

Now i don't even get results with the down scaled version. I am going to look into this later.

[thegoodhen]

Damnit. That makes no sense.
Well, at least it changed, so the problem is somewhere close.

[thegoodhen]

Aha! I think I know. Is the tag small, or viewed mostly from the front?

[thegoodhen]

@MAP94 poke

[fvlasie]

It is working for me with 4K footage!

Many thanks!