Recent content by RetroQu

That's a shame, I'd hoped the way speed was compensated for could have been the source of the problem. Every calculation I check seems to be ok, but in practice the numbers just aren't adding up as they should. I've been working on this for weeks and can't seem to isolate any problem besides the...

I'm not sure what you mean. The images are taken from above, with the y-axis being in the airplane's line of flight. The bird movement perpendicular to the plane is assumed to be parallax free. Is that a bad assumption, could it be causing the problem?

The exact equations used for bird speed are: av_dir = av_dir/sqrt(sum(av_dir.^2)); P = Gr_int(2); bird_side = bird_int(1) - Gr_int(1); bird_forward = bird_side*av_dir(2)/av_dir(1); bird_parallax = bird_int(2) - bird_forward; height = plane_height*(bird_parallax/(P + bird_parallax)); Where Gr_int...

"h" is the bird height, "H" is the plane height, "P" is the absolute parallax, the translation of a point on the ground between two frames, and "dP" is the bird parallax, how much the bird appears to move between frames (or specifically, the average translation of its head and tail). Of course...

Sorry, I'm getting heights largely between about 200-250m, but I'd expect them to be between about 0-50m, so it seems like something is just systematically shifting heights up. I'm try to fix a flaw in a program someone else made, and I think they got the height equation wrong. They used the...

I'm trying to calculate the heights of birds from a plane flying at a known altitude above them using the parallax effect. They're being recorded from the plane and the head and tail end coordinates marked on each frame they appear. The equation I'm using is from here...