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Originally posted by TheMalefactor
But if it were more than a camera shift, rotations or such, then wouldn't we see some objects moving in opposite directions by a big margin?
I only have a minimal knowledge of this stuff, but as I imagine it in my head if I have a thing on a window and stuff in the background and then I rotate down. The thing nearby would go up and everything else would go down. So it seems to me like everything in the image just shifts due to movement in a single axis.
2. The reflection is *not* fixed to the screen, and varies *further* in location as per point 1.
But the dashboard is fixed in place right? So if the light that's making the reflection stays in place, the dashboard stays put, and the window stays in place then it move consistently between shots?
3. The windscreen is curved, which means for the reflection there is a (non-linear) magnification factor in there as well.
I get this. So I saw that we're dealing with a camera with a 35 or 37 mm lens, right? That means to get the reflection to zoom out further it would have to change to what a 10 or 15 mm lens? How much curvature would that require for the window? Wouldn't that then also massively distort the dashboard?...
Originally posted by Phage
reply to post by TheMalefactor
Xtreme's demonstration doesn't provide any actual distance information.
and it seemed like this was meant to explain It compares relative movement of objects caused by movement of the camera. His point was that, since the reflection moves a different amount than the blob, they cannot both be in the same visual plane (the windscreen).
I don't think his conclusion is valid for several reasons:
1) Even though the reflection is caused by the windscreen it is not in the same visual plane as the windscreen so it's relative movement will be less.
2) By layering the two images, it seems that the two images used do not have the same vertical alignment.
In 0433, the camera has rotated counterclockwise relative to 0432. This rotation would skew the positional data.
3) The two images also have differing aim points. 0433 is aimed lower and to the left relative to 0432. This would also cause a difference in movement because the right (and upper) side of the frame would to be closer to the windscreen which would cause objects in that are to translate more.
Originally posted by Phage
reply to post by TheMalefactor
With all the variables I don't know if it is feasible to try to quantify the movement of various elements of the images.
I did not stabilize the "lens flare". As Charlz has pointed out. It remains fixed relative to the background in all the images.
Originally posted by CHRLZ
Phage, thanks for that animation - you spurred me on to investigate that area fully. The half 'hexagon' is not a flare nor reflection, it is simply the way the tree is lit up.
You can very clearly see it in this animation of the 5 images:
[atsimg]http://files.abovetopsecret.com/images/member/dd63b198c857.gif[/atsimg]
Originally posted by TheMalefactor
Originally posted by Phage
reply to post by TheMalefactor
With all the variables I don't know if it is feasible to try to quantify the movement of various elements of the images.
Better to try than not.
Originally posted by RICH-ENGLAND
reply to post by TheMalefactor
i think thats because its the reflection at the bottom on one picture making part of it look lit up but the reflection is higher on the other picture. so basically the bottom bit was never lit up, its just an illusion brought by the reflection. but obviously thats just my opinion.
Originally posted by RICH-ENGLAND
reply to post by TheMalefactor
yes but what im saying is the bottom part was never lit up
Originally posted by TheMalefactor
Originally posted by RICH-ENGLAND
reply to post by TheMalefactor
yes but what im saying is the bottom part was never lit up
Exactly the problem! If it wasn't lit up how could a light shining of a dashboard a couple hundred feet away on to a window, which would make it harder to see the stuff in the background, make the blob in the background more clear? Just doesn't make sense.